R00.0 (Tachycardia, unspecified) is the tachycardia ICD-10 code for a fast heart rate that the provider documents without naming the rhythm. Once the provider names a rhythm, the code moves to category I47: I47.10 for unspecified SVT and I47.20 for unspecified VT.
Rare rhythms cause few of the tachycardia denials we work at One O Seven RCM. Two habits cause most of them. Superbills still carry I47.1, a header code since October 1, 2023, and claims list R00.0 beside an I47 code for the same episode. Payer edits catch both before anyone opens the chart.
You’ll get the most from this guide if you code or bill tachycardia claims for cardiology, primary care, urgent care, or the ED. The codes and dates below follow the FY2027 code set, valid October 1, 2026 through September 30, 2027.
| Key TakeawaysR00.0 fits a fast rate with no rhythm named.I47.1 and I47.2 are non-billable headers. Bill I47.10, I47.11, I47.19, or I47.20 to I47.29.I47.22 (CPVT) is new for dates of service on and after October 1, 2026.Don’t report R00.0 with an I47 code for one episode. Each carries an Excludes1 note against the other.”Rule out SVT” in an office note stays R00.0.Sinus tachycardia NOS stays R00.0. IST codes to I47.11 only when the provider writes “inappropriate sinus tachycardia.”As of October 23, 2026, Novitas lists R00.0 for Holter claims and WPS doesn’t. |
What Is the ICD-10 Code for Tachycardia?
The ICD-10 code for tachycardia is R00.0, Tachycardia, unspecified. It’s a billable ICD-10-CM code valid for dates of service October 1, 2026 through September 30, 2027. Use it when the provider records a fast heart rate but doesn’t name the rhythm or the cause behind it.
R00.0 code card. Source: FY2027 ICD-10-CM Tabular List.
| Field | Value |
|---|---|
| Code | R00.0 |
| Descriptor | Tachycardia, unspecified |
| Billable | Yes |
| Valid for | October 1, 2026 to September 30, 2027 (FY2027) |
| Chapter | 18, Symptoms and signs; category R00, Abnormalities of heart beat |
| Inclusion terms | Rapid heart beat; Sinoauricular tachycardia NOS; Sinus [sinusal] tachycardia NOS |
| Excludes1 | Inappropriate sinus tachycardia, so stated (I47.11); Neonatal tachycardia (P29.11); Paroxysmal tachycardia (I47.-) |
| Category R00 note | Excludes2: specified arrhythmias (I47 to I49) |
| Claim format | R000 on the electronic claim (no decimal) |
For tachycardia ICD-10 coding, Section I.B.4 of the Official Guidelines allows a sign or symptom code when the provider hasn’t confirmed a related definitive diagnosis. Picture an urgent care visit: the patient’s rate is 128, the EKG gets read, and the assessment says “tachycardia, likely dehydration.” In the outpatient setting, that visit codes to R00.0.
What Does Tachycardia, Unspecified Mean on a Claim?
Unspecified means the provider documented a rate above normal without naming a rhythm such as SVT, VT, or atrial fibrillation, and without tying it to a cause. The word describes the note. A patient coded R00.0 today can carry I47.19 next month after an EP study names AVNRT, because each encounter gets the code its own documentation supports.
Other Names for Tachycardia That Still Code to R00.0
The Tabular List gives R00.0 three inclusion terms: rapid heart beat, sinoauricular tachycardia NOS, and sinus [sinusal] tachycardia NOS. NOS means not otherwise specified. A note reading “sinus tach” with no qualifier lands here. Add “inappropriate,” “paroxysmal,” or “neonatal,” and the code changes, as the Excludes1 notes in the card show.
Palpitations are a separate symptom with a separate code, R00.2. Patients often describe both in one visit, and the provider’s assessment decides which code goes on the claim. Neither code excludes the other, so both can appear when both are documented. Our guide to R00.2 palpitations coding walks through that split.
Tachycardia ICD-10 Codes at a Glance (FY2027)
I47.1 (Supraventricular tachycardia) and I47.2 (Ventricular tachycardia) are non-billable subcategory headers. A claim needs a fifth-character code beneath them. The table below lists the tachycardia ICD-10 codes most cardiology, primary care, and ED claims need, with the descriptor wording from the CMS 2027 ICD-10-CM files.
FY2027 tachycardia codes, valid October 1, 2026 to September 30, 2027. Source: CMS 2027 ICD-10-CM files.
| Code | FY2027 descriptor | Billable | Use when the provider documents | Notes |
|---|---|---|---|---|
| R00.0 | Tachycardia, unspecified | Yes | Fast rate, no rhythm named | Excludes1 with I47.- |
| I47 | Paroxysmal tachycardia | No (category) | Not for claims | Code-first note for obstetric cases |
| I47.0 | Re-entry ventricular arrhythmia | Yes | Re-entry ventricular arrhythmia | None |
| I47.1 | Supraventricular tachycardia | No (header since October 1, 2023) | Not for claims | Use I47.10, I47.11, or I47.19 |
| I47.10 | Supraventricular tachycardia, unspecified | Yes | SVT or PSVT, no mechanism named | None |
| I47.11 | Inappropriate sinus tachycardia, so stated | Yes | “Inappropriate sinus tachycardia” or “IST” | Wording must be stated |
| I47.19 | Other supraventricular tachycardia | Yes | AVNRT, AVRT, atrial, junctional, or nodal tachycardia | None |
| I47.2 | Ventricular tachycardia | No (header since October 1, 2022) | Not for claims | Use I47.20 to I47.29 |
| I47.20 | Ventricular tachycardia, unspecified | Yes | VT or NSVT, type not specified | NSVT detail in the VT section |
| I47.21 | Torsades de pointes | Yes | Torsades | Code also I45.81 if applicable |
| I47.22 | Catecholaminergic polymorphic ventricular tachycardia [CPVT] | Yes | CPVT or FPVT | New October 1, 2026 |
| I47.29 | Other ventricular tachycardia | Yes | A specified VT type with no code of its own | None |
| I47.9 | Paroxysmal tachycardia, unspecified | Yes | “Paroxysmal tachycardia,” origin not stated | Includes Bouveret-Hoffmann |
| I49.5 | Sick sinus syndrome | Yes | Tachycardia-bradycardia syndrome | See special cases |
| I45.89 | Other specified conduction disorders | Yes | Nonparoxysmal AV nodal tachycardia | Outside category I47 |
| G90.A | Postural orthostatic tachycardia syndrome [POTS] | Yes | POTS | See special cases |
| P29.11 | Neonatal tachycardia | Yes | Newborn tachycardia | Excludes1 from R00.0 |
| [Image placeholder: tachycardia-icd-10-code-map-fy2027.webp]Alt text: Tachycardia ICD-10 code map for FY2027 showing R00.0, I47.10, I47.11, I47.19, I47.20, I47.21, I47.22, I47.29, I47.9, I49.5, G90.A, and P29.11 |
Symptom codes sit in Chapter 18 (R00 to R99), and diagnosed rhythms sit in Chapter 9, categories I47 to I49. The provider’s wording decides which chapter you’re in. An ED note that says “tachycardic, cause unclear” keeps you in Chapter 18. A cardiology note that says “AVNRT” moves you to I47.19.
Some providers write “tachyarrhythmia” and stop there. For tachyarrhythmia ICD-10 coding, send a query asking for the specific rhythm before you pick R00.0 or an I47 code. The word tells you the rate is fast and the rhythm is abnormal, but it doesn’t tell you which rhythm, and that’s the detail the code depends on.
Diagnosis codes travel with procedure codes on cardiology claims, and a mismatch between the two draws the same denials. Our cardiology CPT codes guide covers the procedure side of the claims in this table.
R00.0 or I47? Five Rules That Decide the Code
Code R00.0 when the provider hasn’t named a rhythm by the end of the encounter. Once the provider names one, code the I47 subcode. Don’t report both for one episode: R00.0 excludes paroxysmal tachycardia (I47.-), and category I47 excludes tachycardia NOS (R00.0). Those are Excludes1 notes, so they can’t sit together.
These five rules settle most tachycardia ICD-10 choices you’ll face. Each one names the guideline section behind it, so you can check the wording yourself before you push back on a provider or a payer.
- Code what’s certain at that visit (Sections I.B.4 and I.B.18). The FY2027 ICD-10-CM Official Guidelines tie the code to each encounter’s documentation. An ED visit for “tachycardia” codes R00.0. If the EP follow-up names AVNRT, that visit codes I47.19, and the ED claim stays as billed.
- The provider’s statement decides (Section I.A.19). A coder’s read of the strip doesn’t set the code. If the tracing looks like SVT but the note says “tachycardia,” query the provider before you change anything.
- Excludes1 cuts both ways (Section I.A.12.a). The guideline allows an exception for two unrelated conditions, and that exception rarely fits a single heartbeat. If you can’t tell whether the fast rate and the named rhythm are one event, ask.
- Uncertain diagnoses depend on the setting. In the office, “rule out SVT,” “probable SVT,” and “suspected SVT” code to the symptom, R00.0 (Section IV.H). Inpatient coders follow Section II.H, which codes an uncertain diagnosis documented at discharge as if it were established.
- Leave out R00.0 when it’s integral to a confirmed condition (Section I.B.5). Tachycardia documented as part of sepsis or fever isn’t coded on its own. A finding that isn’t routinely part of the condition can still be coded (Section I.B.6).
| [Image placeholder: r00-0-vs-i47-decision-tree.webp]Alt text: Decision tree for choosing R00.0 or an I47 tachycardia code based on provider documentation |
Can R00.0 and I47 Be Billed Together?
R00.0 and an I47 code can’t share a claim for one episode. The Excludes1 notes run in both directions, and many payer claim editors flag the pair. If the note opens with “fast heart rate” and the assessment says SVT, the assessment controls, and the claim carries I47.10 alone. Query when the note leaves that link unclear.
How Do You Code “Rule Out SVT” in the Office?
R00.0 is the code, plus any other symptoms the provider documents, such as palpitations or dizziness. The SVT code waits until a later visit confirms it. Billing I47.10 off a rule-out puts an unestablished diagnosis on the patient’s record, and auditors treat that as an error.
When Tachycardia Comes From a Drug
For an adverse effect of a drug taken as prescribed, sequence the tachycardia code first. Then add the T36 to T50 code with a fifth or sixth character of 5. A poisoning, such as an overdose or the wrong drug, flips the order: the T code goes first and the tachycardia follows (Section I.C.19.e).
If your team debates R00.0 versus I47 chart after chart, a cleaner query workflow usually ends the argument. That’s the first piece our cardiology revenue cycle management team sets up with a new practice.
Sinus Tachycardia ICD-10: R00.0 or I47.11?
For sinus tachycardia ICD-10 coding, an unqualified “sinus tachycardia” goes to R00.0, where sinus tachycardia NOS is an inclusion term. Inappropriate sinus tachycardia codes to I47.11, but only when the provider writes that phrase or “IST.” R00.0 carries an Excludes1 note for it, so the two can’t share a claim.
Sinus tachycardia Alphabetic Index paths, FY2027 ICD-10-CM.
| Documented term | Code |
|---|---|
| Sinus tachycardia (NOS) | R00.0 |
| Inappropriate sinus tachycardia, so stated (IST) | I47.11 |
| Paroxysmal sinus tachycardia | I47.19 |
You can confirm each row above in the NCHS ICD-10-CM browser, which hosts the official Index and Tabular files. A few lookup sites list inappropriate sinus tachycardia as an R00.0 synonym. The Tabular excludes it, and the inappropriate sinus tachycardia ICD-10 code is I47.11.
The phrase so stated means the provider’s own words. You can’t assign I47.11 because a sinus rate stays high across three visits with no cause found. That pattern calls for a query, and the query can’t lead. “Please clarify the type of tachycardia documented on October 14, 2026” works. “Is this inappropriate sinus tachycardia?” puts words in the provider’s mouth.
The wording changes the payment picture too. As of October 23, 2026, I47.11 sits on both the Novitas and WPS Holter coverage lists, while R00.0 appears on the Novitas list only. A WPS Holter claim for “sinus tachycardia” with nothing else documented can fail medical necessity, and the MAC section below shows the full table.
Practices that field IST queries weekly tend to do better with specialty-matched cardiology coders who already know how cardiologists phrase these notes. They catch the tachycardia ICD-10 choices that need a query before the claim leaves the building.
SVT ICD-10 Codes: I47.10, I47.11, and I47.19
I47.10, Supraventricular tachycardia, unspecified, is the billable SVT code when the provider names SVT or PSVT but no mechanism. It’s valid October 1, 2026 through September 30, 2027. I47.1 itself has been a non-billable header since October 1, 2023, so it can’t carry a claim.
SVT codes under subcategory I47.1, FY2027 ICD-10-CM.
| Code | Descriptor | Use when the provider documents |
|---|---|---|
| I47.10 | Supraventricular tachycardia, unspecified | SVT or PSVT, no mechanism named |
| I47.11 | Inappropriate sinus tachycardia, so stated | IST in those words (see the sinus tachycardia section) |
| I47.19 | Other supraventricular tachycardia | AVNRT, AVRT, atrial, junctional, or nodal tachycardia; paroxysmal sinus tachycardia |
The mechanism is what moves an SVT ICD-10 code off I47.10. AVNRT on the EP report goes to I47.19. Paroxysmal atrial tachycardia and AVRT land there too. Once the provider names the circuit or the site, the unspecified code stops fitting, even if an earlier visit used it.
Nonparoxysmal AV nodal tachycardia is the outlier. The Index sends it to I45.89, Other specified conduction disorders, outside category I47. Coders who search the code book for “nodal” sometimes grab I47.19 by mistake, and that error survives until an audit finds it.
No supraventricular tachycardia ICD-10 code requires a tracing before you assign it, since the provider’s statement controls under Section I.A.19. Payers and auditors still expect the tracing in the chart. In the office, that tracing often goes out on the same claim as 12-lead EKG code 93000.
PSVT ICD-10: I47.10 or I47.9?
“PSVT” or “paroxysmal SVT” with no mechanism codes to I47.10. A note that says “paroxysmal tachycardia” without naming the origin codes to I47.9, Paroxysmal tachycardia, unspecified. The word supraventricular moves the code from I47.9 to I47.10, so look for that word in the assessment.
Both paths sit under Tachycardia, paroxysmal, in the Alphabetic Index. Notes from the same visit sometimes use both phrases, one in the HPI and one in the assessment. In that case, query which one the provider means before you pick between I47.9 and I47.10.
What to Do With Old I47.1 Entries
A claim carrying I47.1 is invalid for dates of service on or after October 1, 2023. Most clearinghouses reject it before it reaches the payer, and some payers send it back with a diagnosis remark code.
It’s one of the tachycardia ICD-10 rejections we clear most often, and correcting the single claim won’t stop the next one. Fix the superbill or EHR favorite that produced it, and the FY2027 cleanup section below shows how.
Ventricular Tachycardia ICD-10: I47.20 to I47.29 and New I47.22
I47.20, Ventricular tachycardia, unspecified, is the billable code when the provider documents VT without naming a type. It’s valid October 1, 2026 through September 30, 2027. I47.2 itself has been a non-billable header since October 1, 2022, and claims that still carry it fail the same way old I47.1 claims do.
FY2027 ventricular tachycardia codes. Source: CMS 2027 ICD-10-CM files.
| Code | Descriptor | Use when documented | Instructional note |
|---|---|---|---|
| I47.0 | Re-entry ventricular arrhythmia | Re-entry ventricular arrhythmia | None |
| I47.20 | Ventricular tachycardia, unspecified | VT, NSVT, or sustained VT, type not named | None |
| I47.21 | Torsades de pointes | Torsades | Code also long QT syndrome (I45.81) if applicable. Use an additional code for the drug adverse effect (T36 to T50, fifth or sixth character 5) if applicable |
| I47.22 | Catecholaminergic polymorphic ventricular tachycardia [CPVT] | CPVT or familial polymorphic VT [FPVT] | New October 1, 2026 |
| I47.29 | Other ventricular tachycardia | A specified VT type with no code of its own | None |
For NSVT, the ICD-10 for ventricular tachycardia is I47.20. The Index entry treats “sustained” and “nonsustained” as nonessential modifiers, the words in parentheses that don’t change the code. Both lead to I47.20. A specified VT type with no dedicated code is the only documentation that belongs in I47.29.
NSVT codes to I47.20. Several pages that rank for ventricular tachycardia ICD-10 searches send it to I47.29, and the Index doesn’t support that choice.
What Changed for VT on October 1, 2026?
I47.22 gave CPVT its own code on October 1, 2026. Familial polymorphic ventricular tachycardia [FPVT] sits under it as an inclusion term. Before that date, CPVT claims typically went to I47.29, so a template built before that date still points there.
Dates of service on or after October 1, 2026 need I47.22. Update charge templates and EHR favorites for your EP and cardiology providers before the next CPVT follow-up. Hold off on assuming an HCC value for the new code until you’ve checked CMS’s mapping, which the risk adjustment section covers.
Torsades de Pointes: The Two Extra Codes
I47.21 carries two instructional notes. If the provider documents long QT syndrome, the “code also” note adds I45.81. For torsades from a drug taken as prescribed, I47.21 goes first and the T36 to T50 code with a fifth or sixth character of 5 follows. A poisoning reverses that order, with the T code first (Section I.C.19.e).
Monitor claims add a payer layer to the tachycardia ICD-10 choices in this section. As of October 23, 2026, the WPS Holter list doesn’t include I47.21 or I47.22, while the Novitas list includes both.
Does “Intermittent,” “Persistent,” or “Paroxysmal” Change the Code?
R00.0 stays the code for “intermittent,” “persistent,” “exertional,” “mild,” and “transient” tachycardia. None of those words is an Index subterm under Tachycardia, so the main-term default code applies (Section I.A.18). “Paroxysmal” is a subterm, and it moves the code to I47.9 unless the provider names the origin.
How documentation wording changes the tachycardia code. Source: FY2027 ICD-10-CM Alphabetic Index.
| Documented wording | Code | Why |
|---|---|---|
| Intermittent tachycardia | R00.0 | Not a subterm; the default applies |
| Persistent tachycardia | R00.0 | Not a subterm. Don’t confuse it with persistent AFib (I48.19) |
| Exertional tachycardia | R00.0 | Not a subterm. If the provider names CPVT, use I47.22 |
| Mild tachycardia | R00.0 | Severity words don’t change the code |
| Transient tachycardia | R00.0 | Not a subterm; Chapter 18 covers transient findings with no cause found |
| Paroxysmal tachycardia | I47.9 | Index subterm |
| Paroxysmal supraventricular tachycardia | I47.10 | The origin is named |
| Narrow-complex tachycardia | R00.0 as written; query first | Describes the tracing, not a rhythm diagnosis |
| Wide-complex tachycardia | R00.0 as written; query first | Could be VT (I47.20) or SVT with aberrancy (I47.10) |
| Psychogenic tachycardia | F45.8 | Index subterm |
| Psychogenic paroxysmal tachycardia | F54 | Index subterm |
| Nonparoxysmal AV nodal tachycardia | I45.89 | Index subterm, outside I47 |
| “Other tachycardia” | No such code | Ask for the origin: I47.19 for SVT types, I47.29 for VT types |
Coders lose time on these words because they sound clinical enough to matter. For tachycardia ICD-10 purposes, only the words listed as Index subterms change the code. R00.8 covers other abnormalities of heart beat, so it doesn’t work as a stand-in for “other tachycardia” either.
Wide-Complex vs Narrow-Complex Tachycardia ICD-10: Query Before You Code
Neither phrase is an Index subterm. Both describe the QRS width on the tracing, and R00.0 is defensible when that’s all the note says. A query usually gets you a rhythm diagnosis, and that diagnosis can change whether the claim pays.
Keep the query neutral: “Please document the rhythm interpreted on the [date of service] tracing, if known.” As of October 23, 2026, R00.0 isn’t on the WPS Holter coverage list, so the answer matters most on WPS Holter claims.
Tachy-Brady, POTS, Newborns, Pregnancy, and AFib With RVR
Five situations change the usual tachycardia ICD-10 answer. Some move the code out of R00.0 and I47 altogether, and others change the order of the codes on the claim. Each one gets its own rule below.
Tachycardia and Bradycardia: I49.5
Tachycardia-bradycardia syndrome codes to I49.5, Sick sinus syndrome. The Index sends “paroxysmal tachycardia with sinus bradycardia” to the same code. If the provider documents separate fast and slow episodes without naming the syndrome, R00.0 and R00.1 can each apply. A note that says “tachy-brady” without the word syndrome needs a short query.
POTS: G90.A Without R00.0
G90.A, Postural orthostatic tachycardia syndrome [POTS], is billable and has been in the code set since October 1, 2022. The tachycardia is integral to the syndrome, so R00.0 stays off the claim (Section I.B.5). Practices still miscode POTS to R00.0 when the provider names the syndrome but the template defaults to the symptom code.
Newborn Tachycardia: P29.11
R00.0 carries an Excludes1 note for neonatal tachycardia, and category R00 excludes heartbeat abnormalities that originate in the perinatal period. A newborn’s tachycardia codes to P29.11, Neonatal tachycardia, from Chapter 16. If R00.0 shows up on a newborn claim, check whether an adult favorites list got copied into the newborn template.
Tachycardia in Pregnancy ICD-10: Sequencing Comes First
Chapter 15 codes take sequencing priority when a condition complicates the pregnancy (Section I.C.15.a). For a diagnosed rhythm such as SVT, that typically means an O99.41- code for the trimester, followed by the I47 code. If the provider states the pregnancy is incidental to the visit, the tachycardia code goes first and Z33.1, Pregnant state, incidental, follows.
The I47 category also carries a code-first note. Tachycardia complicating abortion, ectopic, or molar pregnancy (O00 to O07, O08.8) or obstetric surgery (O75.4) takes those codes first. Symptom-only R00.0 in pregnancy has less direct guidance, so check the Tabular and your payer’s rules before you build a template around it.
AFib With RVR: Code the AFib Type
RVR, rapid ventricular response, describes how fast the atrial fibrillation drives the ventricles. It doesn’t stand as a separate diagnosis. Code the documented AFib type, such as I48.0, I48.19, I48.21, or I48.91, and leave R00.0 off, since the fast rate is integral to the AFib (Section I.B.5). Our guide to AFib ICD-10 codes by type covers each type.
FY2027 Changes and Superbill Cleanup
Two tachycardia-related changes took effect October 1, 2026. I47.22 (CPVT) became a new billable code, and I49.8 became a non-billable header subdivided into I49.81, I49.82, and I49.89. R00.0 didn’t change, and neither did the SVT codes added on October 1, 2023.
Tachycardia and arrhythmia code changes by effective date. Source: CMS ICD-10-CM files.
| Effective date | Change |
|---|---|
| October 1, 2022 | I47.2 became a header; I47.20 and I47.29 were added |
| October 1, 2023 | I47.1 became a header; I47.10, I47.11, and I47.19 were added |
| October 1, 2026 | I47.22 added. I49.8 became a header, and I49.81 (Brugada syndrome), I49.82 (Ventricular bigeminy), and I49.89 (Other specified cardiac arrhythmias not elsewhere classified) were added |
Code updates don’t touch the templates that feed your claims. A header code saved as an EHR favorite in 2022 keeps landing on claims until your team removes it. In the audits we run, the stale entry tends to sit in a cardiology or urgent care template that hasn’t been opened in years.
- Search charge templates and EHR favorites for I47, I47.1, I47.2, and I49.8.
- Replace each entry with the matching fifth-character code.
- Add I47.22 where cardiology or EP providers see CPVT.
- Re-check your MAC’s coverage lists after each October 1 update.
- Spot-check 10 recent tachycardia claims against the new codes.
If you’d rather not dig through three years of templates yourself, a cardiology coding audit finds the dead codes and shows which paid or denied claims they touched.
Holter and Monitor Claims: Which Tachycardia Codes Each MAC Covers
Coverage depends on your MAC. As of October 23, 2026, Novitas article A59268 lists R00.0, I47.21, and I47.22 for ambulatory ECG monitoring but leaves out I47.10, I47.20, and I47.9. WPS article A57476 reverses that, listing I47.10, I47.20, and I47.9 but not R00.0, I47.21, or I47.22.
Tachycardia codes on MAC ambulatory ECG coverage lists. Novitas A59268, revision R6, effective October 1, 2026. WPS A57476, revision R9, Group 2 (93224 to 93229), effective October 1, 2026. Checked October 23, 2026.
| Code | Novitas A59268 | WPS A57476 |
|---|---|---|
| R00.0 | Listed | Not listed |
| I47.0 | Listed | Listed |
| I47.10 | Not listed | Listed |
| I47.11 | Listed | Listed |
| I47.19 | Listed | Listed |
| I47.20 | Not listed | Listed |
| I47.21 | Listed | Not listed |
| I47.22 | Listed | Not listed |
| I47.29 | Listed | Listed |
| I47.9 | Not listed | Listed |
| I49.5 | Listed | Listed |
Novitas covers jurisdictions JH (AR, CO, LA, MS, NM, OK, and TX) and JL (DE, DC, MD, NJ, and PA). WPS covers J5 (IA, KS, MO, and NE) and J8 (IN and MI). A practice that bills in both regions can see one tachycardia code pay in Texas and deny in Iowa.
Both articles sit on top of NCD 20.15, the national floor. Medicare covers ambulatory ECG monitoring as a diagnostic test when the patient has signs, symptoms, or other clinical indications. Screening isn’t covered. A 24-hour recording is generally adequate, and monitoring beyond 24 hours needs documented medical necessity.
A tachycardia ICD-10 code that’s correct for the chart can still miss the payer’s list. Don’t change a diagnosis to fit a coverage list. If a WPS patient’s note says only “tachycardia,” check whether the provider also documented palpitations (R00.2), dizziness (R42), or syncope (R55). All three are on the WPS list.
If the note has none of them, you’re looking at a documentation conversation with the provider, and coding can’t solve it.
Other MACs publish their own monitoring articles, so pull yours from the Medicare Coverage Database before you reuse either list. Commercial plans set their own diagnosis lists and frequency limits, so check those at scheduling too.
Device rules live on their own pages. Our guide to 93224 Holter billing covers the global Holter code, from recording through interpretation. For loop and event recorders, see 30-day event monitor billing. If billing articles and LCDs still feel tangled, our explainer on how LCDs work sorts out which document controls what.
Coverage lists change each October. We run the MAC list against the planned diagnosis during prior authorization checks at scheduling, so a mismatch surfaces before the patient wears the device.
Which Tachycardia Codes Count for Risk Adjustment (HCC 238)?
Under the CMS-HCC V28 model, HCC 238 (Specified Heart Arrhythmias) picks up I47.0, I47.20, I47.21, I47.29, I47.9, and I49.5 in the payment year 2027 lists we reviewed, along with the AFib and flutter codes. The SVT codes I47.10, I47.11, and I47.19 don’t appear, and neither does R00.0.
Tachycardia codes and V28 HCC 238, payment year 2027. Confirm each row in the CMS 2027 initial ICD-10-CM mappings file before use.
| Code | Maps to V28 HCC 238? |
|---|---|
| R00.0 | No |
| I47.0 | Yes |
| I47.10, I47.11, I47.19 | No |
| I47.20, I47.21, I47.29 | Yes |
| I47.22 | Not shown in the lists we checked |
| I47.9 | Yes |
| I49.5 | Yes |
I47.22 is new for FY2027, so check whether CMS has mapped it. Open the initial mappings file on the CMS 2027 HCC mappings page and confirm each code. Some guides say SVT codes raise RAF scores under V28, and CMS’s file is where you settle that.
CMS pays risk adjustment on specific, supported documentation. A note that says “VT” with the monitor result behind it supports I47.20. Picking a code because it maps to an HCC, with nothing in the chart to back it, is the pattern RADV auditors look for.
Tachycardia Denials and the Documentation That Prevents Them
Most tachycardia denials trace to four problems: a header code on the claim, R00.0 billed next to an I47 code, a diagnosis missing from the MAC’s monitor list, or no documented symptom behind the test. Each one has a fix that starts before the claim goes out.
Common tachycardia coding denials. Adjustment codes vary by payer.
| Problem | Typical result | Fix |
|---|---|---|
| I47, I47.1, I47.2, or I49.8 on the claim | Clearinghouse rejection, or CO-16 with a remark code such as M76 | Replace it with the fifth-character code and fix the template |
| R00.0 and I47 on one claim for one episode | Code-edit denial (CARC varies by payer) | Keep the code the provider’s final statement supports |
| A code missing from the MAC’s monitor list, such as R00.0 at WPS | CO-11 | Check for other documented symptoms; don’t swap codes without documentation |
| No documented symptom, or an order that reads like screening | CO-50 | Appeal only if the chart supports medical necessity |
A CO-11 on a Holter line means the payer didn’t accept that diagnosis for that procedure. Our breakdown of CO-11 diagnosis mismatch walks through the appeal. Header codes that slip past the clearinghouse tend to come back as CO-16, and our guide to CO-16 missing information covers the resubmission.
Screening-style orders draw CO-50. Read the order and the note together before you appeal, since an appeal without a documented symptom rarely gets paid. Our page on CO-50 medical necessity denials explains what reviewers expect to find in the record.
Most of these fixes start upstream, in the provider’s note. This documentation checklist covers the tachycardia ICD-10 details that decide the code:
- The rhythm by name: SVT, AVNRT, VT, or CPVT
- Paroxysmal, sustained, or nonsustained, when known
- The exact phrase “inappropriate sinus tachycardia” when that’s the diagnosis
- The cause or link, if one exists: a drug, fever, sepsis, or POTS
- Whether the pregnancy is affected or incidental
- The tracing or monitor result behind the diagnosis
- “Rule out” wording only while the diagnosis is still unconfirmed
If the same CO-11 keeps coming back on tachycardia lines, the fix usually sits in the template. That’s where our cardiology denial management team starts, before anyone writes another appeal.
Tachycardia ICD-10 FAQs
What Is the ICD-10 Code for Tachycardia, Unspecified?
R00.0, Tachycardia, unspecified, is the ICD-10 code for tachycardia when the provider documents a fast heart rate without naming the rhythm. It’s billable for dates of service October 1, 2026 through September 30, 2027. Once the provider names SVT, VT, or another rhythm, the tachycardia ICD-10 answer moves to an I47 code.
What Is the ICD-10 Code for SVT?
I47.10, Supraventricular tachycardia, unspecified, is the SVT ICD-10 code when the provider names SVT without a mechanism. AVNRT, AVRT, and atrial, junctional, or nodal tachycardia code to I47.19. I47.1 is a non-billable header, so a supraventricular tachycardia ICD-10 claim with a date of service on or after October 1, 2023 can’t carry it.
What Is the ICD-10 Code for PSVT?
I47.10 is the PSVT ICD-10 code when the provider writes “PSVT” or “paroxysmal SVT” without naming a mechanism. If the note says only “paroxysmal tachycardia” and doesn’t name the origin, the code is I47.9, Paroxysmal tachycardia, unspecified. The word supraventricular separates the two, so check the assessment for it.
What Is the ICD-10 Code for Sinus Tachycardia?
R00.0 is the sinus tachycardia ICD-10 code when the note says “sinus tachycardia” with no qualifier, since sinus tachycardia NOS is an R00.0 inclusion term. Inappropriate sinus tachycardia codes to I47.11, but only when the provider writes that phrase or “IST.” Paroxysmal sinus tachycardia codes to I47.19.
What Is the ICD-10 Code for Ventricular Tachycardia?
I47.20, Ventricular tachycardia, unspecified, covers VT with no type named, and that includes NSVT and sustained VT. Torsades de pointes codes to I47.21. CPVT has its own code, I47.22, for dates of service on or after October 1, 2026. Other specified VT types with no dedicated code go to I47.29.
What Is the ICD-10 Code for Paroxysmal Tachycardia?
I47.9, Paroxysmal tachycardia, unspecified, applies when the provider writes “paroxysmal tachycardia” without naming where it starts. Once the origin appears, the code moves to I47.10 for paroxysmal SVT with no mechanism, I47.19 for paroxysmal atrial or junctional tachycardia, or I47.20 for paroxysmal VT. I47.9 also includes Bouveret-Hoffmann syndrome.
Is I47.1 Still a Valid ICD-10 Code?
I47.1 isn’t valid for billing. It became a non-billable header on October 1, 2023, when I47.10, I47.11, and I47.19 took its place. A claim with I47.1 for a date of service on or after that date gets rejected or denied, so remove it from superbills and EHR favorites along with I47.2 and I49.8.
What Is Tachycardia-Bradycardia Syndrome in ICD-10?
I49.5, Sick sinus syndrome, is the code for tachycardia-bradycardia syndrome, and the Index sends “paroxysmal tachycardia with sinus bradycardia” there too. If the provider documents separate fast and slow episodes without naming a syndrome, R00.0 and R00.1 can each apply. A note that says only “tachy-brady” deserves a quick query.
Can R00.0 Be Coded With AFib With RVR?
R00.0 doesn’t belong on a claim for AFib with RVR. RVR describes the ventricular rate the atrial fibrillation produces, so the fast rate is integral to the AFib (Section I.B.5). Code the documented AFib type instead, such as I48.0, I48.19, I48.21, or I48.91, and leave the symptom code off.
Does R00.0 Support a Holter Monitor Claim?
R00.0 support depends on your MAC. As of October 23, 2026, Novitas Article A59268 lists R00.0 for ambulatory ECG monitoring, and WPS Article A57476 doesn’t. The same list applies when you bill only the physician review under Holter interpretation code 93227. Check your own MAC’s article before you bill.
Getting Tachycardia Claims Right the First Time
Three checks catch most tachycardia coding problems before a claim leaves your system. Run them on the claim first, then on the template that built it, so the same error doesn’t come back next month.
- Did the provider name a rhythm? No rhythm means R00.0, and a named rhythm means the I47 subcode.
- Is the code a billable fifth character, or a header like I47.1 or I47.2?
- Is the code on your MAC’s list for the test you’re billing?
If you’d like a team that runs these checks on each cardiology claim, our end-to-end cardiology RCM service covers each step from coding through payment posting.
Last updated October 23, 2026. Code sets: FY2027 ICD-10-CM (October 1, 2026 to September 30, 2027).
This guide is educational. It doesn’t replace your MAC’s coverage policy, your payer contracts, or advice from your compliance team.
Sources
- FY2027 ICD-10-CM Official Guidelines for Coding and Reporting (CMS, PDF)
- ICD-10 Codes: 2027 ICD-10-CM files (CMS)
- ICD-10-CM (CDC National Center for Health Statistics)
- Billing and coding article A59268, Novitas Solutions (CMS Medicare Coverage Database)
- Billing and coding article A57476, WPS (CMS Medicare Coverage Database)
- NCD 20.15, Electrocardiographic Services (CMS Medicare Coverage Database)
- 2027 Model Software and ICD-10 Mappings (CMS)
