The ICD-10-CM diagnosis code for palpitations is R00.2 (Palpitations), a billable symptom code valid for patient encounters from October 1, 2026 through September 30, 2027. Providers report R00.2 when they document palpitations or awareness of heartbeat and haven’t confirmed a cause. Once the provider confirms an arrhythmia that explains the palpitations, you report that arrhythmia code instead.
We wrote this palpitations ICD-10 guide at One O Seven RCM for the coders and billers who handle these visits. It covers the FY2027 symptom rules, the R00 family, the October 1, 2026 arrhythmia codes, and the CPT tests R00.2 supports. You’ll find denials and provider documentation in the last sections.
Palpitations ICD-10 code details for FY2027
R00.2 (Palpitations) is a billable ICD-10-CM code in category R00 (Abnormalities of heart beat), inside Chapter 18 for symptoms and signs. Its only official inclusion term is “awareness of heart beat.” The code hasn’t changed since ICD-10-CM took effect in FY2016, and it stays valid in FY2027.
The code card below lists each field a claim or chart audit might ask about for R00.2. It runs from billable status down to the inpatient DRG group.
R00.2 code card (FY2027)
| Field | Value |
|---|---|
| Code | R00.2 |
| Descriptor | Palpitations |
| Inclusion term | Awareness of heart beat |
| Billable status | Billable, valid on HIPAA claims |
| Category | R00 Abnormalities of heart beat (header, not billable) |
| Block and chapter | R00-R09, Chapter 18 (R00-R99) |
| FY2027 validity | October 1, 2026 through September 30, 2027 |
| Excludes1 (at R00) | Abnormalities originating in the perinatal period (P29.1-) |
| Excludes2 (at R00) | Specified arrhythmias (I47-I49) |
| ICD-9-CM equivalent | 785.1 |
| ICD-11 equivalent | MC81.2 (not used on US claims) |
| Inpatient MS-DRG when principal | 308, 309, or 310 |
What does R00.2 cover?
R00.2 covers a patient’s awareness of their own heartbeat, documented by the provider as palpitations. Patients call it fluttering or skipped beats, and code databases list words like those as approximate synonyms. Those aren’t official inclusion terms.
The Alphabetic Index points three entries to R00.2: palpitations (heart), awareness of heart beat, and abnormal pulsations in the neck. Whatever words the patient uses, the ICD-10 code for heart palpitations stays R00.2 once the provider documents the symptom.
Is R00.2 billable in FY2027?
Yes, R00.2 is billable for dates of service from October 1, 2026 through September 30, 2027, per the CMS FY2027 ICD-10 files. Under Section I.A.3, category headers like R00 can’t go on a claim, and R00.2 is the reportable code in that category for this symptom.
R00.2 is the only billable ICD-10 code for palpitations, since it has no subcodes. You’ll also see the R00.2 diagnosis code written as R002. That’s the form it takes on an electronic claim, since the 837 format drops the decimal point.
What are ICD-10-CM diagnosis codes?
ICD-10-CM diagnosis codes are the US clinical modification of ICD-10, maintained by CDC’s National Center for Health Statistics (NCHS). The World Health Organization owns ICD-10 itself, per CDC’s ICD-10-CM page. US payers accept the ICD-10-CM version on claims.
CMS and NCHS publish the Official Guidelines, and the AHA and AHIMA approve them along with those two agencies. HIPAA requires coders to follow the guidelines when they assign ICD-10-CM codes, and payer auditors hold claims to them.
R00.2 vs R00.0, R00.1, R00.8, and R00.9
Category R00 (Abnormalities of heart beat) holds five codes, and R00.2 captures the heartbeat sensation a patient reports. R00.0 and R00.1 capture a fast or slow rate the provider records without naming an arrhythmia. R00.8 and R00.9 cover other and unspecified heartbeat abnormalities.
A heart palpitations ICD-10 choice starts with what the provider recorded, so read the exam and the assessment before you pick from this table.
The five codes in category R00
| Code | Title | Use when the provider documents |
|---|---|---|
| R00.0 | Tachycardia, unspecified | A fast rate with no named arrhythmia |
| R00.1 | Bradycardia, unspecified | A slow rate with no named arrhythmia |
| R00.2 | Palpitations | The patient’s awareness of heartbeat with no confirmed cause |
| R00.8 | Other abnormalities of heart beat | A specified heartbeat abnormality classified nowhere else |
| R00.9 | Unspecified abnormalities of heart beat | A heartbeat abnormality with no further detail |
A patient who says their heart is racing still codes to R00.2 unless the provider records a fast rate. The heart racing ICD-10 answer depends on the vitals and the exam. A patient’s own description doesn’t change the code.
If the provider documents a fast rate with no rhythm diagnosis, the rapid heartbeat ICD-10 code is R00.0. Both R00.2 and R00.0 can go on the claim when the note supports both and no diagnosis explains them. Query the provider if the note is unclear.
Is there an unspecified palpitations code?
No, R00.2 has no subcodes, so you report R00.2 as the ICD-10 code for palpitations unspecified by cause or type. R00.9 is a different concept: an unspecified abnormality of heart beat that the provider observes, separate from the symptom the patient feels.
Don’t confuse R00.2 with R20.2
R20.2 is paresthesia of skin, and it sits one keystroke away from R00.2. If a biller types it on an EKG claim, the payer sees a skin diagnosis on a heart test and usually denies the line. A scrubber edit that flags R20.2 on cardiac test lines catches the slip.
When to use R00.2 under the FY2027 guidelines
R00.2 belongs on the claim whenever the provider documents palpitations and no related definitive diagnosis is established by the end of the encounter. The FY2027 Official Guidelines (Sections I.B.4 and I.B.18) accept symptom codes in that situation. They direct coders to code each encounter to the level of certainty known at that visit.
Code the symptom until the provider confirms a diagnosis
Section I.B.4 of the FY2027 ICD-10-CM Official Guidelines accepts symptom codes when the provider hasn’t established a related definitive diagnosis. Under Section I.B.18, each encounter gets coded to the level of certainty known at that visit.
That section also warns against medically unnecessary testing done only to reach a more specific code. Section I.A.19 bases code assignment on the provider’s statement, so R00.2 doesn’t need a normal ECG or a negative workup first.
In most offices, R00.2 is the palpitations diagnosis code that justifies ordering the ECG in the first place. If the ECG is read at that visit and names a rhythm, the test claim takes that rhythm code instead. Our EKG billing rules guide covers that claim line.
Outpatient visits: rule out arrhythmia still codes to R00.2
Section IV.D accepts symptom codes in outpatient settings when no diagnosis is established. Under Section IV.H, you don’t code diagnoses documented as probable, suspected, questionable, rule out, or working diagnosis. You code to the highest certainty instead, which is usually R00.2.
Worked example: an outpatient palpitations visit
| What the note says | First-listed code |
|---|---|
| “Palpitations for 2 weeks. ECG normal sinus rhythm. Rule out SVT. Holter ordered.” | R00.2, with no SVT code until the provider confirms SVT |
The ICD-10 for palpitations at that visit stays R00.2, the first-listed code. A planned Holter doesn’t change that. If the Holter later confirms SVT, the interpretation claim carries the SVT code and drops R00.2, per Section IV.K.
Use the outpatient term “first-listed diagnosis” on office palpitations ICD-10 claims, since “principal diagnosis” belongs to inpatient coding. On the CMS-1500, the first-listed diagnosis goes in Box 21, line A. Point the visit line to it first.
Hospital inpatient coding follows different rules
Section II.H lets inpatient facility coders code uncertain diagnoses documented at discharge as if they were established. A symptom code can’t be the principal diagnosis under Section II.A once a related definitive diagnosis is confirmed.
Inpatient stays with R00.2 as the principal diagnosis group to MS-DRG 308, 309, or 310. Most compliance programs apply the outpatient rule on uncertain diagnoses to physician claims, even for hospital visits. Confirm your own policy before you code a rule out from a hospital note.
When a confirmed arrhythmia replaces R00.2
R00.2 drops off the claim once the provider confirms an arrhythmia that explains the palpitations; you report that arrhythmia code. Section I.B.5 bars separate codes for symptoms routinely associated with a disease. The Excludes2 note at R00 allows both codes when the provider documents palpitations the arrhythmia doesn’t explain, or when a Tabular note instructs it.
What the Excludes2 note at R00 means
Section I.A.12.a defines an Excludes1 note as “NOT CODED HERE!” and keeps the two codes apart, except when the conditions are unrelated. An Excludes2 note means “Not included here,” under Section I.A.12.b. A patient can have both conditions, and you can report both codes when the record supports them.
At R00, perinatal heartbeat abnormalities (P29.1-) fall under Excludes1, and specified arrhythmias (I47-I49) fall under Excludes2. Reading that Excludes2 note as a ban leads to undercoding when the provider documents palpitations as a separate, unexplained complaint.
Why the arrhythmia code usually stands alone
Section I.B.5 keeps symptoms routinely associated with a disease off the claim as additional codes, unless the classification instructs otherwise. Symptoms that aren’t routine to the condition get coded when present, under Section I.B.6. For most arrhythmias, palpitations are an expected symptom, which is why the rhythm code usually stands alone.
Section I.C.18.b says the same thing for Chapter 18 codes. A symptom code can sit beside a related definitive diagnosis when the symptom isn’t routinely associated with it. That rule settles most palpitations ICD-10 questions involving a known arrhythmia.
Take a patient whose Holter shows atrial fibrillation, which the provider documents as the cause of the palpitations. You report the AFib code alone, such as I48.91 when the type isn’t specified. Our AFib ICD-10 coding guide covers the type codes.
Now take a patient with known, controlled AFib who reports new palpitations, and the provider documents that the AFib doesn’t explain them. Both codes are supportable on that claim, because the record separates the symptom from the condition.
ECG and monitor findings mapped to the right code
The rhythm the provider documents from the ECG or monitor decides the code, so match the interpretation to this table before you finalize the claim.
ECG and monitor findings and the codes they support
| Finding documented by the provider | Code |
|---|---|
| Normal sinus rhythm, palpitations unexplained | R00.2 |
| Sinus tachycardia, no other rhythm diagnosis | R00.0 |
| Sinus bradycardia, no other rhythm diagnosis | R00.1 |
| Premature atrial contractions (PACs) | I49.1 |
| Premature ventricular contractions (PVCs) | I49.3 |
| Ventricular bigeminy | I49.82 (new October 1, 2026) |
| Atrial fibrillation, type not specified | I48.91 |
| Atrial flutter, type not specified | I48.92 |
| Supraventricular tachycardia, mechanism not specified | I47.10 |
| AVNRT, AVRT, or atrial tachycardia | I47.19 |
| Arrhythmia documented, type not specified | I49.9 |
For irregular heartbeat ICD-10 coding, the provider’s words decide the code. An irregular rhythm documented without a name points to I49.9, and a patient who only reports feeling skipped beats stays at R00.2. Abnormal heart rhythm ICD-10 questions follow the same split.
Check index entries for your date of service in the CDC ICD-10-CM Browser Tool, since FY2027 added new arrhythmia codes. A rhythm code from last year’s superbill can fail a payer edit after October 1, 2026.
Cardiology claims tend to slip when a patient moves from R00.2 to a confirmed rhythm code between visits. Our specialty billing services for cardiology match each monitor result to the diagnosis on the claim before it goes out.
FY2027 arrhythmia code changes for palpitations claims
R00.2, the palpitations ICD-10 code, didn’t change in FY2027, but several codes that replace it did. Per the CMS 2027 ICD-10-CM Addendum, I49.8 became a non-billable header on October 1, 2026. I49.81, I49.82, I49.89, and I47.22 became billable codes that day.
Claims dated on or after October 1, 2026 need the FY2027 codes in this table, and the old header codes will fail payer edits.
FY2027 arrhythmia code changes that affect palpitations workups
| Code | Description | Status from October 1, 2026 |
|---|---|---|
| I49.8 | Other specified cardiac arrhythmias | Header, no longer billable |
| I49.81 | Brugada syndrome | New, billable |
| I49.82 | Ventricular bigeminy | New, billable |
| I49.89 | Other specified cardiac arrhythmias not elsewhere classified | New, billable |
| I47.22 | Catecholaminergic polymorphic ventricular tachycardia (CPVT) | New, billable |
| I47.1 | Supraventricular tachycardia | Header since FY2024; use I47.10, I47.11, or I47.19 |
Staff pick old codes from superbills and EHR favorite lists without checking the code year. A header code on the claim then gets rejected at the clearinghouse or the payer. Clean those lists up before the first FY2027 claims go out:
- Remove I49.8 and I47.1 from superbills, EHR favorites, and charge templates.
- Match the code set to the date of service, so late charges for encounters before October 1, 2026 keep FY2026 codes.
- Add a scrubber edit that rejects header codes before submission.
Billers see these changes first on monitor claims, since a bigeminy or Brugada finding now has its own code. If the reading physician documents bigeminy, the interpretation claim needs I49.82. Our event monitor billing guide covers the hook-up claim for those tests.
Coding palpitations with other symptoms or a known cause
R00.2 can share a claim with other symptom codes when no diagnosis explains them, and each symptom gets its own code. Once the provider names a cause, you code the cause and drop R00.2 if the palpitations are routine to it. Drug side effects follow a separate sequencing rule.
Palpitations with chest pain, dizziness, or shortness of breath
For ICD-10 palpitations and chest pain coding, report R00.2 and a chest pain code from category R07 when the provider hasn’t found a cause. Pick the most specific R07 code the note supports, such as R07.89 for other chest pain or R07.9 when it’s unspecified.
Sequence the codes by the reason for the visit, per Section IV.G. If the patient came in for chest pain and mentioned palpitations, chest pain goes first. The order matters on EKG claims, because some payer edits read the first diagnosis pointer.
These symptom codes show up beside R00.2 on workup claims, and each one stays on the claim until a diagnosis explains it.
Symptom codes reported with R00.2
| Symptom the provider documents | Code | Rule of thumb |
|---|---|---|
| Chest pain, unspecified | R07.9 | Use R07.89 or another R07 code when the note says more |
| Dizziness | R42 | Report it while no diagnosis explains it |
| Syncope | R55 | Sequence it by the reason for the visit |
| Shortness of breath | R06.02 | Report it when the provider records it as a symptom |
| Heart murmur | R01.1 | Keep it until the provider names the valve condition |
When the provider names the cause
Once the provider documents a cause, you code the cause. Take thyrotoxicosis: if the provider links the palpitations to it, you report a code such as E05.90. R00.2 stays off when the palpitations are a routine part of that condition, under Section I.B.5.
Drug side effects follow their own rule under Section I.C.19.e.5.(a). If a correctly prescribed drug causes the palpitations, R00.2 goes first and the adverse effect code from categories T36-T50 follows it. Billers who put the drug code first get the sequence backward.
Palpitations ICD-10 coding in special scenarios
R00.2 still covers intermittent palpitations, even with long gaps between episodes, but a resolved episode doesn’t take R00.2 or any other symptom code. Pregnancy puts a Chapter 15 code first. POTS and newborn heartbeat problems move to codes of their own.
Palpitations in pregnancy ICD-10 coding
Section I.C.15.a.1 gives Chapter 15 codes sequencing priority, so a pregnant patient’s palpitations visit starts with an O code. R00.2 follows as an additional code to name the symptom, and a Z3A code records the weeks of gestation when known.
The O code depends on the provider’s note. Pregnancy-related palpitations usually go to O26.89- by trimester, while other conditions complicating the pregnancy use O99.891. If the provider documents the pregnancy as incidental to the visit, Z33.1 replaces the O code.
Intermittent palpitations ICD-10 coding
Intermittent palpitations still code to R00.2, because ICD-10-CM has no separate code for how often the symptom comes back. Document the pattern anyway. The provider picks the monitor based on frequency, and the payer checks it for coverage.
History of palpitations ICD-10: is there a code?
ICD-10-CM has no code for a history of palpitations, and R00.2 doesn’t belong on a claim for a symptom that has resolved. If the patient still has episodes, R00.2 applies to the current visit, even when the note also describes earlier ones.
Some coders use Z87.898, personal history of other specified conditions, when the provider wants past episodes on record. Check that choice with your compliance lead first. Z86.79 fits better when the history is a resolved arrhythmia.
ICD-10 code for postural tachycardia syndrome (POTS)
G90.A is the code for postural orthostatic tachycardia syndrome, billable since FY2023. Palpitations are a common POTS symptom, so R00.2 usually stays off once the provider documents the syndrome. Before G90.A existed, some coders used R00.0, so check old charge templates for it.
Newborns: the palpitation ICD-10 code doesn’t apply
The Excludes1 note at R00 sends heartbeat abnormalities that start in the perinatal period to category P29.1-. A newborn with a documented fast or slow rhythm gets P29.11 (neonatal tachycardia) or P29.12 (neonatal bradycardia), and R00 codes stay off that claim.
CPT codes R00.2 supports and Medicare coverage rules
R00.2 supports the standard palpitations workup: office visits, ECGs, Holter and extended monitors, event monitors, mobile telemetry, and echocardiograms. Medicare covers ECG services for documented symptoms under NCD 20.15, which names palpitations. Under that NCD, Medicare doesn’t cover ECGs done as screening tests outside the Welcome to Medicare visit.
The palpitations workup by CPT code
R00.2 supports each test in this table when the note documents palpitations and the reason for the test. Our cardiology CPT codes guide covers the wider test family.
CPT codes in a palpitations workup
| Test | CPT codes | What to watch on the claim |
|---|---|---|
| Office or outpatient visit | 99202-99205, 99211-99215 | R00.2 first-listed when no cause is found |
| Routine 12-lead ECG | 93000 (global), 93005 (tracing), 93010 (interpretation) | Use the split codes when two entities share the work |
| Holter monitor, up to 48 hours | 93224-93227 | Fits patients with daily or near daily symptoms |
| Extended external ECG recording, more than 48 hours up to 7 days | 93241-93244 | Document symptom frequency to support the longer recording |
| Extended external ECG recording, more than 7 days up to 15 days | 93245-93248 | Same frequency documentation, with the longer wear time explained |
| External event monitor, up to 30 days | 93268, 93270-93272 | Suits symptoms that come less often than daily |
| Mobile cardiac telemetry, up to 30 days | 93228, 93229 | Check prior authorization rules with commercial payers |
| Transthoracic echocardiogram | 93306 | Check your MAC’s echo policy for the listed diagnoses |
Most of these codes split into a technical piece and a professional read. If a hospital or IDTF owns the equipment and your physician reads the study, you bill the interpretation code or modifier 26. Our modifier 26 guide covers that split.
Medicare coverage under NCD 20.15 and MAC policies
NCD 20.15 covers ECG services when the patient has documented signs or symptoms. Its symptom list reads “syncope, dizziness, chest pain, palpitations, or shortness of breath.” A palpitations visit with that symptom in the note meets the NCD’s bar, and payment then depends on your MAC’s policy.
Novitas LCD L39490 names palpitations as an indication for ambulatory ECG monitoring. That LCD calls a 24 to 48 hour monitor most appropriate for daily or near daily symptoms. Its billing article, A59268, lists R00.2 among the covered diagnoses for the Holter, extended monitor, event monitor, and telemetry codes.
Novitas covers Jurisdictions H and L, and other MACs publish their own lists and documentation rules. Pull your MAC’s LCD and billing article before you build palpitations ICD-10 charge rules for monitors. Commercial payers set their own prior authorization rules for extended monitoring and telemetry.
Why R00.2 claims get denied and how to fix them
R00.2 claims come back denied for a short list of reasons, from a mistyped code to a test the payer reads as screening. Read the CARC and RARC first, since the fix for a CO-11 denial differs from the fix for a CO-50. Some denials need a corrected claim, and others won’t clear without an appeal.
The R00.2 denial table
Match the remittance to the closest row, then confirm the fix against the CARC and RARC your payer sent. Pairs vary by payer, so treat the second column as the usual pattern, and don’t appeal until the cause is clear.
R00.2 denial patterns, causes, and fixes
| Denial pattern | Codes you’ll see | Usual cause | Fix |
|---|---|---|---|
| Diagnosis doesn’t support the test | CO-11 | R20.2 typed for R00.2, or R00.2 missing from the line’s diagnosis pointer | Correct the code or pointer and resubmit |
| Not medically necessary | CO-50 | Test ordered with no documented symptom, or billed as a routine screening | Appeal with the note if the symptom was documented; don’t rebill a true screening |
| Invalid diagnosis code | Front-end rejection, or CO-16 with RARC M76 | I49.8 or I47.1 billed for a date of service on or after October 1, 2026 | Replace it with the FY2027 code and resubmit |
| Missing claim data | CO-16 | Interpretation claim without the ordering or referring provider | Add the missing data and resubmit |
| Symptom kept beside a confirmed arrhythmia | Payer edit or audit finding | R00.2 billed with an arrhythmia code that explains it | Remove R00.2 unless the note documents it as separate |
For the first two rows, our guides to CO-11 diagnosis mismatch denials and CO-50 medical necessity denials walk through the fix step by step.
Stop R00.2 denials before submission
Your scrubber can catch three of these patterns before a payer sees them. One edit flags R20.2 on cardiac test lines, and another blocks header codes like I49.8 and I47.1. A third requires a symptom or rhythm code on each monitor line, which heads off the CO-50 setup.
Repeat CARCs on cardiology claims point to a gap in the charge workflow. Our denial management services team traces each pattern to its source. We fix the workflow along with the claim, so the same CARC is less likely to come back.
Provider documentation checklist for palpitations visits
R00.2 holds up on a claim when the note shows the symptom in the provider’s words and what the exam and ECG found. The note also needs the reason for each test the provider ordered. That record supports the palpitations dx code, the CPT codes, and any appeal that follows.
Ask providers to cover these points in each palpitations note, in their own words, so coders don’t have to query them after the visit:
- Palpitations named as the complaint, with onset and duration
- How often episodes happen and what sets them off
- Associated symptoms such as dizziness, chest pain, or fainting
- Exam findings, including heart rate and rhythm
- The ECG interpretation, with the rhythm named
- The reason for any monitor and why its length fits the symptom pattern
- An assessment that says whether a cause has been confirmed
Monitor orders need the most care. A note that says “Holter for palpitations” without the episode pattern leaves you nothing to show when a payer questions a 14-day patch. One line on frequency in the order gives you that support.
Palpitations ICD-10 FAQs
What is the ICD-10-CM code for heart palpitations?
R00.2 is the ICD-10 code for palpitations, including heart palpitations a patient describes as racing or fluttering. It’s billable for encounters from October 1, 2026 through September 30, 2027. If the provider confirms an arrhythmia that explains the symptom, the arrhythmia code replaces R00.2.
Can R00.2 be the primary diagnosis?
Yes, R00.2 can be the first-listed diagnosis on an outpatient claim when no definitive diagnosis is established, under Sections I.B.4 and IV.D. On an inpatient claim, R00.2 can be principal only while no related definitive diagnosis is confirmed, per Section II.A.
What diagnosis code for heart palpitations supports an EKG?
R00.2 supports a diagnostic EKG, such as 93000, when the provider documents palpitations. NCD 20.15 lists palpitations among the symptoms that justify ECG services for Medicare patients. Medicare won’t cover the same EKG as a screening test outside the Welcome to Medicare visit.
Can I bill R00.2 with an arrhythmia code on the same claim?
Only when the provider documents palpitations that the arrhythmia doesn’t explain. Section I.B.5 keeps routine symptoms off the claim, and the Excludes2 note at R00 allows both codes when the record separates them. Otherwise, report the arrhythmia code alone.
Do ICD-10 palpitations codes differ for heart palpitations?
No, ICD-10-CM treats heart palpitations and palpitations as the same symptom, so both go to R00.2. Coders who look up heart palpitations ICD-10 guidance end up at the same code. Words like racing or pounding in the note don’t change it.
Is there a palpitations ICD-11 code?
Yes, MC81.2 is the ICD-11 code for palpitations in the World Health Organization’s newer classification, available in the WHO ICD-11 browser. US claims still use ICD-10-CM, so MC81.2 won’t pass a payer edit here. Keep it out of your chargemaster and EHR favorites.
What was the palpitation ICD-9 code?
785.1 (Palpitations) was the ICD-9-CM code, and it maps one to one to R00.2. You’ll need it only for records or claims with dates of service before October 1, 2015, when ICD-10-CM took effect in the United States.
Get palpitations claims paid the first time
R00.2 claims tend to pay on first submission when the code matches the note and the code year matches the date of service. If CO-11 and CO-50 denials keep your team busy, we’ll take that follow-up off your plate. At One O Seven RCM, our revenue cycle management services cover coding review and denial follow-up for cardiology practices.
Sources
Code set and coding guidelines
- CMS: FY2027 ICD-10-CM Official Guidelines for Coding and Reporting (PDF)
- CMS: ICD-10 codes and FY2027 files
- CMS: 2027 ICD-10-CM Addendum (ZIP)
- CDC NCHS: ICD-10-CM
- CDC: ICD-10-CM Browser Tool
- WHO: ICD-11
