73630 CPT Code: Complete Foot X-Ray Billing, Modifiers, and Denial Prevention for 2026

A foot X-ray is one of the simplest studies a podiatry or urgent care office runs. It’s also one of the most mis-billed. Three things sink these claims: the view count on the report, a missing laterality modifier, and an imaging modality your billing team never sees.

This 73630 CPT code guide covers the 2026 RVU components, both new conversion factors, and the NCCI bundling rule cited by chapter. You’ll also get the RT and LT versus modifier 50 split, two modality modifiers most billers have never appended, and the ICD-10 pairings that carry medical necessity.

Every rule below traces to a CMS manual section or the AMA descriptor. Payment figures name the file and the conversion factor they came from, so your team can check the math instead of taking our word for it.

CPT 73630 at a Glance

What Is CPT Code 73630?

CPT 73630 is a complete radiologic examination of the foot, minimum of three views. That means dorsoplantar, lateral, and oblique. The code already covers the whole foot, toes and calcaneus included. Shot only two views? That’s 73620, and billing 73630 anyway is how audits start.

The word complete carries weight in CPT radiology grammar. It signals a defined minimum view threshold, not a quality judgment about the study. The same convention runs through 73610 for the ankle and 73130 for the hand, where complete also means at least three views.

73630 sits in the Diagnostic Radiology section of CPT, under Diagnostic Imaging Procedures of the Lower Extremities, inside the 73501 to 73725 range. That placement matters on appeal, because it establishes the service as diagnostic imaging rather than a procedure carrying a surgical package.

Providers order the study for fracture, dislocation, arthritis, osteomyelitis, tumor, and congenital deformity. Trauma and persistent foot pain drive most of the volume in podiatry and urgent care, where the patient walks in with a specific complaint and leaves with a film.

The Three Views 73630 Requires

Dorsoplantar, lateral, and oblique

Each of the three standard views answers a different clinical question, and the report should name all three.

All three have to appear in the radiology report by name. A report that says multiple views without naming them won’t support 73630 on audit, and the reviewer isn’t going to guess in your favor.

What the code already includes

The foot includes the toes and the calcaneus, so 73630 already covers imaging of both. That’s a national correct-coding rule, which means no amount of documentation and no conversation with the payer changes it. The bundling consequences show up further down this page.

One more item belongs in the report: whether the study was weight-bearing or non-weight-bearing. The code doesn’t distinguish between them. The clinical interpretation does, and several payer policies reference the distinction when they review foot imaging.

73630 vs 73620: Which Foot X-Ray Code Applies

73630 CPT code selection turns on one number. Three or more views is 73630. Exactly two views is 73620. The count documented in the radiology report controls the code, not the number the ordering provider requested and not the number the technologist meant to shoot.

Billing 73630 when the technologist shot two views is upcoding. An auditor proves it in one step, because the report either names three views or it doesn’t. There’s no clinical judgment to argue about and no documentation you can add after the claim goes out.

The reverse error costs money and gets far less attention. Practices that default to 73620 out of caution, when the technologist shot and documented three views, undercode every one of those claims. Both directions land as findings in a coding audit.

If you’re not sure which way your foot X-rays are trending, pull 20 charts and compare the views named in each report against the code billed. That takes an afternoon and it tells you which direction your exposure runs.

What 73630 Is Not

It is not a surgery code

73630 is not a surgery code. It sits in the Radiology section of CPT, range 73501 to 73725, and describes a diagnostic imaging service. No surgical package attaches to it, no operative report supports it, and no global surgical period applies.

Several published summaries of this code describe 73630 as involving medical decision-making and medication management. That language belongs to evaluation and management codes. A foot X-ray carries no MDM component and no medication element, and repeating that description on an appeal will cost you credibility with the reviewer.

It is not 75630

75630 is abdominal aortography, a catheter-based study of the aorta and the lower extremity arteries. It shares four digits with 73630 and nothing else. A claim or a lookup that lands on 75630 when a foot X-ray was intended is a transposition, and correcting it takes one keystroke.

What You Cannot Bill With 73630

73650 and 73660 on the same foot

The foot includes the toes and the calcaneus, so 73630 already includes radiologic examination of both. Don’t report 73650 for the calcaneus or 73660 for the toes alongside 73630 for the same foot on the same date of service. The Medicare NCCI Policy Manual, Chapter IX, states it in those terms.

Most guides call this bundling and stop there. On your claim, that word means no modifier overrides the rule and no documentation improves it. A 73630 CPT code claim carrying 73650 for the same foot heads toward a denial no matter how well the provider documented the visit.

The same included-service logic governs other imaging families, including NCCI bundling in cardiac CT, where the base code already absorbs the components billers try to add.

You can pull the current rule text from the NCCI Policy Manual Chapter IX before you build the edit into your scrubber.

When these codes are payable

These codes are payable together when the imaging covered different feet. A right foot complete study billed as 73630-RT alongside a left calcaneus study billed as 73650-LT is a legitimate claim. The laterality modifiers are what make it legitimate. Strip them out and the pair reads as unbundling to the payer’s claim editor.

That last row catches people. Medicare doesn’t pay 73620 and 73630 together on the same foot on the same date of service, because a two-view study and a three-view study of the same anatomy on the same day describe one service.

Can You Bill 73610 and 73630 Together?

Yes. No NCCI PTP edit exists between 73630 and 73610. The two codes describe different anatomic regions, the foot and the ankle, and both are payable when both studies are medically necessary and documented as separate evaluations.

If that pair keeps denying, the bundling assumption is sending your team down the wrong path. There’s no edit to override, which means modifier 59 won’t fix it, and appending 59 to a pair with no edit makes the claim look worse on review. The denial is coming from somewhere else, and coding denial recovery starts with finding out where.

Check laterality first. A foot and an ankle on the same side still need RT or LT on each line, and many payers auto-deny without them. Then check diagnosis linkage, because foot pain alone doesn’t establish medical necessity for an ankle film. Each code needs its own supporting diagnosis on the claim.

One more item belongs in your workflow. CMS updates CMS NCCI PTP edits quarterly, so a code pair carrying no edit today can pick one up next quarter. Refresh your edit logic on that cadence instead of treating a one-time check as permanent.

RT, LT, and Modifier 50 on Foot X-Rays

Unilateral studies need RT or LT

Every unilateral foot X-ray needs a laterality modifier. RT for the right foot, LT for the left. Many payers auto-deny a unilateral study submitted without one, and the rejection often reads as a missing or inconsistent modifier rather than anything that names laterality. That wording sends billers hunting in the wrong place.

Bilateral studies: modifier 50 or two lines

Most payers want modifier 50 on a single line for bilateral imaging. Some want two lines, one RT and one LT, each carrying one unit. A smaller group wants two lines with modifier 50 on each. Getting this wrong produces either a denial or a half-payment, and the half-payment is worse because it looks paid on your aging report.

Treat this as a payer configuration item rather than a coding judgment call. It belongs in the payer rules table your billing system references, and someone should verify it when a new contract loads. The same RT and LT modifier rules govern other unilateral procedures your practice bills.

When Medicaid rejects both

A podiatry office images and interprets both feet in house, bills 73630 with modifier 50, and Medicaid denies the claim. The office then tries anatomical modifiers to separate the lines, and Medicaid refuses those as well. That scenario comes up often enough that your team should plan for it.

State Medicaid programs and their managed care organizations set modifier acceptance rules on top of the state baseline, and some MCOs don’t follow the Medicare bilateral convention at all.

Work it in order. Check the state Medicaid provider manual’s modifier section first, then the specific MCO’s billing guide. Those are two rule sets landing on one claim, and Medicaid MCO appeals turn on which of the two you cite.

Modifier 26 and TC: Billing the Right Component

When to use modifier 26

Modifier 26 covers the professional component: the physician’s interpretation and the signed report. It applies when the interpreting physician didn’t own the equipment or supply the space, staff, and materials. A non-employed radiologist reading images produced at a facility is the standard case, and our modifier 26 and TC guide covers the PC/TC indicators in full.

CMS treats the written report as part of the interpretation. If the report doesn’t exist, or exists without a signature your team can retrieve, the professional component isn’t supportable. Chapter 13 of the Medicare Claims Processing Manual sets that standard, and reviewers hold claims to it.

When to use modifier TC

Modifier TC covers the technical component: equipment, technologist time, supplies, and image production. The entity that owns and operates the equipment bills it.

A podiatry office with an in-house X-ray unit that produces and interprets the study bills the global service, with no component modifier at all. Appending 26 there strips out the technical component the practice provided and underpays the claim, often for months before anyone catches it.

Modifier stacking order

Component modifiers are pricing modifiers, and pricing modifiers go in the first modifier field. Anatomical modifiers describe location and go last. Billing the professional component on a left foot study gives you 73630-26-LT, in that order.

Modifier 50 doesn’t combine with 26, TC, RT, or LT on most payer edits. For bilateral professional-component billing, submit two lines carrying 26-LT and 26-RT rather than a single line with 26-50.

FX and FY: The Two Modifiers Almost Nobody Appends

Film X-rays lose 20% of the technical component

If your X-ray unit still uses film, Medicare reduces payment for the technical component, and the technical portion of the global fee, by 20%. That has been the rule since January 1, 2017, and the claim needs modifier FX before Medicare applies the reduction. Section 20.2.5 of the Medicare Claims Processing Manual Chapter 13 sets it out.

73630 is a plain-film study, so this applies to it by definition. It also applies to the global service, not only to a standalone technical component claim, which catches practices that assume the reduction only touches split billing.

Computed radiography loses 10%

Computed radiography takes a smaller cut. Payment drops 7% for CY 2018 through 2022 and 10% for CY 2023 and later, and the claim needs modifier FY. Section 20.2.6 of the same chapter covers it.

Computed radiography uses a cassette holding a photostimulable plate that a scanner reads after the exposure. Direct digital radiography captures the image straight off the detector. Plenty of offices running CR believe they’re running DR, and the answer sits on the equipment rather than in the billing system.

Why you find out months later

Neither reduction bounces back as a front-end denial. The claim pays. The money posts. The reduction, or your failure to apply it, surfaces later as a recoupment or a corrected-payment adjustment, often after your practice has recognized and spent the revenue. A post-payment audit review catches the pattern before a contractor does.

Most 73630 CPT code volume comes from podiatry, and podiatry carries a high concentration of older in-office imaging equipment, including cassette-based CR units still running daily schedules. A practice that has never appended FX or FY on a foot X-ray has a modality question to answer, and answering it takes a look at the machine.

Build modality identification into charge capture at the point of service. A biller reading a radiology report three weeks later can’t tell you whether the image came off film, a CR plate, or a DR detector, and guessing on a payment modifier is how the recoupment starts.

If nobody at your practice can say whether your X-ray unit is CR or DR, that’s worth an hour of somebody’s time this week.

When the Technical Component Is Not Payable at All

During a hospital inpatient stay

Medicare contractors may not pay suppliers for the technical component of radiology services furnished to hospital inpatients. The hospital’s prospective payment already covers it.

If an imaging supplier, or any entity other than the hospital, bills 73630-TC or the global service for a study performed inside an inpatient admission window, that claim carries denial and recoupment exposure. CMS describes claim-history matching and recoupment mechanics for this exact situation, and contractors audit for it.

The professional component is a separate question. The interpreting physician’s read stays billable with modifier 26. The technical side is what the hospital payment absorbs.

During a covered SNF Part A stay

The same principle governs skilled nursing facilities. Contractors may not pay the technical component of radiology services furnished to SNF inpatients during a Part A covered stay. The SNF bills, and payment sits inside SNF PPS.

Add one check before billing the technical or global service for 73630: confirm the patient wasn’t in an inpatient or Part A SNF stay on the date of service. That’s an eligibility check, not a coding step, and it belongs at the front end where your staff can still act on it.

2026 Medicare Reimbursement and RVUs for 73630

The RVU breakdown

Medicare prices 73630 from three RVU components, multiplies the total by a conversion factor, and adjusts the result for your locality.

Practice expense is where office and facility diverge. An office that owns the machine, employs the technologist, and stores the images carries those costs, so its non-facility practice expense runs well above the facility value. Pull the exact 73630 line from the current CMS Relative Value Files before you build a projection on it.

Two conversion factors, not one

Beginning in CY 2026, CMS pays two separate conversion factors for the first time. Practitioners in a qualifying alternative payment model are paid at $33.5675. Everyone else is paid at $33.4009, per the CY 2026 Physician Fee Schedule final rule.

Your 73630 CPT code payment now depends partly on APM participation status, not only on locality. Most radiology and diagnostic practices can’t participate in an APM, which puts them on the lower figure. Any published national rate naming a single conversion factor is using one of the two, and most don’t say which.

CMS also applied a 2.5% efficiency adjustment to work RVUs for non-time-based services in 2026. 73630 is non-time-based and carries a 0.17 work RVU, so the adjustment reaches it and offsets part of the conversion factor increase.

Why your rate differs from the national figure

Three things move the number away from any national figure you find. Geographic Practice Cost Indices adjust the rate by locality, so the same study pays differently in Manhattan than in rural Mississippi. Commercial payers negotiate their own rates, commonly above the Medicare allowable. And place of service decides which practice expense value applies.

A national non-facility reference near $34 for CY 2026 at the non-QP conversion factor gives your team a planning number, not a remittance number. Pull rates from the current quarterly Relative Value file rather than a January snapshot, because CMS releases quarterly updates through the year.

Worth checking: if your 73630 payments have held flat for two years while your locality adjustment moved, something in your fee schedule logic went stale.

Does 73630 Have a Global Period?

73630 carries a global period indicator of XXX. The global surgical package concept doesn’t apply to this code at all. No preoperative period, no postoperative period, and no bundled follow-up window attaches to a foot X-ray.

XXX and 000 are different indicators, and the difference matters on appeal. A 000-day global means a zero-day postoperative period on a procedure that does carry a global package. XXX means the concept doesn’t apply, because the service isn’t a surgical procedure to begin with.

With no global window on the code, a repeat foot X-ray taken days later isn’t bundled into an earlier one. Frequency limits and medical necessity govern that second study instead.

Medical Necessity and ICD-10 Pairing for 73630

Diagnoses that support the study

Payers look for a diagnosis that localizes to the foot and describes something a radiograph can evaluate. The categories below cover most supportable indications for CPT code 73630.

Verify the specific ICD-10-CM codes against your payer’s current policy for the date of service. A code appearing on a covered list doesn’t guarantee payment, and the record still has to meet the policy criteria. Code descriptors come from the American Medical Association CPT code set.

Diagnoses that won’t carry it alone

Unspecified pain codes, generalized swelling, and symptom codes without anatomic localization to the foot are weak support on their own. One documented denial involved a foot X-ray billed alongside an office visit and linked to unspecified pain and swelling codes, and the payer rejected the imaging line.

The operating principle is narrow. The diagnosis on the imaging line has to point at the foot and describe something the film can answer. A diagnosis that justifies the visit doesn’t automatically justify the image, and payers read those two lines separately.

Screening is never covered

Medicare does not pay for screening X-rays. Abnormal signs, symptoms, an established disease, or an injury are required before the study becomes payable.

That rule bites hardest in podiatry. A foot X-ray ordered as part of a routine diabetic foot check and coded as screening won’t be covered. The same study ordered because the patient presents with ulceration, progressive deformity, or suspected osteomyelitis is a different claim, and the clinical indication in the order separates them.

Two related rules sit alongside it. Annual X-rays for a stable condition need documented medical necessity, and a comparison study of the unaffected foot doesn’t establish medical necessity by itself.

Billing 73630 With an Office Visit on the Same Day

A patient presents with foot pain, the provider performs an evaluation, orders and interprets a foot X-ray in office, and both services land on the same claim. That sequence runs daily in podiatry, urgent care, and orthopedics.

Both services pay when three conditions hold. The E/M line needs modifier 25 to show a significant, separately identifiable service beyond the imaging. The imaging line needs its laterality modifier. And the diagnoses linked to each line have to support that specific service rather than the encounter in general.

One documented failure looked like this: 99213 with modifier 25 alongside 73630, linked to unspecified pain and swelling diagnoses, rejected for a missing or inconsistent modifier. Two defects sat on that claim at once. The imaging line lacked laterality, and the diagnoses didn’t establish necessity for the film.

When a same-day E/M and imaging claim denies, check laterality on the imaging line and diagnosis linkage on both lines before you assume modifier 25 caused it. Modifier 25 takes the blame for a lot of denials it didn’t cause.

Billing 73630 Inside a Surgical Global Period

A patient sits inside the postoperative global window for a foot procedure and comes back needing imaging. Your team has to decide whether that X-ray belongs to the surgical package or bills separately.

73630 carries an XXX indicator, so it has no global period of its own. The governing question is whether the imaging falls inside the surgical code’s global window and whether it relates to the original procedure. Routine postoperative imaging to assess healing generally belongs to the package.

Most Medicare carriers allow one postoperative X-ray study without extra justification, and more frequent imaging needs documented medical necessity. When imaging inside a global window is unrelated to the original procedure, the documentation has to establish that, and the correct modifier depends on the circumstance and the payer.

Documentation That Survives an Audit

What the radiology report must contain

CMS treats the interpretation of a diagnostic procedure as including a written report, and the CPT radiology section treats a signed report by the interpreting individual as integral to the procedure. For 73630 CPT code claims, the table below is what a reviewer checks first.

One habit separates adequate documentation from strong documentation: name the ordering diagnosis inside the report. If a diagnosis justified ordering the study, and you’re using that diagnosis to bill the study, it belongs in the report text where a reviewer can find it.

What the claim form must show

In-office imaging carries claim form specifics that most coding guides skip. When a podiatrist’s office performs the X-rays, mark the outside lab box in Field 11d as NO, and put the podiatrist’s name and NPI in Field 17 and 17a.

Two more standards belong in the record. A complete study has to be justifiable over a limited study, which means the record should show why the patient needed three views instead of two. And comparison imaging of the unaffected foot doesn’t establish medical necessity by itself.

Pull five recent foot X-ray reports and check whether all three views are named in each one. That’s where the gap shows up first.

IDTF Supervision and Technician Requirements

The 73630 CPT code supervision rules govern independent diagnostic testing facilities, not a physician office billing under its own group. A solo podiatry practice with an in-office unit isn’t an IDTF, and applying IDTF rules to that setting creates confusion your team doesn’t need.

Where an IDTF bills 73630, the MAC’s billing and coding article for that jurisdiction sets the supervising physician qualification and the technician credential.

Palmetto GBA’s article, covering Jurisdictions J and M, lists a board certified radiologist or orthopaedic surgeon as the supervising physician, and a general radiographer or medical physicist as the technician. Pull the article governing your own jurisdiction from the CMS Medicare Coverage Database.

Those qualification tables differ by contractor, so verify the article covering your MAC before you rely on it. The IDTF also has to be credentialed and approved by that MAC’s provider enrollment to bill the specific code, and missing that step produces the larger recoupments.

Why 73630 Claims Get Denied, and How to Fix Each One

Foot X-ray denials cluster into a small set of causes, and your team can fix most of them at the front end instead of through appeal. The table maps each 73630 CPT code denial cause to its correction.

Most practices don’t have one denial cause. They have two or three running at once across different payers, which is why the pattern feels random from the inside. Each payer surfaces a different one first, and fixing one doesn’t touch the others. Full revenue cycle support works the causes together rather than claim by claim.

If two or three of those rows describe claims sitting in your AR right now, map the pattern before you appeal any more of them one at a time.

Which Specialties Bill 73630 Most

Four settings generate most of this volume: podiatry, orthopedics, urgent care, and emergency departments. They don’t bill the code the same way, and the difference in billing pattern decides where each one’s risk sits.

Podiatry runs the highest volume and carries the most exposure. In-office imaging means the practice bills the global service, which puts modality modifiers, laterality, medical necessity, and the diabetic screening distinction on one claim line. That’s four failure points where other specialties carry one or two, and it’s why specialty-matched certified coders matter more here than the volume suggests.

Orthopedics and urgent care split the components or refer out more often, which changes the modifier profile. Emergency departments bill high volume with acute indications, where medical necessity stays clean and laterality errors climb with throughput.

73630 CPT Code FAQ

What is CPT code 73630?

CPT 73630 is a complete radiologic examination of the foot with a minimum of three views, and it includes the toes and the calcaneus.

Does 73630 require a modifier?

Yes. Unilateral studies need RT or LT. Component modifiers apply when billing is split, and modality modifiers apply when the image came off film or computed radiography.

Can you bill 73630 and 73650 together?

Not for the same foot on the same date of service. They’re payable on opposite feet when both lines carry laterality modifiers.

Can you bill 73630 and 73660 together?

The same rule applies. 73630 already includes the toes, so 73660 isn’t separately billable for that foot on that date.

Can you bill 73610 and 73630 together?

Yes. No NCCI edit exists between them. Both lines need laterality modifiers and their own supporting diagnosis.

What is the difference between 73620 and 73630?

73620 is a foot X-ray with exactly two views. 73630 is a complete study with three or more views, including the toes and the calcaneus.

Does 73630 have a global period?

73630 carries an XXX indicator, which means the global surgical package concept doesn’t apply to the code at all.

Is 73630 a surgery code?

No. 73630 is a diagnostic radiology code in the 73501 to 73725 range, with no surgical package attached.

Does Medicare cover 73630?

Yes, when the study is medically necessary. Medicare does not pay for screening X-rays, so the order needs signs, symptoms, an established disease, or an injury.

What does modifier 26 mean on 73630?

Modifier 26 bills the professional component only: the physician’s interpretation and signed report, without the equipment, staff, or supplies.

Do I need modifier FX or FY on 73630?

Yes, if the study ran on film or computed radiography. Film triggers a 20% technical component reduction with FX, and computed radiography triggers 10% with FY.

What is the CPT code for a foot X-ray?

73630 covers a foot X-ray with three or more views. 73620 covers exactly two views of the same anatomy.

Foot X-rays are a small line item that leaks revenue across a full panel. One O Seven RCM handles radiology and podiatry billing for practices in all 50 states, and we start by looking at what your current claims are already telling you.