CPT code 73100 – Wrist radiologic examination, 2 views

Key takeaways

CPT code 73100 covers a radiologic examination of the wrist with exactly 2 views, not 3 or more.

Code from the signed radiology report, not the order, because the radiologist may add a third view.

Modifier 26 covers the professional component and TC covers the technical component when two entities bill separately.

The 2026 Medicare rate varies by MAC locality, so check the CMS Physician Fee Schedule before billing.

Pabau’s claims management software links CPT codes, modifiers, and ICD-10 diagnoses at the point of care, reducing modifier-omission denials.

What CPT code 73100 covers

CPT code 73100 is the five-digit procedure code that describes a radiologic examination of the wrist using two radiographic projections. The American Medical Association (AMA), which owns and maintains the CPT code set, publishes the official descriptor as: Radiologic examination, wrist; 2 views.

A “view” here means a distinct radiographic projection, such as posteroanterior (PA), lateral, or oblique. The code is valid for the 2026 billing year and is a HIPAA-covered transaction.

It sits in the Diagnostic Radiology (Diagnostic Imaging) Procedures of the Upper Extremities range (73000-73225). The other upper extremity plain-film codes in that range are covered later in this article.

When to use CPT code 73100: Clinical indications

Use CPT code 73100 when the clinical record documents a wrist X-ray performed with exactly two radiographic projections. Medical necessity rests on the presenting complaint the ordering note documents. The indications below are the ones that support it.

• Acute wrist trauma with point tenderness, swelling, or mechanism of injury suggesting fracture
• Suspected distal radius or scaphoid fracture where clinical exam alone is insufficient
• Chronic wrist pain unresolved after conservative treatment, requiring structural assessment
• Post-reduction or post-casting follow-up to confirm alignment or healing progress
• Carpal instability evaluation when clinical presentation suggests ligamentous injury
• Pre-operative planning for wrist procedures requiring baseline imaging

Do not use 73100 when the radiology report confirms three or more views were taken. That scenario requires CPT 73110. Billing 73100 when the documentation shows three projections is under-coding. Billing 73110 when only two views were performed is upcoding, a form of healthcare fraud. The view count documented in the radiology report must match the code billed, every time.

CPT 73100 vs CPT 73110: Key differences

CPT 73110 describes a radiologic examination of the wrist with a minimum of three views. That single distinction, the view count, is the entire basis for selecting one code over the other. When a radiologist documents two projections, the code is 73100. When the report documents three or more, the code is 73110.

Some radiologists add an oblique view to every wrist study. Those practices need an internal protocol that sends coders the finalized view count from the report, before billing. The order may request two views; the radiologist may add a third based on clinical findings. Coding from the order rather than the final report is a common audit trigger.

Modifiers for CPT code 73100

Four modifiers apply regularly to CPT code 73100. Choosing the wrong one, or omitting one entirely, is the leading cause of denials on this code. Modifier rules vary by payer and by setting (facility vs. non-facility), so confirm with each commercial payer before assuming a universal rule applies.

The modifier 26/TC split is one of the most frequently misapplied rules in radiology billing. When a physician owns the imaging equipment and performs and interprets the X-ray in their own office, they bill the global service with no modifier.

When the imaging is performed at a hospital or free-standing facility and the radiologist bills independently, the facility submits 73100-TC and the radiologist submits 73100-26. Submitting the global code from a facility setting, or omitting TC when billing from a facility, triggers payer edits and denials. The three arrangements below show which modifier each one calls for.

CPT 73100 reimbursement and 2026 Medicare fee schedule

The 2026 Medicare reimbursement rate for CPT code 73100 is set by the CMS Physician Fee Schedule (MPFS) and varies by MAC locality. National average figures are a useful reference point, but the payment a practice receives depends on the geographic practice cost index (GPCI) for its location.

Use the MPFS lookup tool with your locality code to verify current rates before quoting patients or negotiating payer contracts.

The global rate covers both the professional and technical components when a single provider bills both. The modifier 26 rate (professional component only) and the TC rate (technical component only) together sum to approximately the global rate. Rounding differences can apply.

Radiology practices should verify reimbursement separately by modifier using the FastRVU 2026 RVU lookup tool, which pulls directly from CMS data and allows location-adjusted calculations.

Commercial payers negotiate rates independently and may reimburse above or below Medicare. Many base their fee schedules on a percentage of the Medicare rate (for example, 115% of MPFS), but this varies by contract.

ICD-10 diagnosis codes commonly billed with CPT 73100

Medical necessity for CPT code 73100 must be supported by a billable ICD-10-CM diagnosis. The diagnosis should reflect the clinical reason the X-ray was ordered. Listing an ICD-10 code that does not logically connect to a wrist imaging study invites a medical necessity denial. Selecting the diagnosis code is as important as selecting the CPT code itself.

Payer Local Coverage Determinations (LCDs) issued by Medicare Administrative Contractors may restrict which ICD-10 codes support medical necessity for CPT 73100. No specific diagnosis code guarantees reimbursement. Check your MAC’s active LCD for radiology imaging before assuming a diagnosis code is sufficient.

When the documented presentation does not match one of these, the full ICD-10-CM index lists the alternatives by body system.

Documentation requirements for accurate billing

Incomplete documentation is the second-most-common reason CPT 73100 claims are denied or flagged in audits, after incorrect code selection. The documentation requirements for radiology studies are specific. The finalized radiology report must drive the claim, not the order.

Digital intake and clinical forms that capture the ordering provider’s clinical indication at the visit make it easier to pull at billing time.

• Clinical indication: the ordering provider’s note must document why imaging was medically necessary, not just that it was ordered
• View count confirmed in the radiology report: the final report must state the number of projections; coders should not assume from the order
• Laterality documented: the report must specify left or right wrist; “wrist” alone without laterality causes modifier LT/RT mismatches
• Ordering provider identified: the referring or ordering provider’s NPI must be present on the claim
• Interpreting radiologist signature: the interpreting physician must sign and date the final report
• Diagnosis linkage: the ICD-10 code must link logically to the clinical indication documented in the ordering provider’s note

Related CPT codes for upper extremity and wrist radiology

CPT code 73100 sits within a family of upper extremity plain-film codes. Practices billing wrist and hand imaging should have every one of them mapped in their billing system. That prevents inadvertent code substitution when the coder is working at speed.

The most important boundary is between 73100 and 73110, covered above. The second most important is between 73100 (wrist) and 73130 (hand). A wrist X-ray images the carpal bones and distal radius/ulna. A hand X-ray images the metacarpals and phalanges.

When an imaging order says “wrist and hand,” two separate codes may be appropriate. That requires documentation showing both anatomical sites were imaged with the requisite number of views. Review AAPC’s CPT code reference for descriptor-level clarification on adjacent codes in this range.

Common billing errors and how to avoid them

The errors below account for most denials and audit findings on wrist radiology claims. Each one is preventable with a documented internal check.

• Upcoding to 73110 when only 2 views were taken. Billing 73110 when the radiology report documents only two projections is healthcare fraud. Code from the finalized report, not from the order or the technician’s count at the time of the study.
• Omitting laterality modifiers (LT/RT). Many payers require LT or RT on wrist X-ray claims. A missing laterality modifier triggers an edit. The radiology report always specifies left or right; confirm before submitting.
• Incorrect TC/26 split in facility settings. Physicians billing the global code (no modifier) from a hospital outpatient department are typically denied because the facility has already billed for the technical component. Understand the billing arrangement before submitting.
• Missing clinical indication in the ordering note. “Wrist X-ray ordered” is not a clinical indication. The documentation must state why imaging was medically necessary, the symptom, mechanism, or clinical finding that prompted the order.
• Coding from the order rather than the final radiology report. Orders are requests, not billing documents. If the radiologist added a third view after the study, the code is 73110 regardless of what was ordered.
• Bundling errors with same-visit E/M services. When CPT 73100 is billed on the same day as an E/M visit for the same complaint, confirm that separate documentation supports both services. National Correct Coding Initiative (NCCI) edits govern which code pairs are appropriate to bill together.

Tracking denials by code shows whether 73100 rejections cluster around one modifier or one missing piece of documentation. Submitting a clean claim the first time removes the administrative cost of an appeal.

How Pabau simplifies wrist radiology billing

Most radiology billing errors happen between the point of care and the point of claim submission. Three causes come up repeatedly:

• The coder does not have the finalized view count.
• The modifier is chosen from memory instead of from a billing rule.
• The ICD-10 code is carried forward from a previous encounter.

Practice management software like Pabau closes all three by embedding CPT code selection, modifier assignment, and ICD-10 linking into the encounter itself. The claim is built during the visit instead of reconstructed hours later from notes.

Pabau’s first-pass claims management surfaces denial patterns by CPT code, so you can see whether 73100 rejections come from modifier omissions or laterality errors. The Claim.MD integration then supports billing end to end. Eligibility is verified before the visit, the claim goes out in the 837P format, and the remittance advice comes back for reconciliation.

Diagnosis coding sits in the encounter record too, so the ICD-10 code that drives the 73100 claim is documented alongside the clinical note. A biller no longer adds it afterwards from an incomplete record.

Reduce radiology billing denials with Pabau

Pabau links CPT codes, modifiers, and ICD-10 diagnoses within the patient encounter, so your claims leave the practice correctly coded the first time.

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Conclusion

CPT code 73100 has a narrow definition: exactly two views of the wrist. The costly errors around it are process failures, and three of them recur. Coders work from the order instead of the signed report, laterality modifiers get left off, and the TC/26 split is misapplied in facility settings. Fixing those three removes most 73100 denials.

Pabau connects CPT selection, modifier logic, and ICD-10 linking into one clinical workflow. The claim is accurate before it leaves the practice. To see how that works on radiology claims, book a demo.

Continue your research

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