CPT code 25447 – Intercarpal or CMC interposition arthroplasty

Key takeaways

CPT Code 25447 covers intercarpal or carpometacarpal (CMC) joint arthroplasty with interposition, such as a tendon graft, and no suspension.

Since 2025, suspension arthroplasty of the same joints, with tendon transfer or transplant, is reported with CPT 25448 and never alongside 25447.

The RUC recommended a work RVU of 11.14 for 25447 and 13.90 for 25448. Confirm current payment in the CMS fee schedule lookup.

Modifier -LT or -RT is required for laterality. Modifier -47 (anesthesia by surgeon) is payer-dependent, so confirm it before appending.

Pabau, the practice management and billing platform we build, submits 25447 claims electronically through its Claim.MD clearinghouse integration.

CPT Code 25447: Official descriptor and procedure overview

CPT Code 25447 is the code for arthroplasty, intercarpal or carpometacarpal joints; interposition (eg, tendon). The American Medical Association maintains it in the Musculoskeletal System section of the CPT code set, among the forearm and wrist repair codes.

The surgeon removes the arthritic joint surface, most often by excising the trapezium at the base of the thumb. Tissue such as a rolled tendon graft then fills the gap to keep the bones apart. The code was revised for CPT 2025 to make clear that it covers interposition only, not suspension.

The 90-day global period means that routine follow-up visits within 90 days of the surgery are bundled into the procedure payment. Payers will reject separately billed E/M visits during that window unless a significant separate service is documented and a modifier appended.

What procedures does CPT Code 25447 cover?

CPT Code 25447 covers arthroplasty at an intercarpal or CMC joint when the surgeon places interposition material in the joint space without a suspension. The most common clinical scenario is thumb basal joint arthritis. Destruction of the first CMC joint leaves the patient with chronic pain and grip weakness that conservative care has not relieved.

Procedures billed under 25447 include:

• Trapeziectomy with tendon interposition: excision of the trapezium, with a tendon graft placed in the gap and no suspension of the thumb metacarpal. This is the most common use of 25447.
• Interposition arthroplasty at a finger CMC joint: the same resection-and-interposition technique at the base of a finger metacarpal.
• Intercarpal interposition arthroplasty: resection with interposition at a joint between two carpal bones, such as the scaphotrapeziotrapezoid (STT) joint.

Several nearby procedures fall outside 25447:

• Suspension arthroplasty: ligament reconstruction and tendon interposition (LRTI), or any technique that transfers a tendon to suspend the metacarpal, is CPT 25448.
• Trapeziectomy alone: excision of the trapezium with no interposition is reported with CPT 25210.
• Prosthetic replacement: a trapezium implant is CPT 25445, and interphalangeal joint arthroplasty is CPT 26535 or 26536.
• Wrist arthroplasty: the radiocarpal joint is coded with 25332 or, for total wrist replacement, 25446.

The operative report must name the joint and describe what was placed in the joint space. If a tendon was transferred or used to suspend the metacarpal, the case belongs under 25448. The chart below matches each description in the note to the code it supports.

CPT Code 25447 vs. CPT Code 25448: Key differences

CPT 25447 and CPT 25448 cover the same intercarpal and carpometacarpal joints. They differ only by surgical technique. CPT 25447 is interposition alone, while 25448 adds a suspension using a transferred or transplanted tendon.

CPT 25448 is new for 2025. The CPT Editorial Panel created it after a RUC screen found a pattern. About 80% of the time, 25447 was reported with a tendon transfer code such as 25310 or 26480. Surgeons were billing suspension work as two codes, and the new code bundles it into one.

Pick the code from the operative note, not the diagnosis. Both codes pair with the same ICD-10 codes, so diagnosis edits rarely catch a technique mismatch. A records review will. If the note describes a tendon slip used to suspend the metacarpal, the claim is 25448.

CPT codes commonly billed with or confused with 25447

Several adjacent codes appear in the same hand surgery billing context as CPT Code 25447. Some are billed instead of 25447, some alongside it with a modifier, and some are bundled into it under CMS’s National Correct Coding Initiative edits.

Carpal tunnel release (64721) is the most common separately payable procedure in the same session as thumb CMC arthroplasty. The operative report must document each procedure as a distinct service. Append modifier -59, or XS where the payer requires it, when an NCCI edit pairs the two codes.

Modifiers that apply to 25447

Modifiers for CPT Code 25447 govern laterality, multiple procedures, distinct services, and the unusual situation where the operating surgeon also administers anesthesia. Applying the wrong modifier, or omitting a required one, is a frequent reason this code is denied.

Modifier -47 deserves particular caution. Medicare does not pay for anesthesia provided by the operating surgeon, so the surgeon cannot bill it separately under Medicare rules. Commercial payer acceptance varies. Confirm each payer’s policy individually before appending -47 to CPT Code 25447 claims.

Medicare reimbursement and RVU values

The CMS Medicare Physician Fee Schedule sets the national reimbursement benchmarks for CPT Code 25447. Rates are adjusted annually and vary by locality through CMS’s Geographic Practice Cost Index (GPCI). Always verify the current year’s rate through the CMS lookup tool before billing.

The work RVUs below come from the RUC’s review of the CMC arthroplasty family for CPT 2025. Most cases take place in a hospital outpatient department or an ambulatory surgery center, so the facility rate usually applies.

The two codes sit 2.76 work RVUs apart, so the technique recorded in the note moves the payment. Billing 25447 for a suspension case underpays the surgeon. Billing 25448 for an interposition-only case overstates the work and invites recoupment.

Use the FastRVU lookup tool to retrieve current work, practice expense, and malpractice RVUs for CPT Code 25447 by locality. The AMA/Specialty Society Relative Value Scale Update Committee (RUC) sets its work RVU recommendation from physician time and work intensity. Practice managers use the figure to model revenue per surgical case.

Payer coverage policies and prior authorization requirements

Most commercial payers require prior authorization before approving CPT Code 25447 claims. Following the payer’s prior authorization process for surgery matters, because a missing authorization number is an automatic denial however well the claim is coded.

Medicare does not routinely require prior authorization for 25447, but commercial payers including UnitedHealthcare, Aetna, and BCBS plans typically do. Requirements vary by plan and region. Below are the documentation elements most payers request:

• Diagnosis codes with laterality: M18.11 or M18.12 for primary first CMC osteoarthritis of the right or left hand. Use M18.0 for bilateral disease, or the matching secondary M18 code.
• Conservative treatment history: documented trial of 3-6 months of conservative management including NSAIDs, splinting, corticosteroid injections, and occupational therapy.
• Imaging evidence: X-rays showing CMC joint space narrowing, osteophyte formation, or advanced arthritic changes. Many payers require AP, lateral, and stress views.
• Functional limitation documentation: objective description of impaired grip strength, pinch strength, or activities of daily living impact.
• Physician clinical notes: at least two office visit notes within the prior 12 months documenting progressive disease course.

Request authorization for the technique the surgeon plans to use. An approval for 25447 does not cover a 25448 suspension, so confirm the plan before submitting the request. If the surgeon changes technique in the operating room, contact the payer about updating the authorization.

State Medicaid programs have their own coverage policies for CPT Code 25447, which vary significantly. Some require extra pre-authorization steps. Verify coverage against the state Medicaid fee schedule before scheduling a Medicaid patient for CMC arthroplasty.

ICD-10 diagnosis codes that support medical necessity

Selecting the correct ICD-10-CM diagnosis code is critical for establishing medical necessity and passing clean-claim edits. For CPT Code 25447, the ICD-10 code must specify the affected joint and laterality. The M18 category covers osteoarthritis of the first CMC joint and accounts for most 25447 claims.

Always code to the highest specificity available. Unspecified codes such as M18.9 will trigger medical necessity flags with most payers. The operative report and pre-operative notes must reflect the same laterality as the diagnosis code on the claim.

Documentation the operative report needs

The operative report is the single most important document for CPT Code 25447 claims. It must show that the procedure performed matches the code billed, with enough detail for a payer reviewer to confirm medical necessity. Practices focused on medical billing compliance treat the op report as the claim’s primary defense.

Required elements for the operative report include:

• Anatomical site: explicit naming of the joint (e.g., “first carpometacarpal joint, right hand”) rather than a generic reference to “the thumb.”
• Interposition material: what was placed in the joint space, such as a rolled tendon graft, and where it came from.
• Suspension statement: whether any tendon was transferred or used to suspend the metacarpal. If one was, the case is 25448, not 25447.
• Surgical technique: enough detail to separate arthroplasty from other procedures, such as thumb CMC arthrodesis (26841 or 26842).
• Medical necessity narrative: a brief statement linking the procedure to the clinical indication, conservative treatment failure, and expected functional outcome.
• Laterality confirmation: explicit right or left designation matching the modifier and ICD-10 code on the claim.

For submitting clean claims, keep the pre-operative documentation package with the claim when prior authorization was obtained. Payers may request the approval letter, the supporting clinical notes, and post-operative notes during an appeal.

Common denial reasons and how to avoid them

Denials on CPT Code 25447 cluster around four root causes: wrong code selection, prior authorization failures, thin operative notes, and modifier errors. Effective denial management workflows address each root cause separately rather than treating every denial as one problem.

Common medical billing denial codes on 25447 claims include CO-4 (inconsistent modifier), CO-197 (authorization absent), and CO-50 (not medically necessary). Each requires a distinct appeal. CO-197 appeals need the authorization approval, and CO-50 appeals need a necessity letter from the surgeon.

How practice management software streamlines CPT 25447 billing

In many hand surgery practices, a coder rebuilds each 25447 claim from the operative note by hand. Someone then checks its status in a payer portal and logs the result in a spreadsheet. Each hand-off is another chance to drop a laterality modifier or miss a technique change.

Pabau removes those hand-offs. Its claims management software pre-fills each claim from the codes, modifiers, and diagnoses already on the patient record. Claims then go to payers through its Claim.MD clearinghouse integration, which also checks eligibility in real time.

Claim status and remittances flow back into the same record. A short-paid or denied 25447 claim shows up while there is still time to correct or appeal it. Choosing between 25447 and 25448 stays with your coders, backed by the documentation habits above.

Streamline surgical billing with Pabau

Pabau pre-fills claims from the patient record, submits them through Claim.MD, and tracks status and remittances. Hand surgery practices spot a denied 25447 claim while there is still time to appeal.

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Conclusion

CPT 25447 is now an interposition-only code. Read the operative note for a tendon transfer or suspension before coding the case. If one is there, the claim is 25448, billed on its own.

The fix sits upstream of the billing team. An op note template that asks the surgeon to name the interposition material and state whether a suspension was done settles the code early. It also keeps the prior authorization aligned with the surgery performed.

The trade-off is one more line in the dictation in exchange for fewer recoupments on a 90-day global code. Book a demo to see how Pabau tracks hand surgery claims from submission to remittance.

Continue your research

Need to understand how clearinghouse submission works? Medical claims clearinghouse guide explains how electronic claim routing reduces denial rates and speeds up reimbursement for surgical codes.

Want to see the full superbill workflow? Superbill guide covers how to structure a compliant superbill that supports clean-claim submission for procedure codes including CPT 25447.

Looking to verify eligibility before scheduling surgery? Insurance eligibility verification details the real-time eligibility check process that flags prior authorization requirements and coverage limits before the patient reaches the OR.

Frequently asked questions