CPT code 25310: Tendon transfer, RVU values and fee schedule

Key Takeaways

CPT code 25310 describes tendon transplantation or transfer (flexor or extensor) in the forearm and/or wrist, billed per tendon as a single unit each time.

RVU values include a work RVU of approximately 9.79, with total RVUs varying by facility vs non-facility setting; verify current figures via the CMS Physician Fee Schedule.

Modifiers 51 (Multiple Procedures), LT/RT (Laterality), and 59 (Distinct Procedural Service) are the most commonly applied modifiers; incorrect use triggers claim denial.

Pabau’s claims management software helps orthopedic and hand surgery practices apply modifiers accurately, update fee schedules in real time, and reduce claim denial rates.

The American Medical Association (AMA) publishes and maintains the CPT code set. According to the AMA, CPT code 25310 carries the following official descriptor:

The phrase “single, each tendon” in the descriptor is critical. It means CPT code 25310 is billed once per tendon transferred. If a surgeon transfers two tendons in the same operative session, two units of 25310 are billed, each with appropriate documentation confirming the distinct procedures.

Clinical indications: When is CPT code 25310 used?

CPT code 25310 applies when a surgeon transplants or transfers a flexor or extensor tendon in the forearm and/or wrist region. The code covers both transplantation (using a donor graft) and transfer (rerouting an existing tendon to restore function).

Common clinical scenarios include post-traumatic tendon rupture, rheumatoid arthritis complications, and nerve palsy deficits requiring tendon rerouting. Practices specializing in upper-extremity care, such as those using physical therapy EMR software or sports medicine software, encounter this code regularly.

• EIP to EPL transfer: Transfer of the extensor indicis proprius (EIP) to replace a ruptured extensor pollicis longus (EPL) tendon, most commonly following a distal radius fracture. This is one of the most frequently coded scenarios under CPT 25310.
• Rheumatoid arthritis reconstruction: Extensor tendon rupture secondary to rheumatoid disease, where multiple tendons may require transfer in a single session.
• Radial nerve palsy reconstruction: Flexor-to-extensor transfers restoring wrist and finger extension after high radial nerve injuries.
• Post-traumatic flexor tendon transfer: Restoration of digit flexion following crush injury or laceration where primary repair is not viable.
• Ulnar nerve palsy correction: Tendon transfers to restore intrinsic muscle function at the wrist level.

The code does NOT apply to tendon repairs (use CPT 25260 or 25270), tenodesis at the wrist (use CPT 25448), or procedures performed at the digit level (see the 26000-series codes). Getting the anatomical level right is the first step in avoiding downcoding or denial.

RVU values for CPT code 25310

The Centers for Medicare and Medicaid Services (CMS) sets relative value unit (RVU) data annually through the Medicare Physician Fee Schedule (MPFS). The table below reflects approximate 2026 values; always verify current figures through the CMS Physician Fee Schedule lookup tool before submitting claims.

Work RVU does not change between facility and non-facility settings, but practice expense RVU varies significantly. Use the FastRVU 2026 RVU lookup tool to cross-check locality-adjusted values for your specific geographic area.

CPT code 25310 fee schedule and reimbursement rates

Medicare reimbursement for CPT code 25310 depends on where the procedure is performed and the geographic adjustment factors applied by CMS. The national average figures above are a starting point, not a billing guarantee.

Facility vs non-facility rates

When CPT code 25310 is performed in a facility setting (hospital inpatient, hospital outpatient department, or ambulatory surgery center), the physician receives the lower facility rate because the institution separately bills for overhead. In a non-facility (office) setting, the physician absorbs overhead costs and receives a higher total RVU-based payment.

Medicare allowable and payer considerations

Medicare allowable amounts for CPT code 25310 vary by locality through geographic practice cost index (GPCI) adjustments applied by CMS. High-cost areas like New York City or San Francisco carry higher allowables than rural MAC localities.

Commercial payers negotiate rates independently. Most private insurers reference Medicare fee schedules at a percentage (commonly 110-140% of Medicare), but contracted rates differ significantly. Always check your specific payer contracts before projecting revenue for this procedure.

Pre-authorization requirements also vary by payer. No universal rule applies; verify prior auth requirements with each carrier before scheduling the surgery.

Modifiers for CPT code 25310

Modifier selection for CPT code 25310 directly affects whether a claim pays or denies. The table below summarizes the most commonly applied modifiers with guidance on when each is appropriate.

Modifier 51 is applicable at Tier 2 confidence; individual payer policies can override the standard multiple-procedure reduction rule. Always verify carrier-specific modifier rules before submission. Incorrect modifier application on CPT code 25310 claims is one of the top denial triggers for orthopedic billing teams.

ICD-10-CM codes commonly linked to CPT code 25310

Medical necessity for CPT code 25310 must be supported by a specific, appropriately coded diagnosis. The ICD-10-CM codes below represent the most common diagnostic crosswalk. Verify each code against the current-year tabular list before filing, as codes are revised annually.

Select the most specific code that reflects the documented clinical picture. Using non-specific “unspecified” codes when more precise options exist is a common audit flag. The AAPC Codify platform provides CPT-to-ICD-10 crosswalk references that can help coders confirm medical necessity pairing for CPT code 25310.

Related CPT codes: CPT code 25310 vs CPT 25448 and others

Choosing between closely related forearm and wrist tendon codes is a common source of coding errors. The table below compares CPT code 25310 with the codes most often confused with it. For additional procedural CPT code references, see other procedural CPT code references published by Pabau.

The most clinically important distinction is between 25310 (transfer/transplantation) and 25260/25270 (primary repair). A repair reattaches the original tendon end-to-end. A transfer reroutes a functioning tendon to a new insertion point. The operative note must clearly document which procedure was performed. Verify all related codes using the CMS list of CPT/HCPCS codes for annual coverage updates.

Billing and documentation requirements for CPT code 25310

Clean claims for CPT code 25310 hinge on the operative note. Payers audit hand surgery procedures for specificity, and incomplete documentation is the most common reason for post-payment recovery demands. Ensuring HIPAA compliance requirements for medical offices are met throughout documentation also reduces liability exposure.

• Per-tendon documentation: The operative report must identify each tendon transferred by name (e.g., EIP to EPL), confirming the donor and recipient sites. Billing two units of 25310 without naming two distinct tendons is an overbilling risk.
• Procedure type clarity: The note must distinguish transfer (rerouting) from transplantation (graft) and from repair (end-to-end). Using the terms interchangeably in the operative dictation creates ambiguity that payers exploit during audits.
• Anatomical level: Document that the procedure occurred at the forearm and/or wrist level, not at the digit level. Mislabeling anatomy shifts the correct code family entirely.
• Medical necessity: Link the procedure to the ICD-10-CM diagnosis code in the operative note. Payers increasingly require the indication to appear explicitly in the documentation, not just on the claim form.
• Pre-authorization status: Record the auth number in the billing file when prior authorization was obtained. Submitting without a required auth number triggers automatic denial at most commercial payers.
• Global period awareness: CPT 25310 carries a 90-day global surgical period. Services within the global period that are not separately identifiable require modifier 24 (unrelated E/M) or modifier 79 (unrelated procedure) to bypass the global edit.

Reviewing building a compliant medical practice can help practice administrators establish documentation workflows that support consistent coding accuracy across all surgical procedures, not just CPT code 25310.

Reduce claim denials for orthopedic procedures

Pabau’s claims management software helps hand surgery and orthopedic practices apply modifiers correctly, maintain updated fee schedules, and submit cleaner claims for CPT 25310 and related codes.

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How practice management software supports CPT 25310 billing

Orthopedic and hand surgery billing is procedurally complex. A single operative session involving multiple tendon transfers, a nerve procedure, and a fracture repair can generate four or more CPT codes, each requiring the right modifiers, the right fee schedule values, and complete ICD-10 linkage. Manual processes fail under that load.

Pabau’s claims management software is built for practices that need to move fast without sacrificing accuracy. The platform helps billing teams match CPT codes to current-year fee schedule values, flag modifier conflicts before submission, and track denial patterns across payers. Reviewing practice management software features used by high-performing orthopedic practices shows how integrated billing tools reduce rework time significantly.

• Fee schedule maintenance: Automatically update Medicare allowable amounts and payer contract rates when CMS releases annual MPFS data, reducing manual re-entry errors.
• Modifier rule engine: Flag potentially conflicting modifier pairs (e.g., modifier 51 combined with a procedure exempt from multiple-procedure reduction) before the claim leaves the practice.
• ICD-10 to CPT linkage: Link diagnosis codes to procedure codes at the point of charge entry, reducing the chance of a mismatched medical necessity code reaching the payer.
• Claim scrubbing: Run claims through real-time edits that catch the most common billing errors for surgical procedures before submission.
• Denial tracking: Monitor denial rates by CPT code and payer, so billing managers know when CPT code 25310 is being denied by a specific carrier and can investigate the root cause.

Practices exploring integrated billing and patient scheduling software often find that connecting scheduling, documentation, and billing in one platform significantly reduces the handoff errors that cause claim denials. For a broader view of features that drive operational efficiency, see features that save private practices time.

Practices also benefit from reviewing what choosing the right EHR for private practice requires when evaluating billing capabilities alongside clinical documentation.

Conclusion

CPT code 25310 is a per-tendon billing code that rewards accurate documentation. The most expensive mistakes in this code family are not errors in the OR; they are errors in the operative note and the billing form: a missing tendon name, the wrong modifier, an unlinked diagnosis code, or a fee schedule value that has not been updated since last year.

Pabau’s claims management platform helps orthopedic and hand surgery practices build the workflows that prevent those errors before they reach the payer. To see how Pabau handles surgical billing for high-complexity procedure codes, book a demo with the team.

Continue your research

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