Opponensplasty procedure transferring a tendon to restore opposition function of the thumb — the thumb's ability to move across the palm and meet the fingertips.

Verified May 8, 2026 · 8 sources ↓

Medicare: $880.78
Total RVUs: 26.37
Global, days: 90
Region: Hand

Drawn from CMSAAPCMdclarityAAOSEatonhand

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 8 cited references ↓

Identify the specific donor tendon used (e.g., palmaris longus, FDS ring finger, extensor indicis proprius) and confirm it was harvested during this operative session.
Describe the pulley construction or routing path used to redirect the tendon for opposition — vague operative notes that omit this step are a common audit flag.
Document the insertion point on the thumb (e.g., abductor pollicis brevis, proximal phalanx base) and method of fixation (suture anchor, weave, direct repair).
State the clinical indication: median nerve palsy, thenar atrophy, trauma, or prior failed opponensplasty — ICD-10 must align with the tendon transfer rationale.
Record intraoperative confirmation of restored opposition arc before wound closure; this supports medical necessity and distinguishes reconstruction from simple repair.
If a graft was obtained remotely (e.g., plantaris, toe extensor), note harvest site separately — additional graft harvest codes may apply and require their own documentation.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 50 Bilateral procedure 51 Multiple procedures 57 Decision for surgery 58 Staged or related 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side XS Separate structure

What this code covers

Source · Editorial summary grounded in 8 cited references ↓

CPT 26496 covers opponensplasty, a reconstructive hand surgery in which a tendon — commonly the palmaris longus, flexor digitorum superficialis, or extensor indicis proprius — is transferred and rerouted to restore the thumb's opposition function. Opposition is the biomechanical cornerstone of hand function; its loss from median nerve injury, trauma, or congenital deficit dramatically impairs grip and pinch strength. This is a major procedure with a 90-day global period.

The surgery is performed almost exclusively by hand surgeons and requires precise operative documentation: the donor tendon harvested, the pulley or routing used, the insertion point on the thumb, and confirmation that opposition was restored. Opponensplasty is not a simple tendon repair — it is a reconstruction involving tendon harvest, routing, and fixation, which distinguishes it from lower-complexity thumb tendon procedures in the 26480–26489 range.

If a same-day carpal tunnel release or nerve repair is performed, confirm NCCI PTP edit status before billing both codes. Any additional procedures during the same session need modifier 51 or 59/XS with documented distinct indications. A return to the OR for a related complication within the 90-day global uses modifier 78; an unrelated procedure in the same window uses modifier 79.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	9.54
Practice expense RVU	14.79
Malpractice RVU	2.04
Total RVU	26.37
Medicare national rate	$880.78
Global period	90 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$880.78
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 26496 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

ICD-10 mismatch: a diagnosis code reflecting only laceration or tendon injury without documenting loss of opposition function fails to justify a tendon transfer.
Bundling denial when 26496 is billed same-day with a carpal tunnel release or other hand procedure without checking NCCI PTP edits and appending modifier 59 or XS where permitted.
Operative note describes a 'standard tendon transfer' without naming donor tendon, routing, or insertion — insufficient specificity triggers medical necessity review or denial.
Missing modifier 57 when the decision for surgery was made the day before or day of the procedure during an E/M visit billed in the global window of a prior procedure.
Modifier 78 and 79 confusion: billing a return for a related complication (e.g., tendon rupture repair) with modifier 79 instead of 78 triggers edit rejection.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 8 cited references ↓

01What is the global period for CPT 26496, and what does it cover?

26496 carries a 90-day global period. That covers the surgery itself, the day-before preoperative visit, and all routine post-op care through day 90. Separate E/M visits during that window require modifier 24 if unrelated to the thumb reconstruction.

02Can 26496 be billed bilaterally?

Bilateral opponensplasty is rare but possible when both thumbs have lost opposition function. Append modifier 50 and expect a 150% payment calculation. Document separate clinical indications for each thumb in the operative report.

03When should modifier 22 be used with 26496?

Use modifier 22 when the procedure is substantially more work than typical — for example, a revision opponensplasty in a scarred field after prior tendon transfer failure, or an unusually complex routing requiring pulley reconstruction. The operative note must describe the specific factors that increased difficulty; generic language won't support the upcharge.

04Can a same-day carpal tunnel release be billed with 26496?

It depends on NCCI PTP edits — check the current edit table before billing both. If the codes are an edit pair, modifier 59 or XS is required and must be supported by documentation that the carpal tunnel release was a distinct, separately indicated procedure performed through a separate incision or distinct surgical site.

05What modifier applies if the patient returns to the OR during the 90-day global for a ruptured opponensplasty tendon?

Modifier 78 — unplanned return to the OR for a procedure related to the original surgery. Do not use modifier 79 here; that is reserved for unrelated procedures. Confusing these two is an edit trigger that can result in denial or overpayment recoupment.

06Is modifier 51 required when 26496 is performed with other hand procedures in the same session?

Append modifier 51 to the lower-valued secondary procedure when billing multiple surgeries in the same session, unless the secondary code is exempt from modifier 51. CMS applies a multiple procedure reduction to the second and subsequent procedures; confirm which code is primary based on relative RVU value.

07What ICD-10 codes typically support 26496?

Diagnoses reflecting loss of thumb opposition drive medical necessity — including sequelae of median nerve injury, thenar muscle atrophy, traumatic tendon disruption, and congenital thumb hypoplasia. A diagnosis of simple tendon laceration without functional deficit documentation is frequently insufficient on its own for a transfer procedure.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures the donor tendon name, harvest method, pulley or routing path, insertion point on the thumb, and the surgeon's intraoperative confirmation of opposition restoration — all from dictation. That specificity prevents the most common audit trigger for 26496: an operative note that documents a tendon transfer occurred but omits the anatomical detail reviewers need to confirm a reconstruction rather than a simple repair was performed.

See how Mira captures CPT 26496 documentation