Fusion · Hand

Surgical fusion of a metacarpophalangeal (MCP) joint, performed with or without internal fixation hardware.

Verified May 8, 2026 · 5 sources ↓

Medicare: $706.43
Work RVU: 6.96
Global, days: 90
Region: Hand

Drawn from CMSAAPCFindacodeEmedny

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify which MCP joint(s) was fused by digit number (e.g., index finger MCP, right hand)
Document whether internal fixation was used and identify the hardware type (K-wire, screw, plate)
Record the clinical indication: arthritis severity, deformity, prior conservative treatment failure
Note the surgical approach and technique used, including bone preparation and fusion technique
If autograft was NOT harvested, confirm 26850 applies rather than 26852
Document laterality (right, left, or bilateral) explicitly in the operative note

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 58 Staged or related 59 Distinct service 62 Co-surgeons 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 5 cited references ↓

CPT 26850 covers arthrodesis of the metacarpophalangeal joint — the knuckle where the metacarpal bone meets the proximal phalanx — with or without internal fixation. The surgeon eliminates motion at the joint to relieve pain or restore functional stability, typically in cases of severe arthritis, post-traumatic deformity, or chronic instability. Internal fixation (K-wires, screws, or plates) is included in the code when used; no separate hardware code is reportable. If autograft is harvested and used, report 26852 instead.

The 90-day global period means all routine post-op management through day 90 is bundled. New or unrelated problems billed in that window require modifier 24 (E/M) or 79 (unrelated procedure). Staged procedures on additional joints during the global period need modifier 58.

Multiple MCP fusions on the same hand at the same session are common in rheumatoid disease. For a second MCP joint fused on the same day, append modifier 51 to the additional procedure. For bilateral same-session fusions (right and left hands), use modifier 50 or separate LT/RT line items per payer instructions. Fluoroscopic guidance used intraoperatively to verify hardware position is typically considered part of the procedure and not separately billable under NCCI guidance.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (6.96) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (21.15) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	6.96
Practice expense RVU	12.87
Malpractice RVU	1.32
Total RVU	21.15
Medicare national rate	$706.43
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	$706.43
HOPD (APC 5114) Hospital outpatient department	$7,413.38
ASC (PI A2) Ambulatory surgical center (freestanding)	$3,695.53

Common denial reasons

The recurring reasons claims for CPT 26850 get rejected.

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

Laterality missing or ambiguous — payer downcodes or rejects without LT/RT designation
26852 billed when autograft was not actually harvested, or 26850 billed when it was
Multiple MCP fusions reported without modifier 51, triggering unbundling edit
Post-op E/M visits billed in the 90-day global without modifier 24 citing a new/unrelated condition
Fluoroscopy billed separately when it is bundled into the intraoperative procedure under NCCI rules

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01When should I bill 26852 instead of 26850?

Bill 26852 when autograft is harvested and used to augment the fusion. 26850 covers the arthrodesis with or without internal fixation hardware, but autograft harvest tips you to the higher-value 26852. Allograft is not an autograft; if only allograft is used, stay with 26850.

02Can I bill 26850 twice if I fuse two MCP joints on the same hand same day?

Yes. Report 26850 for the primary joint and 26850 with modifier 51 for the additional joint. Some payers may require distinct digit identification in the claim notes. If both fusions were equally complex, document that clearly.

03Is intraoperative fluoroscopy separately billable with 26850?

Generally no. NCCI policy bundles intraoperative fluoroscopy used to verify hardware position into the primary musculoskeletal procedure. Do not separately report a fluoroscopy code unless it represents a distinct, separately documented service.

04What modifier applies if the surgeon returns to the OR during the global period for a wound complication at the fusion site?

Use modifier 78 — unplanned return to the OR for a complication related to the original procedure. Modifier 79 is for unrelated procedures. Inverting these is an audit flag and a common denial trigger.

05Does the 90-day global period block billing for therapy or injections at the same joint?

Routine post-op services are bundled, but a separately identifiable injection or treatment at a different anatomic site can be reported with modifier 79 (unrelated). If the service is genuinely unrelated to the fusion and at a different site, document that clearly. Payers vary on how aggressively they enforce this, so check LCD policies for your MAC.

06How do I bill bilateral MCP fusions (right and left hand) performed in the same session?

Report 26850 on one line with modifier 50, or on two lines with LT and RT respectively. Check individual payer preference — Medicare generally accepts the modifier 50 single-line approach, but some commercial payers want separate lines. Reimbursement is typically capped at 150% of the single-procedure fee.

Sources & references

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

Mira Scribe

Mira's AI scribe captures digit number, laterality, fixation hardware type, fusion technique, and whether autograft was used — directly from the surgeon's dictation. That specificity prevents the two most common 26850 denials: missing laterality and wrong code selection between 26850 and 26852.

See how Mira captures CPT 26850 documentation