Arthroscopy · Hand

Surgical arthroscopy of the metacarpophalangeal joint with debridement of the affected MCP joint in the hand.

Verified May 8, 2026 · 6 sources ↓

Medicare: $523.73
Total RVUs: 15.68
Global, days: 90
Region: Hand

Drawn from CMSAAPCEmednyFindacode

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify which MCP joint(s) were treated and the laterality (left, right, or bilateral).
Document the indication for surgery with a supporting ICD-10 diagnosis code tied directly to the MCP joint.
Operative note must name the arthroscopic findings (e.g., synovitis, loose bodies, cartilage damage) and confirm debridement was performed — not just 'standard debridement.'
If a diagnostic arthroscopy preceded the surgical decision, document that the surgical plan was determined intraoperatively based on those findings.
Record that joint irrigation and portal access were performed; these are bundled and should not appear as separate line items.
Note any conversion to open procedure, as this changes the reportable code entirely.

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 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician 78 Unplanned return — related 79 Unrelated during global LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 29901 covers surgical arthroscopy of the metacarpophalangeal (MCP) joint — the knuckle joint at the base of the finger — with debridement. The surgeon introduces an arthroscope into the joint, evaluates the intra-articular structures, and removes damaged tissue, loose bodies, or other debris impeding joint function. The diagnostic evaluation is inherently included; never report 29900 alongside 29901 for the same joint in the same session.

The code carries a 90-day global period. All routine post-op care, dressing changes, and follow-up visits through day 90 are bundled. Anything unrelated to the MCP arthroscopy billed during that window requires modifier 24 (E/M) or 79 (unrelated procedure). A return to the OR for a complication tied to the original procedure uses modifier 78.

When multiple MCP joints are treated in the same session, laterality modifiers LT and RT identify which hand; modifier 50 applies if both hands are treated simultaneously under truly bilateral circumstances. If an arthroscopic approach is abandoned and converted to open surgery, bill only the open procedure code — reporting both is unbundling per NCCI Chapter IV.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	6.43
Practice expense RVU	7.9
Malpractice RVU	1.35
Total RVU	15.68
Medicare national rate	$523.73
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	$523.73
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 29901 get rejected.

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

Billing 29900 (diagnostic) and 29901 (surgical) together for the same MCP joint in the same session — surgical always includes diagnostic.
Missing or non-specific laterality when payer policy requires LT or RT modifier on hand procedures.
Unbundling portal placement, joint irrigation, or simple synovectomy as separate line items — these are integral to 29901 and not separately payable.
Diagnosis code does not support MCP joint pathology requiring surgical intervention, triggering medical necessity denial.
Reporting 29901 with an open arthrotomy code for the same joint without modifier 51 or appropriate NCCI modifier when required by the payer.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01Can I bill 29900 and 29901 together when the surgeon performed a diagnostic look before debriding?

No. A surgical arthroscopy always includes the diagnostic evaluation of that joint. Report only 29901. Billing 29900 alongside it for the same joint in the same session is unbundling and will be denied or recouped.

02If the surgeon treats MCP joints on both hands in the same session, how do I bill?

Bill 29901-50 for a true bilateral procedure performed in the same session, or use 29901-LT and 29901-RT on separate lines with modifier 51 on the second line, depending on your payer's preference. Confirm which approach your MAC or commercial payer requires before submitting.

03What modifier applies if the patient returns to the OR during the 90-day global for an MCP joint infection related to the original surgery?

Use modifier 78 — unplanned return to the OR for a procedure related to the original surgery within the global period. Do not use modifier 79; that is reserved for unrelated procedures during the post-op window.

04The arthroscopy was converted to an open procedure mid-case. Do I bill both?

No. Bill only the open procedure code. Reporting the abandoned arthroscopic attempt alongside the successful open surgery is unbundling per NCCI Chapter IV guidelines. Document the conversion clearly in the operative note.

05Is a same-day E/M billable with 29901 if the surgeon saw the patient in the office before the procedure?

Only if the E/M was a significant, separately identifiable service beyond standard pre-procedure evaluation. If so, append modifier 25 to the E/M code. Routine pre-op assessments are bundled into the global package and are not separately billable.

06Where is 29901 typically performed, and does site of service affect reimbursement?

29901 is performed in HOPD or ASC settings. The HOPD and ASC facility payments differ — see the Site of Service comparison table on this page. Physician work RVUs are the same regardless of site, but the facility component varies significantly.

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 specific MCP joint treated, laterality, arthroscopic findings, and the nature of debridement performed from the surgeon's dictation. It flags whether the procedure was diagnostic-only versus surgical, and whether multiple joints or both hands were addressed. This prevents the most common denial triggers: missing laterality, vague operative findings, and incorrect pairing of 29900 with 29901 for the same joint.

See how Mira captures CPT 29901 documentation