Arthroscopy · Hand

Diagnostic arthroscopy of the metacarpophalangeal (MCP) joint, including synovial biopsy when performed.

Verified May 8, 2026 · 8 sources ↓

Medicare: $494.00
Total RVUs: 14.79
Global, days: 90
Region: Hand

Drawn from CMSAAPCMdclarityCoderoncallAAOS

Documentation requirements

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

Source · Editorial brief grounded in 8 cited references ↓

Specify which MCP joint was scoped (e.g., index finger MCP, long finger MCP) and laterality (left vs. right).
Document the clinical indication and why non-invasive imaging was insufficient to establish the diagnosis.
If synovial biopsy was obtained, document specimen collection, handling, and pathology submission.
Confirm the procedure was purely diagnostic; if any surgical intervention was performed, document separately and select the appropriate surgical arthroscopy code.
Operative note must name the arthroscopic approach and describe joint findings in detail — 'within normal limits' or 'standard approach' invites audit flags.
Record anesthesia type, tourniquet use, and post-procedure joint assessment to support medical necessity under the 90-day global.

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 52 Reduced services 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 8 cited references ↓

CPT 29900 covers arthroscopic examination of a metacarpophalangeal joint — the knuckle joints connecting the hand to the fingers — for diagnostic purposes, including synovial tissue sampling when indicated. It is used to evaluate joint pathology such as inflammatory arthritis, traumatic injury, or unexplained synovitis when imaging alone is inconclusive. This is a diagnostic code; if surgical intervention is performed during the same session, a surgical arthroscopy code takes precedence.

The 90-day global period means all routine follow-up care through day 90 is bundled. Any unrelated E/M visits in that window need modifier 24; unrelated procedures need modifier 79. Per NCCI policy, if the diagnostic arthroscopy leads to conversion to an open procedure, only the open procedure code is reportable — neither the diagnostic nor surgical arthroscopy code stacks on top.

Fluoroscopy performed during the arthroscopic procedure is integral and cannot be billed separately. Debridement performed in the same joint at the same encounter is also bundled unless it occurs in a distinct, unrelated joint. MCP joints are bilateral structures; use LT/RT to designate laterality, or modifier 50 for a true bilateral procedure billed on a single line per payer convention.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	5.73
Practice expense RVU	7.83
Malpractice RVU	1.23
Total RVU	14.79
Medicare national rate	$494.00
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	$494.00
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 29900 get rejected.

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

Lack of medical necessity: payer requires documented failure of conservative treatment and supporting imaging before authorizing diagnostic arthroscopy.
Missing laterality: claims submitted without LT or RT modifier are routinely rejected by Medicare and many commercial payers.
Upcoding or unbundling: separately billing fluoroscopy or debridement performed in the same MCP joint at the same encounter violates NCCI bundling rules.
Conversion to open procedure billed alongside 29900: if the case converted to open, only the open code is payable — the diagnostic arthroscopy cannot be stacked.
Diagnosis-procedure mismatch: ICD-10 codes that don't support joint-level arthroscopic evaluation (e.g., a purely soft-tissue or tendon diagnosis without joint involvement) trigger automatic review.

Frequently asked questions

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

01Can 29900 be billed same-day with a surgical arthroscopy of the same MCP joint?

No. NCCI policy requires that when a diagnostic arthroscopy leads directly to a surgical arthroscopy on the same joint at the same encounter, only the surgical arthroscopy code is reportable. 29900 is absorbed into the surgical procedure.

02What modifier is required for laterality on 29900?

Use LT or RT to identify which hand. For a true bilateral MCP arthroscopy at the same session, bill on two lines with LT and RT, or use modifier 50 per your payer's preference — confirm with the payer before submitting.

03Is fluoroscopy separately billable when used during 29900?

No. Per NCCI policy, fluoroscopy performed during any arthroscopic procedure is integral to the arthroscopy and cannot be billed separately.

04What global period applies to 29900, and what does that mean for post-op visits?

29900 carries a 90-day global period. Routine follow-up visits, dressing changes, and stitch removal through day 90 are bundled. Bill unrelated E/M visits in that window with modifier 24, and unrelated procedures with modifier 79.

05If 29900 is converted to an open procedure intraoperatively, what gets billed?

Only the open procedure code. NCCI is explicit: when an arthroscopic procedure converts to open, neither the diagnostic nor surgical arthroscopy code is reported alongside the open procedure code.

06Can synovial biopsy be billed separately when performed during 29900?

No. Synovial biopsy obtained during the diagnostic arthroscopy is included in 29900 and is not separately reportable at the same joint encounter.

07Which ICD-10 diagnoses typically support medical necessity for 29900?

Inflammatory arthropathy of the MCP joint (e.g., M06.841–M06.849), post-traumatic synovitis, or unspecified MCP joint pain/swelling with inconclusive prior imaging are the most defensible. The diagnosis must clearly point to the MCP joint, not a tendon or soft-tissue structure alone.

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 operated on, laterality, the arthroscopic findings dictated intraoperatively, whether synovial biopsy was obtained, and the surgeon's explicit statement that the procedure was diagnostic rather than therapeutic. This prevents the most common audit flag for 29900 — an operative note that fails to justify diagnostic intent or omits the joint-level detail needed to defend medical necessity on post-payment review.

See how Mira captures CPT 29900 documentation