Wrist arthroscopy performed specifically to treat an active joint infection, including irrigation of the joint space and drainage of purulent or infected material.

Documentation requirements

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

Source · Editorial brief grounded in 8 cited references ↓

• Confirmed or suspected diagnosis of septic arthritis or wrist joint infection with supporting clinical findings, lab values, or prior aspiration results
• Operative note specifying portals used by name (e.g., 3-4, 6R, 6U, radiocarpal) — notes that list only 'standard portals' are an audit flag
• Description of irrigation volume and technique, nature of the infected material encountered, and confirmation that drainage was achieved
• Laterality documented (right vs. left wrist) to support RT or LT modifier on the claim
• Pre- and post-operative diagnoses matching the ICD-10 code billed, with infectious etiology specified where known
• Distinction from any concurrent wrist procedures; if additional work was performed, document each step separately to support additional CPT codes or modifier 59/XS

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

What this code covers

Source · Editorial summary grounded in 8 cited references ↓

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

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

Common denial reasons

The recurring reasons claims for CPT 29843 get rejected.

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

• Missing or unsupported infectious diagnosis — payers deny 29843 when the operative indication documented is degenerative or traumatic rather than infectious
• Laterality modifier absent — claims without LT or RT are flagged for edit or returned by many payers and Medicare contractors
• Unbundling conflict when 29843 is billed same-day with 29840 (diagnostic wrist arthroscopy), which is a component of the surgical procedure
• Global period violation — E/M or procedure claims submitted during the 90-day postoperative period without appropriate modifiers 24, 25, 78, or 79
• Medical necessity not established — insufficient pre-operative documentation (e.g., no lab evidence, no aspiration culture, no imaging) to justify surgical lavage over conservative management