Arthroscopy · Knee

Knee arthroscopy with surgical debridement or shaving of articular cartilage (chondroplasty) — does not include meniscal work.

Verified May 8, 2026 · 6 sources ↓

Medicare: $586.85
Total RVUs: 17.57
Global, days: 90
Region: Knee

Drawn from CMSAAPCNIHFastrvu

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify the knee compartment(s) treated (medial, lateral, patellofemoral) — compartment documentation is required to distinguish 29877 from G0289
Grade the chondral damage using a recognized classification system (Outerbridge or ICRS) to justify surgical necessity
Document that chondroplasty was the primary surgical objective, not incidental cleanup during a concurrent procedure
Name the instruments used (motorized shaver, hand rasp) and describe the cartilage surface before and after treatment
Confirm no meniscal procedures were performed — if meniscectomy was also done, 29877 is bundled and G0289 applies for separate-compartment work
Record laterality (left or right knee) and affix LT or RT modifier on the claim

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 29877 covers arthroscopic debridement or shaving of articular cartilage (chondroplasty) of the knee as a standalone surgical procedure. The surgeon accesses the joint through small portals, visualizes the articular surface, and mechanically smooths or removes damaged cartilage to reduce symptoms from chondral wear or focal lesions. This code applies when chondroplasty is the primary or sole surgical service performed in that compartment.

The NCCI bundling rules for this code are strict and frequently misapplied. Per the CMS NCCI Policy Manual, 29877 cannot be reported alongside any other knee arthroscopy code in the 29866–29889 range — not with a modifier, not with documentation of separate work. When debridement is performed in a different compartment from the primary arthroscopic procedure, the correct code is G0289, not 29877. This distinction is one of the most common sources of claim denial and RAC audit exposure for orthopedic practices.

The code carries a 90-day global period. Chondroplasty performed incidentally during a meniscectomy (29880 or 29881) is not separately reportable — it is considered inclusive by code description. If 29877 is the only procedure performed and chondroplasty is documented as the distinct surgical objective, it stands alone. Document the compartment treated, the degree of chondral damage by Outerbridge or ICRS grade, and the technique used (motorized shaver, hand instruments). Payers and auditors will scrutinize whether the debridement was truly the primary work or an incidental step bundled into a more complex procedure.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	8.09
Practice expense RVU	7.82
Malpractice RVU	1.66
Total RVU	17.57
Medicare national rate	$586.85
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	$586.85
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 29877 get rejected.

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

29877 billed alongside 29880 or 29881 — chondroplasty is inclusive to meniscectomy codes and cannot be unbundled
29877 reported instead of G0289 when debridement was performed in a different compartment from the primary arthroscopic procedure
Medical necessity denied when operative note does not specify cartilage grade or documents debridement only as incidental joint cleanup
Laterality modifier (LT/RT) missing, triggering claim suspension or rejection by payer edits
29877 billed with 29875 or 29876 on the ipsilateral knee — NCCI prohibits these combinations without an overriding exception

Frequently asked questions

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

01Can 29877 be billed with a meniscectomy (29880 or 29881)?

No. Chondroplasty is inclusive to the meniscectomy code descriptions. Billing 29877 alongside 29880 or 29881 will be denied or recouped. If debridement was performed in a separate compartment from the meniscectomy, use G0289 instead.

02When should G0289 be used instead of 29877?

Use G0289 when debridement or chondroplasty is performed in a different compartment from the primary arthroscopic procedure. G0289 is the Medicare-specific code designed for that scenario. 29877 is reserved for cases where chondroplasty is the only or primary surgical service.

03Can 29877 and 29875 be billed together on the same knee?

No. CPT 29875 is designated a 'separate procedure' and cannot be reported with any other arthroscopic knee code on the ipsilateral knee. Billing both will trigger an NCCI edit denial.

04Does 29877 carry a global period, and what does that mean for post-op visits?

Yes — 29877 has a 90-day global period. All routine post-operative visits, dressing changes, and stitch removals within 90 days are bundled. Unrelated E/M services during that window require modifier 24; related E/M on the same day as surgery requires modifier 25.

05Is modifier 59 ever appropriate with 29877?

Rarely, and not to bypass the 29877 + 29880/29881 bundle — NCCI is explicit that 29877 cannot be reported with other knee arthroscopy codes at all, modifier or no modifier. Modifier 59 may apply in narrow scenarios involving truly distinct procedures on contralateral knees or unrelated anatomic sites on the same date.

06What ICD-10 diagnoses best support 29877?

Chondromalacia codes (M94.26x for the knee) and focal articular cartilage defect codes (M93.9x, M22.4x) are the strongest supports. Osteoarthritis codes can support the diagnosis but increase scrutiny given evidence debates around arthroscopic debridement for OA — ensure the operative note reflects a distinct chondral lesion, not generalized joint degeneration.

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 knee compartment treated, the Outerbridge or ICRS cartilage grade, the instruments used, and an explicit statement that chondroplasty was the primary surgical objective — not incidental to another procedure. That documentation prevents the most common denial: payers and auditors flagging 29877 as a bundled service when the operative note lacks compartment specificity or reads like cleanup during a more complex case.

See how Mira captures CPT 29877 documentation