Diagnostic arthroscopy of the temporomandibular joint (TMJ), with or without synovial biopsy, performed as a separate procedure.

Verified May 8, 2026 · 5 sources ↓

Medicare: $508.70
Total RVUs: 15.23
Global, days: 90
Region: Other

Drawn from CMSNIHMdclarity

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Diagnosis documented with specificity — disc displacement with or without reduction, synovitis, osteoarthritis, or internal derangement of the TMJ
Conservative treatment failure documented: duration, modalities tried (occlusal splint, PT, NSAIDs), and clinical response
Operative note specifying arthroscopic approach, joint compartment(s) entered, intra-articular findings, and whether synovial biopsy was obtained
If biopsy taken, pathology requisition and specimen documentation must be present and biopsy coded separately
Pre-authorization confirmation and medical necessity letter on file for payers requiring it
Imaging supporting diagnosis (MRI arthrogram or CBCT) referenced in the operative or pre-op 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 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 5 cited references ↓

CPT 29800 covers arthroscopic examination of the temporomandibular joint. The surgeon introduces an arthroscope into the TMJ to evaluate intra-articular pathology — disc displacement, synovitis, adhesions, or degenerative changes consistent with TMJ disorder. If clinically indicated, a synovial biopsy is taken during the same operative session. The code is designated a separate procedure, meaning it is bundled when a more definitive surgical arthroscopy of the same joint is performed at the same encounter.

The 90-day global period means all routine post-operative management through day 90 is included in the payment. Any unrelated E/M or procedure billed within that window requires modifier 24 or 79, respectively. If the arthroscopic approach is abandoned and converted to an open TMJ procedure, report only the open code — 29800 cannot be stacked with the open procedure code per NCCI policy.

Site of service matters here. The HOPD and ASC facility payments differ substantially; the professional fee is the same regardless of setting, but where you schedule the case affects total episode cost and patient liability. Most payers require documented failure of conservative management (splint therapy, physical therapy, pharmacologic treatment) before authorizing TMJ arthroscopy.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	6.67
Practice expense RVU	7.14
Malpractice RVU	1.42
Total RVU	15.23
Medicare national rate	$508.70
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	$508.70
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 29800 get rejected.

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

Lack of documented conservative treatment failure prior to surgical authorization
Billed as a separate procedure when a surgical TMJ arthroscopy was performed at the same encounter — bundling edit applies
Missing or vague operative note that does not specify joint compartment entered or arthroscopic findings
ICD-10 diagnosis code too nonspecific (e.g., M26.60) without clinical detail to support medical necessity
Procedure performed by a provider outside the payer's covered specialty list for TMJ arthroscopy (some payers restrict to oral/maxillofacial surgery or specified ENT subspecialties)

Frequently asked questions

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

01Can 29800 be billed on the same day as a surgical TMJ arthroscopy?

No. 29800 is designated a separate procedure and bundles into any surgical arthroscopy of the same TMJ joint performed at the same encounter. Report only the surgical arthroscopy code.

02If the arthroscopy is converted to an open TMJ procedure, do you report both codes?

No. NCCI policy is explicit: when an arthroscopic procedure is converted to open, report only the open procedure code. Neither a diagnostic nor surgical arthroscopy code is added.

03Is modifier 50 appropriate for bilateral TMJ arthroscopy?

Yes, if both TMJs are scoped during the same operative session, modifier 50 applies. Document each joint separately in the operative note, including findings and any biopsy obtained on each side.

04What ICD-10 codes are typically linked to 29800?

Common mappings include M26.601–M26.609 (TMJ disorder, unspecified/right/left), M26.611–M26.619 (adhesions/ankylosis), and M26.69 (other specified TMJ disorders). Use the most specific laterality code available.

05Which specialties typically bill 29800, and does payer credentialing matter?

Oral and maxillofacial surgeons perform the majority of TMJ arthroscopies. Some payers restrict coverage to specific specialties or require that the performing provider hold relevant TMJ surgical credentials — verify credentialing before scheduling.

06Does the 90-day global period apply even for a diagnostic arthroscopy?

Yes. 29800 carries a 90-day global period. Routine follow-up visits related to the procedure within 90 days are included. Bill unrelated services with modifier 24 (E/M) or modifier 79 (unrelated procedure).

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 joint compartment(s) entered, arthroscopic findings (disc position, synovial appearance, adhesions), and whether a synovial biopsy was obtained and sent to pathology. It also pulls the documented history of conservative treatment failure into the operative note summary. That prevents the two most common denials: a vague operative note flagged in audit and a prior-authorization mismatch where the record doesn't reflect the medical necessity criteria the payer approved.

See how Mira captures CPT 29800 documentation