Surgical arthroscopy of the temporomandibular joint (TMJ), including any diagnostic component performed during the same session.
Verified May 8, 2026 · 5 sources ↓
- Medicare
- $541.76
- Total RVUs
- 16.22
- Global, days
- 90
- Region
- Other
Documentation requirements
What must appear in the operative or office note to support the claim.
Source · Editorial brief grounded in 5 cited references ↓
- Operative note documenting the arthroscopic approach, portal placement, and all surgical maneuvers performed (e.g., lysis of adhesions, disc repositioning, lavage, synovectomy)
- Diagnosis of specific TMJ disorder (e.g., internal derangement, disc displacement, synovitis) supported by imaging — MRI or CT preferred by most payers
- Documented conservative treatment failure prior to surgery, including duration and modalities tried (splint therapy, physical therapy, NSAIDs)
- Anesthesia type used — general anesthesia is standard; note should confirm it was administered
- Laterality documented explicitly — right, left, or bilateral TMJ — to support modifier selection
- Pre- and postoperative functional assessment of jaw opening, pain level, and occlusal status to support medical necessity
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 5 cited references ↓
CPT 29804 covers surgical arthroscopy of the temporomandibular joint — the joint connecting the jaw to the skull. The procedure is performed through a small incision near the ear, through which an arthroscope is inserted to visualize the joint and carry out surgical intervention. Operative work may include removal of inflamed or fibrotic tissue, disc repositioning, lysis of adhesions, lavage, or smoothing of irregular joint surfaces. Because surgical arthroscopy always includes the diagnostic component, 29804 supersedes 29800 when surgical work is performed — you cannot bill both on the same date.
The code carries a 90-day global period under CMS. That window covers the day-before preoperative visit, the procedure itself, and all routine postoperative care through day 90. Any unrelated procedure billed during the global period requires modifier 79. An unplanned return to the OR for a related complication requires modifier 78. Staged or planned subsequent procedures require modifier 58.
This code is predominantly billed by oral and maxillofacial surgeons. Payer coverage varies significantly — some commercial plans categorize TMJ procedures under dental exclusions, and medical necessity documentation is the single most important factor in getting the claim paid. Always include the operative report and, for commercial payers, a clinical cover letter establishing medical necessity tied to a diagnosis-coded TMJ disorder.
RVU & reimbursement
Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.
Source · CMS Physician Fee Schedule, RVU26A · January 2026
| Work RVU | 8.65 |
| Practice expense RVU | 6.43 |
| Malpractice RVU | 1.14 |
| Total RVU | 16.22 |
| Medicare national rate | $541.76 |
| 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 | $541.76 |
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 29804 get rejected.
Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓
- Claim routed under dental benefit exclusion by commercial payers — requires separate medical necessity argument and often peer-to-peer appeal
- Missing documentation of conservative treatment failure before surgical intervention
- Billing 29800 (diagnostic) and 29804 (surgical) on the same date — surgical arthroscopy includes the diagnostic component and 29800 is bundled
- Insufficient specificity in operative note — notes that describe 'standard TMJ arthroscopy' without detailing surgical findings and maneuvers are audit targets
- Incorrect global period management — billing routine post-op visits without modifier 24 during the 90-day global window
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 5 cited references ↓
01Can I bill 29800 and 29804 together on the same date?
02What modifiers apply if the TMJ arthroscopy is performed bilaterally?
03How do I handle a subsequent unrelated jaw or facial procedure during the 90-day global period?
04Why do commercial payers deny 29804 under dental exclusions?
05What is the difference between 29804 and arthrocentesis codes like 20605 or 20606 for TMJ?
06Is a pre-authorization typically required for 29804?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CMS Physician Fee Schedule 2026
- 02aaoms.orghttps://aaoms.org/publications/coding-and-billing-papers/coding-for-temporomandibular-surgery/
- 03aapc.comhttps://www.aapc.com/codes/cpt-codes/29804
- 04payerprice.comhttps://payerprice.com/rates/29804-CPT-fee-schedule
- 05mdclarity.comhttps://www.mdclarity.com/cpt-code/29804
Mira AI Scribe
Mira's AI scribe captures portal placement site, a named description of each surgical maneuver performed (lysis of adhesions, disc repositioning, lavage volume, tissue removal), laterality, anesthesia type, and intraoperative findings with joint appearance. This prevents the most common audit flag for 29804 — operative notes that document an approach but fail to substantiate surgical necessity or describe what was actually done inside the joint.
See how Mira captures CPT 29804 documentation