Injection · Other

21116

Injection procedure into the temporomandibular joint (TMJ) performed specifically to facilitate arthrographic imaging of the joint space.

Verified May 8, 2026 · 5 sources ↓

Medicare
$222.45
Total RVUs
6.66
Global, days
0
Region
Other
Drawn from MdclarityAaomsPayerpriceEmednyCMS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

  • Specify which joint was injected — right, left, or bilateral — to support laterality modifier selection
  • Document the clinical indication (e.g., suspected internal disc derangement, failed conservative TMJ treatment) with a supporting ICD-10 diagnosis
  • Injection technique note: approach, needle placement, contrast agent used, and volume injected
  • Arthrographic imaging findings or, if billing modifier 26, a separate interpretation and report signed by the interpreting physician
  • Pre-procedure assessment confirming the patient's identity, site, and consent per facility or payer requirements

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 26 Professional component 50 Bilateral procedure 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 21116 covers the injection of contrast material into the temporomandibular joint to enable arthrographic x-ray imaging. The procedure is used diagnostically to evaluate internal derangement, disc displacement, or other structural pathology of the TMJ when other imaging is inconclusive. It is classified under Introduction Procedures on the Head within the musculoskeletal surgery section.

The global period is 000, meaning no pre- or post-operative visits are included in the surgical package. Each encounter stands alone for billing purposes. The procedure is performed most commonly in an office or ASC setting. Laterality modifiers (LT/RT) are required when a single joint is injected; modifier 50 applies when both joints are injected in the same session.

Because 21116 is a combined injection-and-imaging service, the operative or procedure note must document both the injection technique and the imaging findings. Splitting the technical and professional components with modifier 26 is appropriate when the radiologist reads the images separately from the injecting provider.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU0.79
Practice expense RVU5.75
Malpractice RVU0.12
Total RVU6.66
Medicare national rate$222.45
Global period0 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

SettingMedicare rate (national)
Office (PFS non-facility)
Procedure performed in physician's office
$222.45

Common denial reasons

The recurring reasons claims for CPT 21116 get rejected.

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

  • Missing or mismatched laterality — billing without LT/RT when payer requires it, or billing 50 without proper bilateral documentation
  • Diagnosis code does not support medical necessity for arthrographic injection (e.g., using a nonspecific pain code when payer requires a structural TMJ diagnosis)
  • Separate billing of imaging guidance when it is considered bundled into 21116 by the payer — confirm NCCI edits before adding a fluoroscopy code
  • Modifier 26 or TC applied incorrectly when the same provider performed and interpreted the imaging at a global facility

Frequently asked questions

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

01Is fluoroscopic guidance separately billable with 21116?
Check NCCI edits before adding a fluoroscopy code. Many payers consider imaging guidance integral to the arthrography procedure and will bundle it. Confirm the edit pair and modifier status for your specific payer before appending a separate guidance code.
02When should I use modifier 50 versus LT/RT for TMJ arthrography?
Use LT or RT when only one joint is injected. Use modifier 50 when both TMJs are injected in the same session. Medicare and most payers require you to bill a single line with modifier 50 — not two separate lines — for bilateral procedures. Reimbursement typically does not exceed 150% of the single-side allowable.
03What ICD-10 codes are commonly paired with 21116?
Internal derangement of the TMJ (M26.60–M26.69) is the most common supporting diagnosis. Disc displacement codes within that range (M26.601–M26.619) align most directly with the arthrographic indication. Confirm your payer's covered diagnosis list, as some require a more specific code.
04Can modifier 26 be used with 21116?
Yes — when the injecting provider and the interpreting radiologist are billing separately, the radiologist bills 21116-26 for the professional interpretation. The facility or injecting provider's group bills the technical component. Applying 26 incorrectly when one provider does both services at a global facility is a common audit flag.
05What is the global period for 21116, and does it affect same-day billing?
The global period is 000 — no pre- or post-operative package applies. Each date of service is independent. There is no global window to worry about for subsequent encounters, but you still need to evaluate NCCI bundling if other procedures are billed on the same day.
06Is 21116 an orthopedic code or an oral and maxillofacial surgery code?
21116 sits in the CPT musculoskeletal surgery section and is used by oral and maxillofacial surgeons, radiologists, and occasionally other specialists who perform TMJ arthrography. AAOMS coding guidance specifically references this code for TMJ arthrographic injection procedures.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

  1. 01
    mdclarity.com
    https://www.mdclarity.com/cpt-code/21116
  2. 02
    aaoms.org
    https://aaoms.org/publications/coding-and-billing-papers/coding-for-temporomandibular-surgery/
  3. 03
    payerprice.com
    https://payerprice.com/rates/21116-CPT-fee-schedule
  4. 04
    emedny.org
    https://www.emedny.org/providermanuals/physician/pdfs/physician%20procedure%20codes%20sect5.pdf
  5. 05CMS Physician Fee Schedule 2026

Mira AI Scribe

Mira's AI scribe captures the injection site (right TMJ, left TMJ, or bilateral), contrast agent and volume, needle approach, and the arthrographic imaging findings from dictation — all in the procedure note. That prevents the two most common denials for 21116: missing laterality documentation and a bare procedure note that lacks imaging interpretation, which auditors flag as incomplete for a combined injection-arthrography service.

See how Mira captures CPT 21116 documentation

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