CPT 21490Surgery

Optx tmprmand dislocation

CPT 21490 covers the open surgical treatment of a dislocated jaw joint (temporomandibular joint or TMJ) that won't stay in place on its own. This procedure involves manually repositioning the jaw and may include surgical techniques to prevent future dislocations.

Showing rates for

National Average

Base Medicare rate

$780.20

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

12.95

PE RVU (NF)

9.92

MP RVU

1.25

Total RVU

24.12

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Clearly document whether procedure is open versus closed reduction. CPT 21490 requires surgical incision and exposure; if performed without incision, code 21480 or 21485 may be more appropriate
Impact: Coding error between open and closed reduction can result in $400-500 payment difference and potential recoupment demands
Document time from dislocation to treatment and all closed reduction attempts. Payers often require documentation that closed methods were attempted or contraindicated before approving open procedure
Impact: Missing this documentation is the leading cause of denials, potentially losing the entire $780.20 reimbursement
For recurrent dislocation cases, document frequency and impact on function. Additional stabilization procedures may warrant modifier 22 for increased complexity
Impact: Proper use of modifier 22 with documentation can increase payment by $156-234 (20-30% increase)
Bill facility (hospital) versus non-facility based on actual place of service. Both rates are identical at $780.20 for this procedure, but correct POS code prevents claim edits
Impact: Incorrect place of service coding triggers automatic denials requiring resubmission and payment delays of 30-60 days
When performed bilaterally, append modifier 50 and verify payer-specific bilateral surgery rules. Some payers require two line items with RT/LT instead of single line with modifier 50
Impact: Proper bilateral coding captures additional $390.10 payment for second side; incorrect formatting may result in second side denial
Ensure anesthesia is billed separately as this is a surgical procedure typically requiring general anesthesia. Anesthesia code 00190 is appropriate for TMJ procedures

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 21490 in 2025?

The 2025 Medicare national average reimbursement for CPT 21490 is $780.20 for both facility and non-facility settings. This is based on 24.12 total RVUs (12.95 work RVUs, 9.92 practice expense RVUs, and 1.25 malpractice RVUs) multiplied by the 2025 conversion factor of 32.3465.

What is the difference between CPT 21490 and CPT 21480?

CPT 21490 is for open surgical treatment of TMJ dislocation requiring an incision and direct surgical exposure of the joint, while CPT 21480 is for closed treatment (manipulation without incision). The open procedure (21490) reimburses at $780.20 compared to significantly less for closed treatment, and requires documentation of surgical incision and direct visualization of the joint structures.

Do I need modifier 50 for bilateral TMJ dislocation reduction?

Yes, if both temporomandibular joints are dislocated and require open reduction during the same operative session, append modifier 50 to CPT 21490. This increases reimbursement to 150% of the base rate ($1,170.30 total). Alternatively, some payers require billing two separate lines with RT and LT modifiers; verify payer-specific bilateral surgery policies.

How many RVUs is CPT code 21490 worth?

CPT 21490 has 24.12 total RVUs in 2025, consisting of 12.95 work RVUs, 9.92 practice expense RVUs (same for both facility and non-facility), and 1.25 malpractice RVUs. This is a moderately high RVU value reflecting the complexity and surgical skill required for open TMJ reduction.

Can CPT 21490 be billed with an E/M code on the same day?

Yes, but only with modifier 25 appended to the E/M code if a significant, separately identifiable evaluation and management service was performed on the same day. The E/M must be beyond the normal pre-operative assessment for the procedure. This is most commonly applicable in emergency department settings where initial evaluation occurs before the decision for surgery, but documentation must clearly support the separate service.

What documentation is required to bill CPT 21490 instead of a closed reduction code?

Documentation must include a detailed operative report describing the surgical incision (location and technique), dissection through tissue layers, direct visualization of the TMJ capsule and joint structures, the reduction maneuver performed under direct vision, and any capsular or ligament repairs. Simply stating 'open reduction' is insufficient; the surgical approach and anatomical exposure must be clearly described.

Does CPT 21490 require prior authorization from insurance?

Most commercial insurance plans and Medicare Advantage plans require prior authorization for CPT 21490 as it is a surgical procedure. Emergency cases may be exempt, but notification is typically required within 24-48 hours. Traditional Medicare does not require prior authorization. Failure to obtain required authorization when not emergent is a common reason for denial and can result in total loss of the $780.20 payment.