Summary & Overview
CPT 21490: Open Reduction of Dislocated Temporomandibular Joint
CPT code 21490 represents an open surgical reduction of a dislocated temporomandibular joint (TMJ), performed when the jaw is locked in an open, painful position and closed or manual reduction is not feasible. This procedural code is important nationwide because it covers definitive operative management for acute or recurrent TMJ dislocations that cause functional impairment and severe pain. Insurers and clinicians use the code for surgical claims, prior authorization discussions, and quality tracking for oral and maxillofacial services.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical description of the procedure, the typical settings where the service is delivered, and the common billing modifiers associated with surgical procedures for TMJ. The publication provides benchmarks for payer coverage and utilization where available, highlights relevant coding considerations, and summarizes the clinical context that typically justifies use of this code. Data not available in the input is clearly noted where applicable. This national overview is intended to inform coding staff, surgical providers, and revenue cycle teams about the procedural scope and administrative considerations tied to CPT code 21490.
Billing Code Overview
CPT code 21490 describes a surgical procedure to treat dislocation of the temporomandibular joint (TMJ) in which the jaw is locked open and painful. The provider gains access to the TMJ through an incision and manually repositions the joint back into its proper anatomic location.
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Service type: Surgical reduction of TMJ dislocation (open approach)
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Typical site of service: Hospital operating room or ambulatory surgical center where invasive facial or oral-maxillofacial procedures are performed.
Clinical & Coding Specifications
Clinical Context
A 34-year-old male presents to the emergency department with an acute locked-open jaw after attempting to yawn broadly; he reports severe preauricular pain, inability to close the mouth, drooling, and impaired oral intake. On exam the mandibular condyle is palpable anterior to the articular eminence and the patient has limited mandibular range of motion. After failed closed reduction attempts under local sedation in the ED, the oral and maxillofacial surgery team is consulted. The patient is taken to the operating room for open reduction of a temporomandibular joint dislocation (CPT 21490). The surgeon makes a preauricular incision, exposes the joint, releases constraining soft tissue, and manipulates the condyle posteriorly into the glenoid fossa under general anesthesia. Hemostasis is obtained, and incision closure is performed. Postoperative workflow includes recovery from anesthesia, pain control, short-term immobilization instructions (eg, soft diet, limited mouth opening), and follow-up within 7–14 days to assess joint stability and wound healing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typically required (extensive dissection, unexpected intraoperative findings). |