Summary & Overview
CPT 21240: Temporomandibular Joint Arthroplasty with Autograft
CPT code 21240 represents temporomandibular joint (TMJ) arthroplasty performed with autogenous graft material to repair, reposition, or replace TMJ structures. This surgical procedure addresses functional impairment of the jaw and is relevant to craniofacial, oral and maxillofacial, and otolaryngologic surgical practices. Nationally, TMJ arthroplasty is a specialized procedure with implications for surgical capacity, payer coverage policies, and episode-of-care management.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and sites of service, common billing considerations, and where to look for payer-specific coverage rules. The publication summarizes typical utilization settings (inpatient and ambulatory surgical centers), highlights the procedural focus on autograft use, and identifies operational issues that affect coding and claims processing.
This summary equips clinicians, billing professionals, and policy analysts with the essentials: what CPT code 21240 denotes, why it matters across payers, and the types of benchmarks and policy details to review when managing TMJ arthroplasty cases.
Billing Code Overview
CPT code 21240 describes an arthroplasty of the temporomandibular joint (TMJ) using autogenous graft material obtained from the patient. The procedure involves surgical reconstruction or replacement of components of the TMJ (the hinge connecting the lower jaw to the temporal bone) to restore or improve jaw function.
Service Type: Surgical — TMJ arthroplasty with autograft
Typical Site of Service: Inpatient or outpatient operating room / surgical center, depending on clinical complexity and patient needs.
Clinical & Coding Specifications
Clinical Context
A 48-year-old patient presents with chronic, progressive unilateral temporomandibular joint (TMJ) pain, limited mouth opening, and crepitus despite exhaustive conservative care including occlusal splint therapy, physical therapy, anti-inflammatory medication, and intra-articular steroid injections. Imaging (CT and MRI) demonstrates advanced degenerative changes of the mandibular condyle with joint space collapse and ankylosis of the TMJ. The oral and maxillofacial surgeon recommends TMJ arthroplasty with autogenous grafting to reconstruct the joint surfaces and restore hinge function. The clinical workflow includes preoperative evaluation (medical clearance, dental occlusion assessment, imaging review), informed consent, intraoperative harvest of autogenous graft material (for example, costochondral graft), reconstruction of the TMJ via arthroplasty/condylar reconstruction, intraoperative and postoperative analgesia and antibiotics, immediate postoperative inpatient or ambulatory recovery depending on medical complexity, and scheduled outpatient follow-up for jaw function rehabilitation and occlusal adjustments. Typical site of service is an operating room in a hospital or ambulatory surgical center. The service type is major reconstructive surgery of the temporomandibular joint performed by an oral and maxillofacial surgeon or head and neck surgeon using the patient’s own tissue for grafting to repair, reposition, or replace TMJ components to improve mandibular function.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services |