Summary & Overview
CPT 29904: Subtalar Arthroscopy with Removal of Loose Body
CPT code 29904 describes arthroscopic examination of the subtalar joint with removal of a loose body or foreign body. As a focused foot and ankle arthroscopy, it combines diagnostic visualization with a therapeutic intervention, often used to address mechanical symptoms, pain, or obstruction within the subtalar joint. Nationally, this code represents a specialized ambulatory surgical service performed by orthopedic foot and ankle surgeons or sports medicine specialists.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for when CPT code 29904 is used, expected sites of service, and typical service components. The report highlights payer coverage considerations and comparative benchmarks for utilization and reimbursement patterns where available. It also summarizes relevant coding relationships and billing considerations commonly encountered with subtalar arthroscopy.
This summary is intended for clinical coders, revenue cycle professionals, and policy analysts seeking a clear national overview of CPT code 29904, its clinical purpose, and the payer landscape relevant to foot and ankle arthroscopic care.
Billing Code Overview
CPT code 29904 describes an arthroscopic procedure of the subtalar joint with removal of loose body or foreign body. The provider uses an arthroscope (a small camera) to visualize the subtalar joint near the heel and performs removal of any free fragments or foreign material encountered during the examination.
Service type: Arthroscopic surgical procedure, diagnostic and therapeutic
Typical site of service: Ambulatory surgery center or hospital outpatient department (foot/ankle surgical setting)
Clinical & Coding Specifications
Clinical Context
A 42-year-old recreational runner presents with persistent lateral hindfoot pain, intermittent locking, and mechanical catching of the subtalar joint after an inversion ankle injury six months prior. Conservative care including activity modification, NSAIDs, physical therapy, and a corticosteroid injection provided incomplete relief. Imaging (weight-bearing radiographs and MRI) demonstrates loose bodies within the posterior subtalar joint and synovitis. The orthopedic foot and ankle surgeon schedules an arthroscopic subtalar joint procedure to visualize the joint, remove loose/foreign bodies, perform synovial debridement, and address chondral flaps.
Preoperative workflow includes history and physical, informed consent documenting risks/benefits and the intent to perform arthroscopy with loose body removal, pre-op anesthesia evaluation, and billing preparations specifying CPT code 29904. Typical operative setting is an ambulatory surgical center or hospital outpatient operating room under general or regional anesthesia. Postoperative workflow includes recovery monitoring, wound care instructions, activity restrictions, and documented findings and specimens for pathology if sent.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the surgeon’s professional portion separate from technical facility services (rare for arthroscopy). |