Summary & Overview
CPT 29905: Arthroscopic Subtalar Joint Synovectomy
CPT code 29905 represents arthroscopic examination of the subtalar joint with synovectomy — a minimally invasive procedure used to diagnose and treat inflammation and pathology within the subtalar joint near the heel. This code is relevant nationally because subtalar arthroscopy is a specialized foot-and-ankle service with implications for surgical practice patterns, site-of-service decisions, and payer coverage policies.
Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for when CPT code 29905 is used, typical settings where the procedure is performed, and what stakeholders commonly evaluate when reviewing claims for subtalar arthroscopy. The publication outlines expected benchmarks and utilization considerations, highlights common documentation elements that support medical necessity for arthroscopic synovectomy of the subtalar joint, and summarizes relevant policy themes affecting authorization and reimbursement. Data not available in the input are noted where applicable.
Billing Code Overview
CPT code 29905 describes an arthroscopic subtalar joint procedure with synovectomy, a minimally invasive (keyhole) surgery in which the provider uses an arthroscope to examine the subtalar joint near the heel and remove inflamed synovial tissue. The procedure combines diagnostic arthroscopy with therapeutic debridement of synovium.
-
Service type: Arthroscopic joint procedure with synovectomy
-
Typical site of service: Outpatient ambulatory surgery center or hospital operating room focused on foot and ankle procedures
Clinical & Coding Specifications
Clinical Context
A 42-year-old recreational runner presents with persistent lateral hindfoot pain, swelling, and mechanical catching after an inversion ankle injury several months prior. Imaging (MRI and weight-bearing radiographs) shows synovial hypertrophy and inflammatory change localized to the subtalar joint. Nonoperative measures including activity modification, bracing, NSAIDs, and a corticosteroid injection provided incomplete relief. The orthopedic foot and ankle surgeon schedules an operative arthroscopy of the subtalar joint to evaluate intra-articular pathology and perform synovectomy.
The clinical workflow includes preoperative evaluation and optimization, informed consent discussing risks and benefits of arthroscopy and possible conversion to open procedure, preoperative antibiotic and DVT prophylaxis per facility protocol, intraoperative arthroscopic examination of the subtalar joint with synovial biopsy and synovectomy using small portals and specialized instruments, hemostasis and closure, postoperative recovery in PACU, and short-term follow-up for wound check and rehabilitation focusing on controlled weight-bearing and range-of-motion exercises.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier required / undefined | Rarely used; default when no modifier applies |