Summary & Overview

CPT 29907: Arthroscopic Subtalar Joint Fusion

CPT code 29907 identifies an arthroscopic subtalar joint fusion, a minimally invasive foot and ankle surgical procedure used to treat subtalar joint pathology by fusing the joint with grafts or implants. Nationally, this code matters because it captures a specialized orthopedic intervention that can affect surgical volume, device use, and post-operative care patterns across payers. It is relevant to policymakers, hospital planners, and payers managing benefit design and utilization for foot and ankle surgery.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for the procedure, typical sites of service, and the kinds of benchmarks and policy issues commonly reported for codes of this type: utilization and setting trends, device and implant considerations, prior authorization and coverage drivers, and implications for ambulatory surgical center versus hospital outpatient department care. The publication also summarizes expected content areas such as coding specificity, common modifiers in practice, and how this code interacts with related surgical services.

Where specific data elements were not provided in the input, the text notes that those details are unavailable. The article is written for a national audience and focuses on the clinical and billing meaning of CPT code 29907 and its relevance to payers and health systems.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 29907arthroscopic subtalar fusionfoot and ankle surgeryorthopedic surgeryambulatory surgerysurgical codingarthroscopyjoint fusion

Billing Code Overview

CPT code 29907 describes an arthroscopic subtalar joint fusion procedure. The provider performs an arthroscopic examination of the subtalar joint near the heel and fuses the joint using a graft or implants. Arthroscopy involves use of an arthroscope, a small camera, to visualize the joint and guide treatment.

Service type: Surgical — Orthopedic, Arthroscopic Joint Fusion

Typical site of service: Hospital outpatient operating room or ambulatory surgery center (foot/ankle surgical suite)

Data not available in the input.

Clinical & Coding Specifications

Clinical Context

A 52-year-old patient presents with chronic lateral hindfoot pain, instability, and progressive subtalar arthritis refractory to conservative care (physical therapy, orthotics, and steroid injections). Imaging (weightbearing radiographs and CT) demonstrates joint space narrowing, osteophyte formation, and malalignment of the subtalar joint. The orthopedic foot and ankle surgeon schedules an arthroscopic subtalar arthrodesis with bone grafting and fixation. The procedure is performed in an ambulatory surgery center under general or regional anesthesia. The surgical team establishes standard arthroscopic portals, uses an arthroscope to debride cartilage and prepare subchondral bone, introduces graft material or structural implant, and achieves fixation (screws or implants) to obtain fusion. Typical perioperative workflow includes preoperative antibiotic prophylaxis, intraoperative fluoroscopy for fixation confirmation, postoperative immobilization in a splint or cast, and follow-up radiographs to document progressive fusion. Billing is reported using 29907 for the arthroscopic subtalar arthrodesis including graft or implant placement.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	When reporting only the surgeon’s professional interpretation or technical supervision separate from facility technical component (rare for this OR procedure).
`50`	Bilateral procedure	When both left and right subtalar joints are fused during the same operative session.
`51`	Multiple procedures	When `29907` is reported with other distinct procedures during the same operative session.
`52`	Reduced services	When the procedure is started but significantly reduced or not completed as planned.
`53`	Discontinued procedure	When the procedure is terminated due to an extenuating circumstance prior to completion.
`62`	Two surgeons	When two surgeons work together as primary surgeons performing distinct portions of `29907`.
`63`	Procedure performed on infants and toddlers	When patient age qualifies and payer requires this modifier for age-related reporting.
`78`	Return to OR for related procedure during global period	When a related unplanned return to the operating room for a complication occurs during the global period.
`79`	Unrelated procedure or service during global period	When an unrelated procedure is performed during the global period (not listed in the provided modifier list but commonly relevant); if not allowed, use `79` only when appropriate per payer.
`LT`	Left side	When the left subtalar joint is operated on.
`RT`	Right side	When the right subtalar joint is operated on.
`54`	Surgical care only	When the billing provider is only furnishing the surgical component and another entity bills pre/postoperative care.
`55`	Postoperative management only	When the billing provider is only furnishing postoperative care for the surgical episode.
`22`	Increased procedural services	When work required is substantially greater than typically required for `29907` and documentation supports unusual service intensity.

Taxonomy Code	Specialty	Notes
207K00000X	Orthopaedic Surgery	Foot and ankle fellowship-trained orthopedic surgeons commonly perform `29907`.
207K00000X	Podiatry (Surgical)	Podiatric surgeons with subspecialty training perform arthroscopic subtalar fusion in approved settings.
2080P0006X	Physical Medicine & Rehabilitation	PM&R physicians manage pre- and postoperative nonoperative care and rehabilitation planning.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M19.071`	Primary osteoarthritis, right ankle and foot	Subtalar joint osteoarthritis is a common indication for subtalar arthrodesis when conservative care fails.
`M19.072`	Primary osteoarthritis, left ankle and foot	Same clinical relevance for left-sided disease.
`M19.079`	Primary osteoarthritis, unspecified ankle and foot	Used when laterality is not specified at the time of coding.
`M21.6X1`	Acquired deformity of feet, right foot	Hindfoot malalignment contributing to subtalar joint degeneration and need for fusion.
`M21.6X2`	Acquired deformity of feet, left foot	As above for left foot.
`S92.331A`	Displaced fracture of calcaneus, right foot, initial encounter for closed fracture	Post-traumatic subtalar arthritis following calcaneal fracture leading to arthrodesis.
`S92.332A`	Displaced fracture of calcaneus, left foot, initial encounter for closed fracture	As above for left side.
`M76.872`	Tibiofibular tendinopathy, left lower leg	Periarticular tendon pathology often present in complex hindfoot disease (used when clinically documented).

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20680`	Removal of implant; deep (e.g., buried wire, pin, screw, metal, or other fixation device)	May be performed later if hardware from subtalar fusion requires removal for pain or complication.
`28899`	Unlisted procedure, foot or toes	Used when a specific adjunct or novel surgical technique related to the foot is performed that is not described by existing codes.
`28830`	Arthrodesis, subtalar, with or without excision of calcaneal spur; open (includes internal fixation when performed)	Open subtalar arthrodesis when an open approach is used instead of arthroscopic technique; sometimes performed if arthroscopy is not feasible.
`76000`	Fluoroscopic guidance; radiologic supervision and interpretation	Intraoperative fluoroscopy is commonly used to confirm joint alignment and hardware placement during `29907`.
`20930`	Allograft, spine or other; structural, for spine or other use	Billed when structural bone allograft is used to aid fusion during subtalar arthrodesis (select payers require specific graft codes).