Summary & Overview
CPT 29891: Ankle Arthroscopy with Cartilage Defect Excision and Microfracture
CPT code 29891 denotes arthroscopic treatment of osteochondral or chondral defects in the ankle joint, including excision of damaged cartilage and drilling or microfracture of underlying bone to stimulate repair. The procedure targets pain relief and improved joint function and is commonly performed in ambulatory surgical centers and hospital outpatient departments. Nationally, this code is relevant to orthopedic and sports medicine practices, surgical centers, and payers managing musculoskeletal surgery utilization and outcomes. Key payers discussed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will find a concise overview of the clinical context for 29891, how the service is categorized for billing, and the typical settings and clinical goals for the procedure. The publication summarizes benchmark usage patterns and payer coverage considerations, highlights coding and documentation elements that commonly affect claim adjudication, and outlines recent policy and coverage updates impacting authorization and payment processes. Clinical implications for patient selection and expected functional benefits are described to give payers and providers context for utilization and outcomes. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 29891 describes an arthroscopic procedure on the ankle joint in which the surgeon examines intra-articular tissue, identifies and removes a focal cartilage defect of the talus and/or tibia, and performs marrow stimulation by drilling or microfracture of the underlying subchondral bone to encourage growth of repair tissue. The service is a cartilage repair/debridement procedure using an arthroscope.
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Service type: Arthroscopic cartilage debridement and marrow stimulation (ankle)
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Typical site of service: Ambulatory surgical center or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A 28-year-old recreational soccer player presents with persistent medial ankle pain and mechanical symptoms six months after an inversion injury. MRI demonstrates a focal full-thickness osteochondral lesion of the talar dome with a loose cartilage fragment and subchondral bone edema. Conservative care including activity modification, immobilization, NSAIDs, and physical therapy has failed. The patient is scheduled for an arthroscopic ankle procedure under general or regional anesthesia where the surgeon will visualize the joint with an arthroscope, perform debridement and excision of unstable cartilage, and perform microfracture drilling of the exposed subchondral bone to stimulate fibrocartilaginous repair. Typical workflow: preoperative evaluation and anesthesia clearance; operating room arthroscopy of the ankle (sterile setup, portal placement, diagnostic survey); targeted chondroplasty and excision of unstable fragments; microfracture or drilling of the lesion; hemostasis, portal closure, sterile dressing and immobilization; postoperative instructions with protected weight-bearing and outpatient physical therapy. Typical site of service is an ambulatory surgical center or hospital outpatient department. The service type is an arthroscopic operative procedure of the ankle joint for cartilage repair and stimulation of marrow repair (microfracture).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work or complexity substantially exceeds typical for (documented justification). |