CMM-406: Arthroscopy Ankle

Ankle arthroscopy procedures (including arthroscopically aided repair CPT 29892, endoscopic plantar fasciotomy CPT 29893, and other arthroscopy codes 29891, 29894–29899) are medically necessary only when documented relevant subjective symptoms and objective exam findings exist, appropriate imaging (standing three‑view X‑rays and MRI/CT as specified) supports the diagnosis, and there is less than clinically meaningful improvement after ≥6 weeks of conservative care (with required bracing/walker‑boot durations for arthroscopy and prior steroid injection for plantar fasciitis unless contraindicated). Procedures are not covered when red‑flag conditions or contraindications are present (e.g., septic arthritis, acute fractures with loose/locking fragments, dislocation/locked joint, infection, peripheral vascular disease, inability to comply with weight‑bearing restrictions, poor soft tissues, or uncontrolled comorbidities), and complete imaging and documentation are required for approval.