M85.57 Aneurysmal bone cyst, ankle and foot

Non-billable header with 3 child codes.

Applies from M85 Other disorders of bone density and structure

Excludes1 (never code together)

• osteogenesis imperfecta (Q78.0)
• osteopetrosis (Q78.2)
• osteopoikilosis (Q78.8)
• polyostotic fibrous dysplasia (Q78.1)

Applies from M85.5 Aneurysmal bone cyst

Excludes2 (not included here)

• aneurysmal cyst of jaw (M27.4)

Codes under M85.57

• M85.571 Aneurysmal bone cyst, right ankle and foot
• M85.572 Aneurysmal bone cyst, left ankle and foot
• M85.579 Aneurysmal bone cyst, unspecified ankle and foot

Diagnosis Index entries for M85.57

• Cyst (colloid) (mucous) (simple) (retention) › bone (local) NEC › aneurysmal › ankle
• Cyst (colloid) (mucous) (simple) (retention) › bone (local) NEC › aneurysmal › foot
• Cyst (colloid) (mucous) (simple) (retention) › bone (local) NEC › aneurysmal › toe

Nearby codes

• M85.559 Aneurysmal bone cyst, unspecified thigh
• M85.56 Aneurysmal bone cyst, lower leg
• M85.561 Aneurysmal bone cyst, right lower leg
• M85.562 Aneurysmal bone cyst, left lower leg
• M85.569 Aneurysmal bone cyst, unspecified lower leg
• M85.57 Aneurysmal bone cyst, ankle and foot (this code)
• M85.571 Aneurysmal bone cyst, right ankle and foot
• M85.572 Aneurysmal bone cyst, left ankle and foot
• M85.579 Aneurysmal bone cyst, unspecified ankle and foot
• M85.58 Aneurysmal bone cyst, other site
• M85.59 Aneurysmal bone cyst, multiple sites