M85.379 Osteitis condensans, unspecified ankle and foot

Billable ICD-10-CM code, FY2026.

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)

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.5 Osteitis condensans (approximate)

Nearby codes

• M85.362 Osteitis condensans, left lower leg
• M85.369 Osteitis condensans, unspecified lower leg
• M85.37 Osteitis condensans, ankle and foot
• M85.371 Osteitis condensans, right ankle and foot
• M85.372 Osteitis condensans, left ankle and foot
• M85.379 Osteitis condensans, unspecified ankle and foot (this code)
• M85.38 Osteitis condensans, other site
• M85.39 Osteitis condensans, multiple sites
• M85.4 Solitary bone cyst
• M85.40 Solitary bone cyst, unspecified site
• M85.41 Solitary bone cyst, shoulder