M85.321 Osteitis condensans, right upper arm

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

• M85.31 Osteitis condensans, shoulder
• M85.311 Osteitis condensans, right shoulder
• M85.312 Osteitis condensans, left shoulder
• M85.319 Osteitis condensans, unspecified shoulder
• M85.32 Osteitis condensans, upper arm
• M85.321 Osteitis condensans, right upper arm (this code)
• M85.322 Osteitis condensans, left upper arm
• M85.329 Osteitis condensans, unspecified upper arm
• M85.33 Osteitis condensans, forearm
• M85.331 Osteitis condensans, right forearm
• M85.332 Osteitis condensans, left forearm