M85.121 Skeletal fluorosis, 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) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.99 Other disorders of bone and cartilage (approximate)

Nearby codes

• M85.11 Skeletal fluorosis, shoulder
• M85.111 Skeletal fluorosis, right shoulder
• M85.112 Skeletal fluorosis, left shoulder
• M85.119 Skeletal fluorosis, unspecified shoulder
• M85.12 Skeletal fluorosis, upper arm
• M85.121 Skeletal fluorosis, right upper arm (this code)
• M85.122 Skeletal fluorosis, left upper arm
• M85.129 Skeletal fluorosis, unspecified upper arm
• M85.13 Skeletal fluorosis, forearm
• M85.131 Skeletal fluorosis, right forearm
• M85.132 Skeletal fluorosis, left forearm