M85.171 Skeletal fluorosis, right 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) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.99 Other disorders of bone and cartilage (approximate)

Nearby codes

• M85.16 Skeletal fluorosis, lower leg
• M85.161 Skeletal fluorosis, right lower leg
• M85.162 Skeletal fluorosis, left lower leg
• M85.169 Skeletal fluorosis, unspecified lower leg
• M85.17 Skeletal fluorosis, ankle and foot
• M85.171 Skeletal fluorosis, right ankle and foot (this code)
• M85.172 Skeletal fluorosis, left ankle and foot
• M85.179 Skeletal fluorosis, unspecified ankle and foot
• M85.18 Skeletal fluorosis, other site
• M85.19 Skeletal fluorosis, multiple sites
• M85.2 Hyperostosis of skull