M85.831 Other specified disorders of bone density and structure, right forearm

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)

Applies from M85.8 Other specified disorders of bone density and structure

Applicable to

• Hyperostosis of bones, except skull
• Osteosclerosis, acquired

Excludes1 (never code together)

• diffuse idiopathic skeletal hyperostosis [DISH] (M48.1)
• osteosclerosis congenita (Q77.4)
• osteosclerosis fragilitas (generalista) (Q78.2)
• osteosclerosis myelofibrosis (D75.81)

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.90 Disorder of bone and cartilage, unspecified (approximate)
• 733.99 Other disorders of bone and cartilage (approximate)

Nearby codes

• M85.82 Other specified disorders of bone density and structure, upper arm
• M85.821 Other specified disorders of bone density and structure, right upper arm
• M85.822 Other specified disorders of bone density and structure, left upper arm
• M85.829 Other specified disorders of bone density and structure, unspecified upper arm
• M85.83 Other specified disorders of bone density and structure, forearm
• M85.831 Other specified disorders of bone density and structure, right forearm (this code)
• M85.832 Other specified disorders of bone density and structure, left forearm
• M85.839 Other specified disorders of bone density and structure, unspecified forearm
• M85.84 Other specified disorders of bone density and structure, hand
• M85.841 Other specified disorders of bone density and structure, right hand
• M85.842 Other specified disorders of bone density and structure, left hand