Is M85 a billable ICD-10-CM code?

No. M85 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M85 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of bone density and structure (M80-M85).

What cannot be coded together with M85?

M85 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

M85

M85 — Other disorders of bone density and structure

Non-billable headerICD-10-CM

M85 is a non-billable header ICD-10-CM code for other disorders of bone density and structure. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

osteogenesis imperfecta (Q78.0)
osteopetrosis (Q78.2)
osteopoikilosis (Q78.8)
polyostotic fibrous dysplasia (Q78.1)

Risk adjustment

M85 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead M85

9 child codes. Green means billable.

Questions about M85

Is M85 a billable ICD-10-CM code?: No. M85 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M85 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Disorders of bone density and structure (M80-M85).
What cannot be coded together with M85?: M85 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.