Is M81 a billable ICD-10-CM code?

No. M81 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M81 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 M81?

M81 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

M81

M81 — Osteoporosis without current pathological fracture

Non-billable headerICD-10-CM

M81 is a non-billable header ICD-10-CM code for osteoporosis without current pathological fracture. 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.

osteoporosis with current pathological fracture (M80.-)
Sudeck's atrophy (M89.0)

Use additional code

Add a secondary code to capture the detail described below.

code to identify:
major osseous defect, if applicable (M89.7-)
personal history of (healed) osteoporosis fracture, if applicable (Z87.310)

Other codes that can never be billed with M81

These codes carry an Excludes1 note pointing at M81. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M81 alone.

R29.890Loss of height
K91.2Postsurgical malabsorption, not elsewhere classified

Risk adjustment

M81 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 M81

3 child codes. Green means billable.

Questions about M81

Is M81 a billable ICD-10-CM code?: No. M81 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M81 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 M81?: M81 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.