M33.9 — Dermatopolymyositis, unspecified
M33.9 is a non-billable header ICD-10-CM code for dermatopolymyositis, unspecified. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with M33.9
These codes carry an Excludes1 note pointing at M33.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M33.9 alone.
- G72Other and unspecified myopathies
Risk adjustment
M33.9 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 history
M33.9 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead M33.9
5 child codes. Green means billable.
- M33.90Dermatopolymyositis, unspecified, organ involvement unspecified
- M33.91Dermatopolymyositis, unspecified with respiratory involvement
- M33.92Dermatopolymyositis, unspecified with myopathy
- M33.93Dermatopolymyositis, unspecified without myopathy
- M33.99Dermatopolymyositis, unspecified with other organ involvement
Related codes at this level
Codes that share M33. If M33.9 is not quite right, the correct code is usually one of these.
Questions about M33.9
- Is M33.9 a billable ICD-10-CM code?
- No. M33.9 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does M33.9 sit in the tabular list?
- Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Systemic connective tissue disorders (M30-M36).