ICD-10-CM diagnosis code
M33.99 Dermatopolymyositis, unspecified with other organ involvement
- Billable
- Yes, a complete code (FY2026)
- Category
- M33 Dermatopolymyositis
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Other codes in M33
19 complete codes in this category.
- M33.12Other dermatomyositis with myopathy
- M33.13Other dermatomyositis without myopathy
- M33.19Other dermatomyositis with other organ involvement
- M33.20Polymyositis, organ involvement unspecified
- M33.21Polymyositis with respiratory involvement
- M33.22Polymyositis with myopathy
- M33.29Polymyositis with other organ involvement
- 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
Documentation tips
- Make sure the note supports every element of the title, “Dermatopolymyositis, unspecified with other organ involvement”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to M33.
The international WHO ICD-10 also has M33, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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