M33.1
Other dermatomyositis
M33.1 is a non-billable ICD-10-CM code header for other dermatomyositis. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M33.10 Other dermatomyositis, organ involvement unspecified; M33.11 Other dermatomyositis with respiratory involvement; M33.12 Other dermatomyositis with myopathy; M33.13 Other dermatomyositis without myopathy and 1 more. Its coding notes include 1 Excludes1 entry and 10 Excludes2 entries.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (1 note)
- autoimmune disease, single organ or single cell-type -code to relevant condition category
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Includes
Further defines or gives examples of the content of the category.
Also from chapter/block level (4 notes)
- autoimmune disease NOS
- collagen (vascular) disease NOS
- systemic autoimmune disease
- systemic collagen (vascular) disease
Inclusion terms
Conditions classified to this code.
- Adult dermatomyositis
Notes
Also from chapter/block level (1 note)
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition