ICD-10-CM 2027
ICD-10 code for Dermatopolymyositis
Dermatopolymyositis, unspecified, organ involvement unspecified
From the official ICD-10-CM alphabetic index entry “Dermatopolymyositis”. Page updated September 29, 2026.
About coding Dermatopolymyositis
The ICD-10-CM code for Dermatopolymyositis is M33.90 (Dermatopolymyositis, unspecified, organ involvement unspecified). The official index lists 18 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M33.90.
Within M33.9, choose M33.90 (organ involvement unspecified) only when documentation doesn't support a more specific option: with respiratory involvement (M33.91), with myopathy (M33.92), without myopathy (M33.93) and with other organ involvement (M33.99).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 545 (Connective Tissue Disorders with MCC, relative weight 2.3892), DRG 546 (Connective Tissue Disorders with CC, relative weight 1.1745) and DRG 547 (Connective Tissue Disorders without CC/MCC, relative weight 0.7526), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Dermatopolymyositis codes (official index)
- with
- myopathy M33.92 — Dermatopolymyositis, unspecified with myopathy
- respiratory involvement M33.91 — Dermatopolymyositis, unspecified with respiratory involvement
- specified organ involvement NEC M33.99 — Dermatopolymyositis, unspecified with other organ involvement
- amyopathic M33.93 — Dermatopolymyositis, unspecified without myopathy
- in neoplastic disease D49.9 — Neoplasm of unspecified behavior of unspecified site
- juvenile M33.00 — Juvenile dermatomyositis, organ involvement unspecified
- with
- myopathy M33.02 — Juvenile dermatomyositis with myopathy
- respiratory involvement M33.01 — Juvenile dermatomyositis with respiratory involvement
- specified organ involvement NEC M33.09 — Juvenile dermatomyositis with other organ involvement
- amyopathic M33.03 — Juvenile dermatomyositis without myopathy
- without myopathy M33.03 — Juvenile dermatomyositis without myopathy
- specified NEC M33.10 — Other dermatomyositis, organ involvement unspecified
- amyopathic M33.13 — Other dermatomyositis without myopathy
- myopathy M33.12 — Other dermatomyositis with myopathy
- respiratory involvement M33.11 — Other dermatomyositis with respiratory involvement
- specified organ involvement NEC M33.19 — Other dermatomyositis with other organ involvement
- without myopathy M33.13 — Other dermatomyositis without myopathy
- without myopathy M33.93 — Dermatopolymyositis, unspecified without myopathy
Common questions about Dermatopolymyositis ICD-10 codes
What is the ICD-10 code for Dermatopolymyositis?
- M33.90 — Dermatopolymyositis, unspecified, organ involvement unspecified. More specific codes apply when the documentation supports them: M33.92, M33.91, M33.99, M33.93 and others below.
What is the ICD-10 code for amyopathic dermatopolymyositis?
- M33.93 — Dermatopolymyositis, unspecified without myopathy.
What is the ICD-10 code for juvenile dermatopolymyositis?
- M33.00 — Juvenile dermatomyositis, organ involvement unspecified.
Is M33.90 billable?
- Yes. M33.90 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M33.90 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict M33.90 as a principal diagnosis.
Is M33.90 a CC or MCC?
- M33.90 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.