2026 ICD-10-CM Diagnosis Code M33Dermatopolymyositis

ICD-10-CM Codes›M00–M99›M30-M36›M33

ICD-10-CM M33
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M33 is a non-billable ICD-10-CM category code for dermatopolymyositis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M33.00, M33.01, M33.02, and M33.03.

Code Identity

ICD-10-CM Code
M33
Billable Status
No — Non-Billable Category
Code Describes
Dermatopolymyositis
Chapter
M30-M36
Systemic connective tissue disorders

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM30-M36Systemic connective tissue disorders
CategoryM33Dermatopolymyositis
This CodeM33Dermatopolymyositis

Specific Coding for DermatopolymyositisOverview

Non-specific codes like M33 require more characters. Use one of these billable codes instead:

  • M33.0 for Juvenile dermatomyositis

  • Use M33.00 for Juvenile dermatomyositis, organ involvement unspecified

  • Use M33.01 for Juvenile dermatomyositis with respiratory involvement

  • Use M33.02 for Juvenile dermatomyositis with myopathy

  • Use M33.03 for Juvenile dermatomyositis without myopathy

  • Use M33.09 for Juvenile dermatomyositis with other organ involvement

  • M33.1 for Other dermatomyositis

  • Use M33.10 for Other dermatomyositis, organ involvement unspecified

  • Use M33.11 for Other dermatomyositis with respiratory involvement

  • Use M33.12 for Other dermatomyositis with myopathy

  • Use M33.13 for Other dermatomyositis without myopathy

  • Use M33.19 for Other dermatomyositis with other organ involvement

  • M33.2 for Polymyositis

  • Use M33.20 for Polymyositis, organ involvement unspecified

  • Use M33.21 for Polymyositis with respiratory involvement

  • Use M33.22 for Polymyositis with myopathy

  • Use M33.29 for Polymyositis with other organ involvement

  • M33.9 for Dermatopolymyositis, unspecified

  • Use M33.90 for Dermatopolymyositis, unspecified, organ involvement unspecified

  • Use M33.91 for Dermatopolymyositis, unspecified with respiratory involvement

  • Use M33.92 for Dermatopolymyositis, unspecified with myopathy

  • Use M33.93 for Dermatopolymyositis, unspecified without myopathy

  • Use M33.99 for Dermatopolymyositis, unspecified with other organ involvement

Patient EducationClinical

Myositis

Myositis means inflammation of the muscles that you use to move your body. An injury, infection, or autoimmune disease can cause it. Two specific kinds are polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of your body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M33Overview

Is M33 (Dermatopolymyositis) a billable code?

No. This is a category header that groups the codes for dermatopolymyositis, and headers cannot be submitted on claims. Claims for dermatopolymyositis need a more specific code from this category, such as M33.00, M33.01, and M33.02.