ICD-10-CM Alphabetic Index · FY 2027 7 Entries

Polymyositis in the ICD-10-CM Index ICD-10-CM

The main term Polymyositis (acute) (chronic) (hemorrhagic) carries 7 index entries pointing to 4 ICD-10-CM codes. The default entry is M33.20, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.

✓ Built from the official CMS FY 2027 index fileEffective Oct 1, 2026 – Sep 30, 2027

Index Entries

Codes Referenced

M33.20

Default Code

Letter

7 of 7 shown

ICD-10-CM

Index Entries Under Polymyositis 7 entries · 4 codes

Polymyositis (acute) (chronic) (hemorrhagic) M33.20

with

myopathy M33.22

respiratory involvement M33.21

skin involvement see Dermatopolymyositis

specified organ involvement NEC M33.29

ossificans (generalisata) (progressiva) see Myositis, ossificans, progressiva

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Related Index Terms

Dermatopolymyositis Myositis All index terms starting with P Index to Diseases and Injuries ICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, FY 2027 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2026 through September 30, 2027.