Convert ICD-10 J42 to ICD-9

ICD-10 code J42, Unspecified chronic bronchitis, crosswalked to ICD-9 with the official CMS General Equivalence Mappings. Convert another code below.

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Official CMS General Equivalence Mappings Final GEMs release (FY 2018) Maps in both directions

1 ICD-9 mapping for ICD-10 J42

From the official CMS General Equivalence Mappings. Review each mapping's flags before selecting the final code. Convert another code

ICD-10 code J42, "Unspecified chronic bronchitis", maps to ICD-9 code 491.9, "Chronic bronchitis NOS". This mapping carries no qualifying flags, so it is considered an exact equivalent. The crosswalk comes from the official CMS General Equivalence Mappings.

ICD‑10 Code

J42

Unspecified chronic bronchitis

ICD‑9 Code

491.9

Chronic bronchitis NOS

– This is a direct match with no additional mapping qualifiers.

See everything about the source code, including its category, synonyms, and history: open the J42 code page → Or run the reverse crosswalk: convert 491.9 back to ICD-10 →