ICD-10-CM 2027
ICD-10 code for measles
From the official ICD-10-CM alphabetic index entry “Measles (black) (hemorrhagic) (suppressed)”. Page updated September 29, 2026.
About coding measles
The ICD-10-CM code for measles is B05.9 (Measles without complication). The official index lists 7 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B05.9.
Within B05, choose B05.9 (without complication) only when documentation doesn't support a more specific option: complicated by encephalitis (B05.0), complicated by meningitis (B05.1), complicated by pneumonia (B05.2), complicated by otitis media (B05.3), with intestinal complications (B05.4) and with other complications (B05.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites), 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 measles codes (official index)
- with
- complications NEC B05.89 — Other measles complications
- encephalitis B05.0 — Measles complicated by encephalitis
- intestinal complications B05.4 — Measles with intestinal complications
- keratitis (keratoconjunctivitis) B05.81 — Measles keratitis and keratoconjunctivitis
- meningitis B05.1 — Measles complicated by meningitis
- otitis media B05.3 — Measles complicated by otitis media
- pneumonia B05.2 — Measles complicated by pneumonia
- French
- German
- Liberty
Common questions about measles ICD-10 codes
What is the ICD-10 code for measles?
- B05.9 — Measles without complication. More specific codes apply when the documentation supports them: B05.89, B05.0, B05.4, B05.81 and others below.
Is B05.9 billable?
- Yes. B05.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B05.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B05.9 as a principal diagnosis.
Is B05.9 a CC or MCC?
- No. B05.9 is neither a CC nor an MCC under MS-DRG v44.0.