ICD-10-CM 2027
ICD-10 code for Koplik's spots
From the official ICD-10-CM alphabetic index entry “Koplik's spots”. Page updated September 29, 2026.
About coding Koplik's spots
The ICD-10-CM code for Koplik's spots is B05.9 (Measles without complication).
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.
Common questions about Koplik's spots ICD-10 codes
What is the ICD-10 code for Koplik's spots?
- B05.9 — Measles without complication.
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.