ICD-10-CM 2027
ICD-10 code for fifth disease
From the official ICD-10-CM alphabetic index entry “Disease, diseased › fifth”. Page updated September 29, 2026.
About coding fifth disease
The ICD-10-CM code for fifth disease is B08.3 (Erythema infectiosum [fifth disease]).
Within B08 (other viral infections characterized by skin and mucous membrane lesions, not elsewhere classified), B08.3 is specifically for erythema infectiosum [fifth disease]. Related codes cover other orthopoxvirus infections (B08.0), Molluscum contagiosum (B08.1), exanthema subitum [sixth disease] (B08.2), enteroviral vesicular stomatitis with exanthem (B08.4), enteroviral vesicular pharyngitis (B08.5), parapoxvirus infections (B08.6), yatapoxvirus infections (B08.7) and other specified viral infections characterized by skin and mucous membrane lesions (B08.8).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
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 fifth disease ICD-10 codes
What is the ICD-10 code for fifth disease?
- B08.3 — Erythema infectiosum [fifth disease].
Is B08.3 billable?
- Yes. B08.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B08.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B08.3 as a principal diagnosis.
Is B08.3 a CC or MCC?
- B08.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.