ICD-10 code for sixth disease

The ICD-10-CM code for sixth disease is B08.20 (Exanthema subitum [sixth disease], unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B08.20.

Within B08.2, choose B08.20 (unspecified) only when documentation doesn't support a more specific option: due to human herpesvirus 6 (B08.21) and due to human herpesvirus 7 (B08.22).

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 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 865 (Viral Illness with MCC, relative weight 1.3485) and DRG 866 (Viral Illness without MCC, relative weight 0.8692), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and 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.