O99.824Streptococcus B carrier state complicating childbirth

O99.824 is the ICD-10-CM diagnosis code for streptococcus B carrier state complicating childbirth. It belongs to category O99 (other maternal diseases classifiable elsewhere but complicating pregnancy, childbirth and the puerperium), block O94-O9A (other obstetric conditions, not elsewhere classified) and chapter 15 (pregnancy, childbirth and the puerperium). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within O99.82 (streptococcus B carrier state complicating pregnancy, childbirth and the puerperium), O99.824 is specifically for streptococcus B carrier state complicating childbirth. Related codes cover pregnancy (O99.820) and the puerperium (O99.825).

Use an additional code to identify specific condition.

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 998 (Principal Diagnosis Invalid as Discharge Diagnosis), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 648.91 (other current conditions classifiable elsewhere of mother, delivered, with or without mention of antepartum condition) and V02.51 (carrier or suspected carrier of group B streptococcus).