ICD-10-CM 2027
ICD-10 code for Lapsed immunization schedule status
From the official ICD-10-CM alphabetic index entry “Lapsed immunization schedule status”. Page updated September 29, 2026.
About coding Lapsed immunization schedule status
The ICD-10-CM code for Lapsed immunization schedule status is Z28.39 (Other underimmunization status).
Within Z28.3, choose Z28.39 (Other underimmunization status) only when documentation doesn't support a more specific option: underimmunization for COVID-19 status (Z28.31).
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 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), 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 Lapsed immunization schedule status ICD-10 codes
What is the ICD-10 code for Lapsed immunization schedule status?
- Z28.39 — Other underimmunization status.
Is Z28.39 billable?
- Yes. Z28.39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z28.39 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z28.39 a CC or MCC?
- No. Z28.39 is neither a CC nor an MCC under MS-DRG v44.0.