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ICD-10-CM 2027 diagnosis code

Z28.83Immunization not carried out due to unavailability of vaccine

✓ Billable / specificPOA exemptNot a principal dx

Z28.83 is a valid, billable ICD-10-CM code for immunization not carried out due to unavailability of vaccine. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Immunization not crd out due to unavailability of vaccine

Code last changed in FY2019 (effective October 1, 2018). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z28.83

Z28.83 is the ICD-10-CM diagnosis code for immunization not carried out due to unavailability of vaccine. It belongs to category Z28 (immunization not carried out and underimmunization status), block Z20-Z29 (persons with potential health hazards related to communicable diseases) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z28.8 (immunization not carried out for other reason), Z28.83 is specifically for immunization not carried out due to unavailability of vaccine. Related codes cover due to patient having had the disease (Z28.81), because of caregiver refusal (Z28.82) and for other reason (Z28.89).

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 795 (Normal Newborn, relative weight 0.2022) and DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and 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.

It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2019, effective October 1, 2018.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Delay in delivery of vaccine
  • Lack of availability of vaccine
  • Manufacturer delay of vaccine

Notes that apply from higher levels

Instructions written at a parent level also apply to Z28.83.

› From Z28 Immunization not carried out and underimmunization status
Includes
  • vaccination not carried out
Code also
  • , if applicable, encounter for immunization safety counseling (Z71.85)

Broader instructions also apply from Chapter 21: Factors influencing health status and contact with health services.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to Z28.83.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2019 (effective 10/1/2018): Added
  • No changes since FY2019.

Common questions about Z28.83

Is Z28.83 billable?

Yes. Z28.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Z28.83 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 Z28.83 a CC or MCC?

No. Z28.83 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Z28.83 group to?

Z28.83 is used in the MS-DRG v44.0 logic for MS-DRG 795 (Normal Newborn) and MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.