ICD-10-CM 2027 diagnosis code
Z51.89Encounter for other specified aftercare
Z51.89 is a valid, billable ICD-10-CM code for encounter for other specified aftercare. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Looking up by condition? See ICD-10 code for Aftercare, ICD-10 code for Aftercare admission.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About Z51.89
Z51.89 is the ICD-10-CM diagnosis code for encounter for other specified aftercare. It belongs to category Z51 (encounter for other aftercare and medical care), block Z40-Z53 (Encounters for other specific health care) 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 Z51.8, choose Z51.89 (other specified aftercare) only when documentation doesn't support a more specific option: therapeutic drug level monitoring (Z51.81).
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 949 (Aftercare with CC/MCC, relative weight 1.123) and DRG 950 (Aftercare without CC/MCC, relative weight 0.7664), 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.
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 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 V58.89 (other specified aftercare) and V58.9 (unspecified aftercare).
Notes that apply from higher levels
Instructions written at a parent level also apply to Z51.89.
› From Z51.8 Encounter for other specified aftercare
- holiday relief care (Z75.5)
Broader instructions also apply from Z40-Z53 Encounters for other specific health care and Chapter 21: Factors influencing health status and contact with health services.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to Z51.89.
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 23 · Factors Influencing Health Status and Other Contacts with Health Services
ICD-9-CM equivalent
Converter →From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about Z51.89
Is Z51.89 billable?
- Yes. Z51.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z51.89 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 Z51.89 a CC or MCC?
- No. Z51.89 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Z51.89 group to?
- Z51.89 is used in the MS-DRG v44.0 logic for MS-DRG 949 (Aftercare with CC/MCC) and MS-DRG 950 (Aftercare without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.