ICD-10-CM 2027 diagnosis code
Z79.891Long term (current) use of opiate analgesic
Z79.891 is a valid, billable ICD-10-CM code for long term (current) use of opiate analgesic. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 Z79.891
Z79.891 is the ICD-10-CM diagnosis code for long term (current) use of opiate analgesic. It belongs to category Z79 (long term (current) drug therapy), block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) 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 Z79.89 (other long term (current) drug therapy), Z79.891 is specifically for long term (current) use of opiate analgesic. Related codes cover hormone replacement therapy (Z79.890) and other long term (current) drug therapy (Z79.899).
The conditions in its Excludes2 note aren't part of Z79.891, but may be coded alongside it if the patient has both: methadone use NOS (F11.9-) and use of methadone for treatment of heroin addiction (F11.2-).
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 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 V58.69 (Long-term (current) use of other medications).
Coding notes
Notes that apply from higher levels
Instructions written at a parent level also apply to Z79.891.
Alphabetic index entries
4 entriesTerms in the official ICD-10-CM index that lead to Z79.891.
- Long-term (current) (prophylactic) drug therapy (use of) › methadone for pain management
- Long-term (current) (prophylactic) drug therapy (use of) › opiate analgesic
- Therapy › drug, long-term (current) (prophylactic) › methadone › for pain management
- Therapy › drug, long-term (current) (prophylactic) › opiate analgesic
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 →- V58.69Long-term (current) use of other medicationsapproximate
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 Z79.891
Is Z79.891 billable?
- Yes. Z79.891 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z79.891 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Z79.891 as a principal diagnosis.
Is Z79.891 a CC or MCC?
- No. Z79.891 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does Z79.891 group to?
- Z79.891 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.