Z79.899 - Other long term (current) drug therapy

Version 2023
Replaced Code
ICD-10:Z79.899
Short Description:Other long term (current) drug therapy
Long Description:Other long term (current) drug therapy
Status: Valid for Submission
Version:ICD-10-CM 2023
Code Classification:
  • Factors influencing health status and contact with health services (Z00–Z99)
    • Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
      • Long term drug therapy (Z79) (current)

Z79.899 is a billable ICD-10 code used to specify a medical diagnosis of other long term (current) drug therapy. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Replaced Code

This code was replaced in the 2023 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2022. This code was replaced for the FY 2023 (October 1, 2022 - September 30, 2023).


  • Z79.60 - Lng trm (crnt) use unsp immunomodulator & immunosuppressant
  • Z79.61 - Long term (current) use of immunomodulator
  • Z79.620 - Long term (current) use of immunosuppressive biologic
  • Z79.621 - Long term (current) use of calcineurin inhibitor
  • Z79.622 - Long term (current) use of Janus kinase inhibitor
  • Z79.623 - Long term (crnt) use of mammalian target rapamycin inhibitor
  • Z79.624 - Long term (current) use of inhibtr of nucleotide synthesis
  • Z79.630 - Long term (current) use of alkylating agent
  • Z79.631 - Long term (current) use of antimetabolite agent
  • Z79.632 - Long term (current) use of antitumor antibiotic
  • Z79.633 - Long term (current) use of mitotic inhibitor
  • Z79.634 - Long term (current) use of topoisomerase inhibitor
  • Z79.64 - Long term (current) use of myelosuppressive agent
  • Z79.69 - Lng trm (crnt) use of immunomodulator & immunosuppressant
  • Z79.85 - Lng trm (crnt) use injectable non-insulin antidiabetic drugs

Index to Diseases and Injuries References

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for this diagnosis code are found in the injuries and diseases index:

Present on Admission (POA)

Z79.899 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert to ICD-9 Code

The General Equivalency Mapping (GEM) crosswalk indicates an approximate mapping between the ICD-10 code Z79.899 its ICD-9 equivalent. The approximate mapping means there is not an exact match between the ICD-10 code and the ICD-9 code and the mapped code is not a precise representation of the original code.

Code History

  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)