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Z79.899 ICD-10-CM Code: Other long term (current) drug therapy

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term · 2 Excludes2 · 2 code-also instructions

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43, Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Z79.899 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on Z79.899 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • long term (current) drug use for prophylactic purposes

Source: inherited from Z79

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from Z79

Code Also

Additional codes that may be required to fully describe the encounter.

  • any therapeutic drug level monitoring (Z51.81) inherited from Z79
  • any follow-up examination (Z08-Z09) inherited from Z77-Z99

Coder workflow for Z79.899

MedCoder structured workflow — derived from this code’s own official record

Before you code Z79.899

  1. “Other” (NEC) means the condition is specified in the record but no dedicated code captures it. Confirm the documented form is not one a sibling code names before settling on Z79.899; if the record states no specifics at all, the unspecified sibling applies instead. “Other” codes are for documented conditions the classification gives no specific code; “unspecified” codes are for records lacking the detail (Guidelines I.A.9.a, I.A.9.b).

    ReviewZ79.890, Z79.891

    See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

  2. Confirm the reason for the encounter this Z code records: the circumstance it records. Check whether the code may be reported as first-listed or principal — some Z codes are limited to one position — and do not report a history or status code for a condition documented as current. Z code categories and their reporting positions (Guidelines I.C.21.c, I.C.21.c.15).

    Guide: Z codes as principal or first-listed diagnosis →

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The reason for the encounter
Whether the code records the encounter’s purpose, a status, or a history — and whether it may be first-listed (Guidelines I.C.21.c).
Any detail beyond this code’s title
What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

  • Excludes2 — not part of Z79.899(2 notes)

    Coding workflow: The conditions named in this note are not included in Z79.899. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareO99.32

    See the official tabular notes · Guidelines I.A.12.b

  • Code Also — related condition(2 notes)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    ReviewZ51.81

    See the official tabular notes · Guidelines I.A.17

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Code Overview

Other long term (current) drug therapy is a billable ICD-10-CM diagnosis code (Z79.899).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Official Coding Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Official source data — quoted verbatim from the CMS/NCHS Official Guidelines

Verbatim excerpts from the ICD-10-CM Official Guidelines for Coding and Reporting (CMS/NCHS) that govern this code.

Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99), U07.1, U09.9 a. Human Immunodeficiency Virus (HIV) Infections 1) Code only confirmed cases

Code Z79.899, Other long term (current) drug therapy, may be assigned as an additional code to identify the long-term (current) use of antiretroviral medications.

Chapter 4: Endocrine, Nutritional, and Metabolic Diseases (E00 -E89)

3) Diabetes mellitus and the use of insulin, oral hypoglycemics, and injectable non-insulin drugs If the documentation in a medical record does not indicate the type of diabetes but does indicate that the patient uses insulin, code E11-, Type 2 diabetes mellitus, should be assigned. Additional code(s) should be assigned from category Z79 to identify the long-term (current) use of insulin, oral hypoglycemic drugs, or injectable non-insulin antidiabetic, as follows: If the patient is treated with both oral hypoglycemic drugs and insulin, both code Z79.4, Long term (current) use of insulin, and code Z79.84, Long term (current) use of oral hypoglycemic drugs, should be assigned. If the patient is treated with both insulin and an injectable non-insulin antidiabetic drug, assign codes Z79.4, Long term (current) use of insulin, and Z79.85, Long-term (current) use of injectable non-insulin antidiabetic drugs. If the patient is treated with both oral hypoglycemic drugs and an injectable non-insulin antidiabetic drug, assign codes Z79.84, Long term (current) use of oral hypoglycemic drugs, and Z79.85, Long-term (current) use of injectable non-insulin antidiabetic drugs. Code Z79.4 should not be assigned if insulin is given temporarily to bring a type 2 patient’s blood sugar under control during an encounter.

Chapter 4: Endocrine, Nutritional, and Metabolic Diseases (E00 -E89)

(a) Secondary diabetes mellitus and the use of insulin, oral hypoglycemic drugs, or injectable non-insulin drugs For patients with secondary diabetes mellitus who routinely use insulin, oral hypoglycemic drugs, or injectable non-insulin drugs, additional code(s) from category Z79 should be assigned to identify the long-term (current) use of insulin, oral hypoglycemic drugs, or non-injectable non-insulin drugs as follows: If the patient is treated with both oral hypoglycemic drugs and insulin, both code Z79.4, Long term (current) use of insulin, and code Z79.84, Long term (current) use of oral hypoglycemic drugs, should be assigned. If the patient is treated with both insulin and an injectable non- insulin antidiabetic drug, assign codes Z79.4, Long- term (current) use of insulin, and Z79.85, Long-term (current) use of injectable non-insulin antidiabetic drugs. If the patient is treated with both oral hypoglycemic drugs and an injectable non-insulin antidiabetic drug, assign codes Z79.84, Long-term (current) use of oral hypoglycemic drugs, and Z79.85, Long-term (current) use of injectable non-insulin antidiabetic drugs. Code Z79.4 should not be assigned if insulin is given temporarily to bring a secondary diabetic patient’s blood sugar under control during an encounter.

Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

Z74.01 Bed confinement status Z76.82 Awaiting organ transplant status Z78 Other specified health status Code Z78.1, Physical restraint status, may be used when it is documented by the provider that a patient has been put in restraints during the current encounter. Please note that this code should not be reported when it is documented by the provider that a patient is temporarily restrained during a procedure. Z79 Long- term (current) drug therapy Codes from this category indicate a patient’s continuous use of a prescribed drug (including such things as aspirin therapy) for the long-term treatment of a condition or for prophylactic use. It is not for use for patients who have addictions to drugs. This subcategory is not for use of medications for detoxification or maintenance programs to prevent withdrawal symptoms (e.g., methadone maintenance for opiate dependence). Assign the appropriate code for the drug use, abuse, or dependence instead.

Chapter 21: Factors influencing health status and contact with health services (Z00-Z99)

Assign a code from Z79 if the patient is receiving a medication for an extended period as a prophylactic measure (such as for the prevention of deep vein thrombosis) or as treatment of a chronic condition (such as arthritis) or a disease requiring a lengthy course of treatment (such as cancer). Do not assign a code from category Z79 for medication being administered for a brief period of time to

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Z79.899 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes2 note: Z92.2 — Personal history of drug therapy (via Z79.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Use Additional Code instruction: D84.821 — Immunodeficiency due to drugs.

These codes instruct coders to additionally report this code when it applies.

Referenced by 1 Code Also instruction: Z51.81 — Encounter for therapeutic drug level monitoring (via Z79.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 2 MS-DRGs: DRG 949 (MDC 23), DRG 950 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):FAC025 — Other specified status (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified status).

Z79.69 — Long term (current) use of other immunomodulators and immunosuppressants, Z79.810 — Long term (current) use of selective estrogen receptor modulators (SERMs), Z79.811 — Long term (current) use of aromatase inhibitors, Z79.818 — Long term (current) use of other agents affecting estrogen receptors and estrogen levels, Z79.82 — Long term (current) use of aspirin, Z79.83 — Long term (current) use of bisphosphonates, Z79.84 — Long term (current) use of oral hypoglycemic drugs, Z79.85 — Long-term (current) use of injectable non-insulin antidiabetic drugs, Z79.890 — Hormone replacement therapy, Z79.891 — Long term (current) use of opiate analgesic, Z88.0 — Allergy status to penicillin, Z88.1 — Allergy status to other antibiotic agents, Z88.2 — Allergy status to sulfonamides, Z88.3 — Allergy status to other anti-infective agents, Z88.4 — Allergy status to anesthetic agent, Z88.5 — Allergy status to narcotic agent, Z88.6 — Allergy status to analgesic agent, Z88.7 — Allergy status to serum and vaccine, Z88.8 — Allergy status to other drugs, medicaments and biological substances, Z88.9 — Allergy status to unspecified drugs, medicaments and biological substances, +232 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Prophylactic”, “Therapy”; these codes share that main term but sit in a different category of the Tabular List.

F11.20 — Opioid dependence, uncomplicated (drug, long-term, methadone, maintenance therapy), Z23 — Encounter for immunization (vaccination), Z40.00 — Encounter for prophylactic removal of unspecified organ (organ removal), Z40.01 — Encounter for prophylactic removal of breast (organ removal, breast), Z40.02 — Encounter for prophylactic removal of ovary(s) (organ removal, ovary), Z40.03 — Encounter for prophylactic removal of fallopian tube(s) (organ removal, fallopian tube), Z40.09 — Encounter for prophylactic removal of other organ (organ removal, specified site NEC), Z40.89 — Encounter for other prophylactic surgery (surgery, specified NEC), Z40.9 — Encounter for prophylactic surgery, unspecified (surgery)

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

HbA1c Test (Glycated Hemoglobin), Blood Glucose Test, Fecal Occult Blood Test (FOBT), Gamma-glutamyl Transferase (GGT) Test, Lipid Panel, Prostate-Specific Antigen (PSA), Thyroid Stimulating Hormone (TSH)

Contextual Map

Every relationship of Z79.899 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Z79.899 with these 3 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Use Additional Code instructions

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services[MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 1,235 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

  • Long-term (current) (prophylactic) drug therapy (use of), drug, specified NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Prophylactic, medication[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Therapy, drug, long-term (current) (prophylactic), drug, specified NEC[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Real-World Coding Questions

Questions working coders have asked about this code, answered from official sources and reviewed by an editor.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2026), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Z79.899 — Other long term (current) drug therapy." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/z79.899-other-long-term-current-drug-therapy

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Other long term (current) drug therapy

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z79.899 in its code family, with their registry titles.

View all codes in the Z79 family