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Z99.81 ICD-10-CM Code: Dependence on supplemental oxygen

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

Coding at a Glance

Tabular directives
1 inclusion term · 1 code-also instruction

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 v44, Appendix B.

  • MS-DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)

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 Z99.81 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on Z99.81 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Dependence on long-term oxygen

Code Also

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

  • any follow-up examination (Z08-Z09)

Source: inherited from Z77-Z99

Coder workflow for Z99.81

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

Before you code Z99.81

  1. Confirm the reason for the encounter this Z code records: a status — a condition, carrier state or sequela that may affect care, distinct from a current complication of it. 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.3, I.C.21.c.15).

    Guide: Status codes (Z codes) →

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).

Official instructions as workflow

  • Code Also — related condition(1 note)

    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.

    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

Dependence on supplemental oxygen is a billable ICD-10-CM diagnosis code (Z99.81).

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 (2)

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 20: External Causes of Morbidity (V00-Y99)

1) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.

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

Z99 Dependence on enabling machines and devices, not elsewhere classified Note: Categories Z89-Z90 and Z93-Z99 are for use only if there are no complications or malfunctions of the organ or tissue replaced, the amputation site or the equipment on which the patient is dependent.

Verify Before Coding

  • Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.

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 Z99.81 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 2 Excludes2 notes: Z74 — Problems related to care provider dependency (via Z99.-), Z78 — Other specified health status (via Z99.-).

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

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 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 1 MS-DRG: DRG 951 (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

Principal diagnosis restriction (Medicare Code Editor)

Not acceptable as a principal diagnosis on an inpatient claim.

Same clinical category (CCSR)

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

Z91.A91 — Caregiver's noncompliance with patient's other medical treatment and regimen due to financial hardship, Z91.A98 — Caregiver's noncompliance with patient's other medical treatment and regimen for other reason, Z91.B — Personal risk factor of exposure to diethylstilbestrol, Z93.0 — Tracheostomy status, Z93.1 — Gastrostomy status, Z93.2 — Ileostomy status, Z93.3 — Colostomy status, Z93.4 — Other artificial openings of gastrointestinal tract status, Z93.50 — Unspecified cystostomy status, Z93.51 — Cutaneous-vesicostomy status, Z93.52 — Appendico-vesicostomy status, Z93.59 — Other cystostomy status, Z93.6 — Other artificial openings of urinary tract status, Z93.8 — Other artificial opening status, Z93.9 — Artificial opening status, unspecified, Z99.0 — Dependence on aspirator, Z99.11 — Dependence on respirator [ventilator] status, Z99.2 — Dependence on renal dialysis, Z99.3 — Dependence on wheelchair, Z99.89 — Dependence on other enabling machines and devices, +232 more

Same Index main term, other category

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

F19.259 — Other psychoactive substance dependence with psychoactive substance-induced psychotic disorder, unspecified (drug NEC, psychoactive NEC, with, psychosis), F19.26 — Other psychoactive substance dependence with psychoactive substance-induced persisting amnestic disorder (drug NEC, psychoactive NEC, with, amnestic disorder), F19.27 — Other psychoactive substance dependence with psychoactive substance-induced persisting dementia (drug NEC, psychoactive NEC, with, dementia), F19.280 — Other psychoactive substance dependence with psychoactive substance-induced anxiety disorder (drug NEC, psychoactive NEC, with, anxiety disorder), F19.281 — Other psychoactive substance dependence with psychoactive substance-induced sexual dysfunction (drug NEC, psychoactive NEC, with, sexual dysfunction), F19.282 — Other psychoactive substance dependence with psychoactive substance-induced sleep disorder (drug NEC, with sleep disorder), F19.288 — Other psychoactive substance dependence with other psychoactive substance-induced disorder (drug NEC, psychoactive NEC, with, other specified disorder), F19.29 — Other psychoactive substance dependence with unspecified psychoactive substance-induced disorder (drug NEC, psychoactive NEC, with, unspecified disorder), F55.8 — Abuse of other non-psychoactive substances (analgesic NEC), P96.1 — Neonatal withdrawal symptoms from maternal use of drugs of addiction (drug NEC, cocaine, withdrawal symptoms in newborn), Z71.41 — Alcohol abuse counseling and surveillance of alcoholic (alcohol, counseling and surveillance), Z71.51 — Drug abuse counseling and surveillance of drug abuser (drug NEC, counseling and surveillance), Z71.6 — Tobacco abuse counseling (tobacco, counseling and surveillance), Z74.09 — Other reduced mobility (on, care provider, impaired mobility), Z74.1 — Need for assistance with personal care (on, care provider, need for, assistance with personal care), Z74.2 — Need for assistance at home and no other household member able to render care (on, care provider, no other household member able to render care), Z74.3 — Need for continuous supervision (on, care provider, need for, continuous supervision), Z74.8 — Other problems related to care provider dependency (on, care provider, specified reason NEC), Z74.9 — Problem related to care provider dependency, unspecified (on, care provider), Z95.812 — Presence of fully implantable artificial heart (on, artificial heart), +159 more

Contextual Map

Every relationship of Z99.81 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 Z99.81 with these 2 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

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. 1,258 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Dependence (on) (syndrome), oxygen (long-term) (supplemental)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Dependence (on) (syndrome), supplemental oxygen[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (9)

Change history

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

Relevant guides

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 FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Coding guidelines Official source data
ICD-10-CM Official Guidelines for Coding and Reporting (FY2027), quoted by section Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 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 — v44 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. "Z99.81 — Dependence on supplemental oxygen." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/z99.81-dependence-on-supplemental-oxygen

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Dependence on supplemental oxygen

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, 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 Z99.81 in its code family, with their registry titles.

View all codes in the Z99 family