2026 ICD-10-CM Diagnosis Code Z66Do not resuscitate

ICD-10-CM Codes›Z00–Z99›Z66›Z66

ICD-10-CM Z66
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z66 is a billable ICD-10-CM diagnosis code for do not resuscitate. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor. Coders also document this condition as cardiopulmonary resuscitation discontinued due to do not resuscitate order. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.

Code Identity

ICD-10-CM Code
Z66
Billable Status
Yes — Valid for Submission
Code Describes
Do not resuscitate
Chapter
Z66
Do not resuscitate status

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ66Do not resuscitate status
CategoryZ66Do not resuscitate
This CodeZ66Do not resuscitate

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z66.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cardiopulmonary resuscitation discontinued due to do not resuscitate order
  • Do not resuscitate status with supporting documentation
  • Finding of resuscitation status
  • Not for cardiopulmonary resuscitation
  • Not for resuscitation

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • DNR status

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • DNR(do not resuscitate)
    • Status(post)
      • do not resuscitate (DNR)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC025
Other specified status
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

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Convert Z66 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V49.86 Do not resusctate status
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z66Overview

Is Z66 (Do not resuscitate) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report do not resuscitate on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z66 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because do not resuscitate describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

What is the ICD-9 equivalent of Z66?

Under the General Equivalence Mappings, do not resuscitate converts to ICD-9-CM V49.86 (do not resusctate status). The mapping is a direct match.