2027 ICD-10-CM Diagnosis Code Z66Do not resuscitate

ICD-10-CM Codes›Z00–Z99›Z66›Z66

ICD-10-CM Z66
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z66 is a billable ICD-10-CM diagnosis code for do not resuscitate. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. 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
Short Description
Do not resuscitate
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z66: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • DNR status

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z66, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Z66: they are not reported together with it, unless the two conditions are unrelated.

  • Y66 Nonadministration of surgical and medical care
    DNR status (Z66)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

End of Life Issues

Planning for the end of life can be difficult. But by deciding what end-of-life care best suits your needs when you are healthy, you can help those close to you make the right choices when the time comes.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z66Overview

What is the ICD-10 code for do not resuscitate?

The ICD-10-CM code for do not resuscitate is Z66. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does Z66 group to?

On inpatient claims, do not resuscitate maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

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.