Z66 — Do not resuscitate
Is Z66 billable?
Yes — Z66 is billable for FY2027. Z66 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Z66 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Z66 at a glance
| Code | Z66 |
|---|---|
| Description | Do not resuscitate |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
What Medicare edits apply to Z66?
The Medicare Code Editor screens inpatient claims before they are grouped. These edits name Z66 directly.
CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.
Which MS-DRGs does Z66 group to?
Z66 sits in MDC 23 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 951Other Factors Influencing Health Statusmedical
How is Z66 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Z66. They show the wording a clinician may have documented, which often differs from the Tabular description.
- DNR (do not resuscitate)
- Status › do not resuscitate (post)
Inclusion terms
Alternative wording in documentation that is classified to Z66.
- DNR status
How long has Z66 existed?
Z66 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with Z66?
ICD-10-CM declares these codes mutually exclusive with Z66 — exactly one of each pair can be correct for a given encounter.