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ICD-10-CM 2027 diagnosis code

Y66Nonadministration of surgical and medical care

✓ Billable / specific

Y66 is a valid, billable ICD-10-CM code for nonadministration of surgical and medical care. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Y66

Y66 is the ICD-10-CM diagnosis code for nonadministration of surgical and medical care. It belongs to block Y62-Y69 (misadventures to patients during surgical and medical care) and chapter 20 (external causes of morbidity). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report Y66 together with the conditions in its Excludes1 note: DNR status (Z66) and palliative care (Z51.5).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as E876.8 (other specified misadventures during medical care).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Premature cessation of surgical and medical care
Excludes1Not coded here — never report together with this code

Notes that apply from higher levels

Instructions written at a parent level also apply to Y66.

Broader instructions also apply from Y62-Y69 Misadventures to patients during surgical and medical care and Chapter 20: External causes of morbidity.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to Y66.

ICD-9-CM equivalent

Converter →
  • E876.8Other specified misadventures during medical careapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Y66

Is Y66 billable?

Yes. Y66 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Y66 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict Y66 as a principal diagnosis.

Is Y66 a CC or MCC?

No. Y66 is neither a CC nor an MCC under MS-DRG v44.0.

What is the ICD-9 code for Y66?

The CMS General Equivalence Mappings map Y66 to ICD-9-CM E876.8.