Nonadministration of surgical and medical care
In Misadventures to patients during surgical and medical care (Y62-Y69), chapter 20: External Causes of Morbidity
- Y66 is billable and valid on claims for FY 2027. If the record has more detail, check the other codes under Y62-Y69 below.
- As a secondary diagnosis it is not a CC or MCC, so it doesn't raise the MS-DRG payment.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
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Instructional notes
Also applies, from Misadventures to patients during surgical and medical care (Y62-Y69)
These notes sit on Y62-Y69 and apply to every code under it, including Y66.
Excludes1: not coded here, use a different code
- surgical and medical procedures as the cause of abnormal reaction of the patient, without mention of misadventure at the time of the procedure (Y83-Y84)
Excludes2: not included here, code separately if applicable
- breakdown or malfunctioning of medical device (during procedure) (after implantation) (ongoing use) (Y70-Y82)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers how to report external cause codes (V00-Y99) describing cause, intent, place, activity, and status. They are never principal or first-listed, and reporting is voluntary unless required.
- General External Cause Coding Guidelines (page 88)
- Place of Occurrence Guideline (page 89)
- Activity Code (page 89)
- Place of Occurrence, Activity, and Status Codes Used with other External Cause Code (page 89)
- If the Reporting Format Limits the Number of External Cause Codes (page 90)
- Multiple External Cause Coding Guidelines (page 90)
- Child and Adult Abuse Guideline (page 90)
- Unknown or Undetermined Intent Guideline (page 91)
Other codes under Y62-Y69
Misadventures to patients during surgical and medical care (Y62-Y69)
- Y62Failure of sterile precautions during surgical and medical care
- Y63Failure in dosage during surgical and medical care
- Y64Contaminated medical or biological substances
- Y65Other misadventures during surgical and medical care
- Y66Nonadministration of surgical and medical care(this code)
- Y69Unspecified misadventure during surgical and medical care
Y66 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
Y66 is in External cause codes: complications of medical and surgical care, initial encounter (EXT025), with 116 codes. Others in it:
- Y62.0 Failure of sterile precautions during surgical operation
- Y62.1 Failure of sterile precautions during infusion or transfusion
- Y62.2 Failure of sterile precautions during kidney dialysis and other perfusion
- Y62.3 Failure of sterile precautions during injection or immunization
- Y62.4 Failure of sterile precautions during endoscopic examination
- Y62.5 Failure of sterile precautions during heart catheterization
- Y62.6 Failure of sterile precautions during aspiration, puncture and other catheterization
- Y62.8 Failure of sterile precautions during other surgical and medical care
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Patient Safety
You can help prevent medical errors by being an active member of your health care team. Research shows that patients who are more involved with their care tend to get better results. To reduce the risk of medical errors, you can:
Read more about patient safety on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- E876.8 Other specified misadventures during medical care (approximate)