2026 ICD-10-CM Diagnosis Code Y66Nonadministration of surgical and medical care
Y66 is a billable ICD-10-CM diagnosis code for nonadministration of surgical and medical care. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under External cause codes: complications of medical and surgical care, initial encounter.
Code Identity
Code Classification
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Premature cessation of surgical and medical care
Type 1 Excludes
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
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 the full article at MedlinePlus
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Convert Y66 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Y66Overview
Is Y66 (Nonadministration of surgical and medical care) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report nonadministration of surgical and medical care on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of Y66?
Under the General Equivalence Mappings, nonadministration of surgical and medical care converts to ICD-9-CM E876.8 (medical misadventure NEC). The mapping is approximate, so confirm the match fits the documentation.
