ICD-10 Y66
Billable / SpecificNonadministration of surgical and medical care
About ICD-10-CM Y66
ICD-10-CM code Y66 represents Nonadministration of surgical and medical care. This is a billable/specific code in the External Causes of Morbidity chapter (block Y66). The 2026 edition of ICD-10-CM Y66 became effective on October 1, 2025.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under Y66. Per CMS ICD-10-CM Tabular 2026.
- Premature cessation of surgical and medical care
Type 1 Excludes
Pure excludes, these codes can never be coded together with Y66. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- DNR status (Z66)
- palliative care (Z51.5)
Medicare LCD Coverage for Y66
Local Coverage Determinations (LCDs) from CMS MACs that list Y66 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Y66.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but Y66 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with Y66
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert Y66 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| Y66 | E8768 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To Y66
Other codes in section Y62-Y69 (Misadventures to patients during surgical and medical care).
ICD-10 Y66, Billing FAQ
Is ICD-10 code Y66 billable? +
Yes, Y66 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to Y66? +
ICD-10 Y66 includes: Premature cessation of surgical and medical care.
What codes are Type 1 Excludes for Y66? +
Type 1 Excludes (never code together with Y66): DNR status (Z66); palliative care (Z51.5)
What ICD-9 codes does Y66 map to? +
Per CMS GEMs, Y66 maps to ICD-9 codes: E8768. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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