Is ICD-10-CM code Y66 billable?

Yes, Y66 (Nonadministration of surgical and medical care) is a billable ICD-10-CM diagnosis code, valid for reimbursement on HIPAA-covered transactions for FY2026.

What chapter does ICD-10-CM code Y66 belong to?

Y66 belongs to Chapter 20 of the ICD-10-CM tabular list: V00–Y99 (External Causes of Morbidity).

Y66Billable

Nonadministration of surgical and medical care

External Causes of Morbidity·Misadventures to patients during surgical and medical care (Y62-Y69)·category·FY 2026

Y62-Y69 Parent Instructions

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)

Instructional Notes

Includes

Premature cessation of surgical and medical care

Excludes1(Not coded here. Use a different code.)

DNR status (Z66)
palliative care (Z51.5)

Clinical Hierarchy

BillableHas subcodes

CH20External causes of morbidity (V00-Y99)

Y62-Y69Misadventures to patients during surgical and medical care (Y62-Y69)

Y66Nonadministration of surgical and medical careBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.