ICD-10 Code T40.416A - Underdosing of fentanyl or fentanyl analogs, initial encounter

ICD-10-CM Diagnosis Code T40.416A

Diagnosis Code: T40.416A (Raw: T40416A)

Description: Underdosing of fentanyl or fentanyl analogs, initial encounter

Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)

Fiscal Year: 2026

CMS Section 111 Status: Valid for reporting.

Overview & Clinical Details

ICD-10-CM code T40.416A is designated for Underdosing of fentanyl or fentanyl analogs, initial encounter. In medical documentation and insurance billing, this code is utilized to specify medical diagnosis for patient records, reimbursement workflows, and compliance under CMS Section 111 mandatory insurer reporting guidelines.