T40.416S
✓ Billable
Underdosing of fentanyl or fentanyl analogs, sequela
ICD-10-CM · FY2026 · Injury, Poisoning and Certain Other Consequences of External Causes
Code
T40.416S
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Injury, Poisoning and Certain Other Consequences of External Causes
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code T40.416S?
ICD-10-CM code T40.416S represents Underdosing of fentanyl or fentanyl analogs, sequela. It is a billable diagnosis code in the Injury, Poisoning and Certain Other Consequences of External Causes chapter, effective October 1, 2025 – September 30, 2026.
Is T40.416S billable?
Yes. T40.416S is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is T40.416S in?
T40.416S belongs to the Injury, Poisoning and Certain Other Consequences of External Causes chapter (S00–T88) of ICD-10-CM.
Related codes in the T40 category
T40
Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
Non-billable
T40.0
Poisoning by, adverse effect of and underdosing of opium
Non-billable
T40.1
Poisoning by and adverse effect of heroin
Non-billable
T40.2
Poisoning by, adverse effect of and underdosing of other opioids
Non-billable
T40.3
Poisoning by, adverse effect of and underdosing of methadone
Non-billable
T40.4
Poisoning by, adverse effect of and underdosing of other synthetic narcotics
Non-billable
T40.5
Poisoning by, adverse effect of and underdosing of cocaine
Non-billable
T40.6
Poisoning by, adverse effect of and underdosing of other and unspecified narcotics
Non-billable
Search all 98,186 ICD-10-CM codes instantly
Search ICDwise →