T40 — Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
T40 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category T40
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Other codes that can never be billed with T40
These codes carry an Excludes1 note pointing at T40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T40 alone.
Risk adjustment
T40 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code to one of these instead T40
10 child codes. Green means billable.
- T40.0Poisoning by, adverse effect of and underdosing of opium
- T40.1Poisoning by and adverse effect of heroin
- T40.2Poisoning by, adverse effect of and underdosing of other opioids
- T40.3Poisoning by, adverse effect of and underdosing of methadone
- T40.4Poisoning by, adverse effect of and underdosing of other synthetic narcotics
- T40.5Poisoning by, adverse effect of and underdosing of cocaine
- T40.6Poisoning by, adverse effect of and underdosing of other and unspecified narcotics
- T40.7Poisoning by, adverse effect of and underdosing of cannabis (derivatives)
- T40.8Poisoning by and adverse effect of lysergide [LSD]
- T40.9Poisoning by, adverse effect of and underdosing of other and unspecified psychodysleptics [hallucinogens]
Questions about T40
- Is T40 a billable ICD-10-CM code?
- No. T40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T40 sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).