T40
Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 3 never code together
T40code
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 3
S00-T88chapter
Notes
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here filed at null
No alphabetic index entry points at this code.
Subordinate codes 10
T40.0 Poisoning by, adverse effect of and underdosing of opium T40.1 Poisoning by and adverse effect of heroin T40.2 Poisoning by, adverse effect of and underdosing of opioids T40.3 Poisoning by, adverse effect of and underdosing of methadone T40.4 Synthetic narcotics T40.5 Poisoning by, adverse effect of and underdosing of cocaine T40.6 And unsp narcotics T40.7 Cannabis (derivatives) T40.8 Poisoning by and adverse effect of lysergide [LSD] T40.9 And unsp psychodysleptics
Medications 1
MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.