Poisoning by, adverse effect of and underdosing of anesthetics and therapeutic gases

**Excludes1:** - benzodiazepines (T42.4-) - cocaine (T40.5-) - complications of anesthesia during pregnancy (O29.-) - complications of anesthesia during labor and delivery (O74.-) - complications of anesthesia during the puerperium (O89.-) - opioids (T40.0-T40.2-)

**7th character note:** - The appropriate 7th character is to be added to each code from category T41

**7th character:** - A: initial encounter - D: subsequent encounter - S: sequela