T43.3: Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics
T43.3 is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics. 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 T43
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes2 inherited from the categories above T43.3
Not part of this code, but both may be coded when both are present.
Written on T43: Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified
Other codes that can never be billed with T43.3
Their own Excludes1 notes name this code, so the conflict is not listed above.
- T45.0Poisoning by, adverse effect of and underdosing of antiallergic and antiemetic drugs
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead T43.3
1 child code. Green means billable.
Other codes under T43
- T43.0Poisoning by, adverse effect of and underdosing of tricyclic and tetracyclic antidepressants
- T43.1Poisoning by, adverse effect of and underdosing of monoamine-oxidase-inhibitor antidepressants
- T43.2Poisoning by, adverse effect of and underdosing of other and unspecified antidepressants
- T43.4Poisoning by, adverse effect of and underdosing of butyrophenone and thiothixene neuroleptics
- T43.5Poisoning by, adverse effect of and underdosing of other and unspecified antipsychotics and neuroleptics
- T43.6Poisoning by, adverse effect of and underdosing of psychostimulants
- T43.8Poisoning by, adverse effect of and underdosing of other psychotropic drugs
- T43.9Poisoning by, adverse effect of and underdosing of unspecified psychotropic drug