T43.8X5A — Adverse effect of other psychotropic drugs, initial encounter
T43.8X5A is a billable, specific ICD-10-CM code for adverse effect of other psychotropic drugs, initial encounter. It is valid for submission on a claim.
7th character "A" — initial encounter
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 T43.8X5A
Also inherited, and the opposite of Excludes1: these conditions are not part of T43.8X5A, but a patient can have both, so you may code both.
Written on T43 — Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified
Risk adjustment
T43.8X5A 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.
Medicare coverage
T43.8X5A is named in 18 Medicare coverage policies — 18 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
- A56645Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing
- A56844Billing and Coding: RAST Type Tests
- A57043Billing and Coding: RAST Type Tests
Code history
T43.8X5A has not changed since FY2024 — no addition, revision or deletion across the FY2024–FY2027 ICD-10-CM releases.
Related codes at this level
Codes that share T43.8X5. If T43.8X5A is not quite right, the correct code is usually one of these.
Questions about T43.8X5A
- Is T43.8X5A a billable ICD-10-CM code?
- Yes. T43.8X5A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T43.8X5A 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).