T50.905A — Adverse effect of unspecified drugs, medicaments and biological substances, initial encounter
T50.905A is a billable, specific ICD-10-CM code for adverse effect of unspecified drugs, medicaments and biological substances, 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 T50
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
T50.905A 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
T50.905A is named in 15 Medicare coverage policies — 15 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
- A56625Billing and Coding: Echocardiography
- A56645Billing and Coding: Controlled Substance Monitoring and Drugs of Abuse Testing
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
Related codes at this level
Codes that share T50.905. If T50.905A is not quite right, the correct code is usually one of these.
Questions about T50.905A
- Is T50.905A a billable ICD-10-CM code?
- Yes. T50.905A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T50.905A 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).