T49.8X1A — Poisoning by other topical agents, accidental (unintentional), initial encounter
T49.8X1A is a billable, specific ICD-10-CM code for poisoning by other topical agents, accidental (unintentional), 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 T49
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Poisoning by other topical agents NOS
Other codes that can never be billed with T49.8X1A
These codes carry an Excludes1 note pointing at T49.8X1A. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading T49.8X1A alone.
- T38.0Poisoning by, adverse effect of and underdosing of glucocorticoids and synthetic analogues
Risk adjustment
T49.8X1A 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
T49.8X1A is named in 4 Medicare coverage policies — 4 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
- A57205Billing and Coding: Oximetry Services
- A57473Billing and Coding: Allergy Testing
- A57473Billing and Coding: Allergy Testing
Code history
T49.8X1A has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share T49.8X1. If T49.8X1A is not quite right, the correct code is usually one of these.
Questions about T49.8X1A
- Is T49.8X1A a billable ICD-10-CM code?
- Yes. T49.8X1A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T49.8X1A 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).