T36.AX5A — Adverse effect of fluoroquinolone antibiotics, initial encounter
T36.AX5A is a billable, specific ICD-10-CM code for adverse effect of fluoroquinolone antibiotics, 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 T36
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Risk adjustment
T36.AX5A 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
T36.AX5A is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56538Billing and Coding: Allergen Immunotherapy
- A56558Billing and Coding: Allergy Testing
- A56558Billing and Coding: Allergy Testing
- A57361Billing and Coding: Monitored Anesthesia Care
Code history
What changed, and when. Derived by diffing consecutive CMS release files — which matters when you are defending a code assigned under an earlier edition.
- addedFY2024-FY2026
Adverse effect of fluoroquinolone antibiotics, initial encounter
Related codes at this level
Codes that share T36.AX5. If T36.AX5A is not quite right, the correct code is usually one of these.
Questions about T36.AX5A
- Is T36.AX5A a billable ICD-10-CM code?
- Yes. T36.AX5A is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does T36.AX5A 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).