New code ยท FY2026
Billable: use this code on claims.
- New code, effective October 1, 2025 (FY2026).
Code breakdown
T36.AX4S
- T36CategoryPoisoning by, adverse effect of and underdosing of systemic antibiotics
- ACharacter 4Poisoning by, adverse effect of and underdosing of fluoroquinolone antibiotics
- XCharacter 5Poisoning by, adverse effect of and underdosing of fluoroquinolone antibiotics
- 4Character 6Poisoning by fluoroquinolone antibiotics, undetermined
- S7th charactersequela
Coding notes
Excludes1 (from T36)
- antineoplastic antibiotics (T45.1-)
- locally applied antibiotic NEC (T49.0)
- topically used antibiotic for ear, nose and throat (T49.6)
- topically used antibiotic for eye (T49.5)
7th character (from T36)
- The appropriate 7th character is to be added to each code from category T36
7th characters (category T36)
- A initial encounter
- D subsequent encounter
- S sequela
Medicare coverage
T36.AX4S is listed as a covered diagnosis in 1 Medicare billing and coding article:
- A56948 Billing and Coding: Lab: Cystatin C Measurement
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ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.