T36
ICD-10Non-billable categorySystemic antibiotics
Official ICD-10-CM descriptor (FY2026)
Poisoning by, adverse effect of and underdosing of systemic antibiotics
T36 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- 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
- The appropriate 7th character is to be added to each code from category T36
Permitted 7th characters
| A | initial encounter |
| D | subsequent encounter |
| S | sequela |
More specific codes under T36
- T36.0Penicillinscategory
- T36.1Cephalospor/oth beta-lactm antibioticscategory
- T36.2Chloramphenicol groupcategory
- T36.3Macrolidescategory
- T36.4Tetracyclinescategory
- T36.5Aminoglycosidescategory
- T36.6Rifampicinscategory
- T36.7Antifungal antibiotics, systemically usedcategory
- T36.8Systemic antibioticscategory
- T36.9Unsp systemic antibioticcategory
- T36.AFluoroquinolone antibioticscategory
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.