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ICD-10-CM 2027 diagnosis code

T36Poisoning by, adverse effect of and underdosing of systemic antibiotics

Not billable — use a more specific code

T36 is a header code, so it can't be reported by itself. Choose one of the 11 more specific codes beneath it.Short description: Systemic antibiotics

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T36

T36 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of systemic antibiotics. It belongs to block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 11 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: T36.0 (penicillins), T36.1 (antibiotics), T36.2 (group), T36.3 (macrolides), T36.4 (tetracyclines), T36.5 (aminoglycosides), T36.6 (rifampicins), T36.7 (used) and 3 more.

Don't report T36 together with the conditions in its Excludes1 note: antineoplastic antibiotics (T45.1-), locally applied antibiotic NEC (T49.0), topically used antibiotic for ear, nose and throat (T49.6) and topically used antibiotic for eye (T49.5).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under T36

Coding notes

Excludes1Not coded here — never report together with this code
  • 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)

Notes that apply from higher levels

Instructions written at a parent level also apply to T36.

Broader instructions also apply from T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Codes whose notes reference T36

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T36

Is T36 billable?

No. T36 is a header code. Report one of its more specific subcodes instead.