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ICD-10-CM 2027 diagnosis code

T36.91Poisoning by unspecified systemic antibiotic, accidental (unintentional)

Not billable — use a more specific codeRequires 7th character

T36.91 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.Short description: Poisoning by unsp systemic antibiotic, accidental

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 T36.91

T36.91 is the ICD-10-CM diagnosis code for poisoning by unspecified systemic antibiotic, accidental (unintentional). It belongs to category T36 (poisoning by, adverse effect of and underdosing of systemic antibiotics), 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 3 subcodes must be used instead.

Within T36.9, choose T36.91 (Poisoning by unspecified systemic antibiotic, accidental (unintentional)) only when documentation doesn't support a more specific option: poisoning by unspecified systemic antibiotic, intentional self-harm (T36.92), poisoning by unspecified systemic antibiotic, assault (T36.93), poisoning by unspecified systemic antibiotic, undetermined (T36.94), adverse effect of unspecified systemic antibiotic (T36.95) and underdosing of unspecified systemic antibiotic (T36.96).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

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

7th character

The appropriate 7th character is to be added to each code from category T36

Coding notes

Applicable toConditions and synonyms classified to this code
  • Poisoning by systemic antibiotic NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T36.91.

› From T36 Poisoning by, adverse effect of and underdosing of systemic antibiotics
Excludes1
  • 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)

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.

Table of Drugs & Neoplasms entries

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 T36.91

Is T36.91 billable?

No. T36.91 is a header code. Report one of its more specific subcodes instead.