T37.91
Poisoning by unspecified systemic anti-infective and antiparasitics, accidental (unintentional)
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 5 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 5 never code together
T37code
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 4
T37.91code
Inclusion terms
- Poisoning by, adverse effect of and underdosing of systemic anti-infective and antiparasitics NOS
S00-T88chapter
Notes
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 5 same parent — T37.9
T37.92 Poisn by unsp systemic anti-infect and antiparastc, slf-hrm category T37.93 Poisn by unsp systemic anti-infect and antiparastc, assault category T37.94 Poisn by unsp systemic anti-infect and antiparastc, undet category T37.95 Adverse effect of unsp sys anti-infect and antiparasitic category T37.96 Underdosing of unsp systemic anti-infect/parasit category
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.