Guidelines › Poisoning, adverse effects and the Table of Drugs

Poisoning, adverse effects and the Table of Drugs

Official text from the FY2027 ICD-10-CM Official Guidelines for Coding and Reporting. The wording is quoted exactly.

Guidelines I.C.19.e

“Codes in categories T36-T65 are combination codes that include the substance that was taken as well as the intent. No additional external cause code is required for poisonings, toxic effects, adverse effects and underdosing codes.”

“Do not code directly from the Table of Drugs and Chemicals. Always refer back to the Tabular List.”

“If the same code would describe the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, assign the code only once.”

Where this applies

T36–T65

4,866 billable codes. Source: FY 2027 ICD-10-CM Official Guidelines for Coding and Reporting, effective October 1, 2026. Full Guidelines (PDF, CMS)

The Guidelines are the authority for assigning codes, and following them is required under HIPAA. This page quotes them for convenience and is not a substitute for the official document. See the Terms and Disclaimer.