Poisoning, Adverse Effect and Underdosing Flowchart (ICD-10-CM Cheat Sheet)

A two-page quick reference for coding drug reactions in ICD-10-CM. A flowchart walks you from the documentation to the right answer: adverse effect, poisoning, underdosing, or toxic effect, and which code goes first.

WHAT'S INSIDE

• Page 1: the decision flowchart, the four poisoning intents (and when "undetermined" is allowed), how to read the six columns of the Table of Drugs and Chemicals, and what to do with two or more drugs or a drug taken with alcohol
• Page 2: how a T code is built (the X placeholder, the intent or use character, and the 7th character A, D, or S), the codes that explain why a dose was missed, carbon monoxide codes by source, common mistakes, and 5 worked examples

FILE FORMAT

• One PDF, US Letter (8.5 x 11 inches), 2 pages. Print it or keep it open on your screen.

HOW IT WORKS

Your download link appears right after payment and is emailed to you.

GOOD TO KNOW

• Based on the FY2027 ICD-10-CM code set and Official Guidelines (in effect October 1, 2026 to September 30, 2027). Codes change every October, so check the current year.
• This guide covers ICD-10-CM diagnosis coding only. It has no CPT procedure codes.
• Educational reference, not legal or billing advice. Payers and facilities can add their own rules.
• AAPC doesn't allow extra notes or printouts in exam code books, so this is a study aid and work reference, not an exam aid.
• Not affiliated with or endorsed by CMS, NCHS, AHA, AAPC, or AHIMA.
• Digital items generally can't be returned. If a file is missing, damaged, or different from this listing, email thedenialdesk@gmail.com and I'll help sort it out.
• Drafted with help from AI tools, then reviewed and fact-checked by a certified medical coding professional.

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