ICD-10-CM 2027 diagnosis code

T50.6X6Underdosing of antidotes and chelating agents

Not billable — use a more specific codeRequires 7th character

T50.6X6 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.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About T50.6X6

T50.6X6 is the ICD-10-CM diagnosis code for underdosing of antidotes and chelating agents. It belongs to category T50 (poisoning by, adverse effect of and underdosing of diuretics and other and unspecified drugs, medicaments and biological substances), 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 T50.6X (poisoning by, adverse effect of and underdosing of antidotes and chelating agents), T50.6X6 is specifically for underdosing of antidotes and chelating agents. Related codes cover poisoning by antidotes and chelating agents, accidental (unintentional) (T50.6X1), poisoning by antidotes and chelating agents, intentional self-harm (T50.6X2), poisoning by antidotes and chelating agents, assault (T50.6X3), poisoning by antidotes and chelating agents, undetermined (T50.6X4) and adverse effect of antidotes and chelating agents (T50.6X5).

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 T50

Ainitial encounterT50.6X6A
Dsubsequent encounterT50.6X6D
SsequelaT50.6X6S

Notes that apply from higher levels

Instructions written at a parent level also apply to T50.6X6.

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

Alcohol › deterrent NEC — Underdosing
Antabuse — Underdosing
Antidote NEC — Underdosing
Calcium › carbimide — Underdosing
Chelating agent NEC — Underdosing
Cholinesterase reactivator — Underdosing
Cysteamine — Underdosing
Deterrent, alcohol — Underdosing
Detoxifying agent — Underdosing
Disodium edetate — Underdosing
Disulfiram — Underdosing
EDTA — Underdosing
Ethylenediaminetetra-acetic acid — Underdosing
Ethylenedinitrilotetra-acetate — Underdosing
Fytic acid, nonasodium — Underdosing
Glutathione — Underdosing
Methylene › blue — Underdosing
Methylthionine chloride — Underdosing
Methylthioninium chloride — Underdosing
Nitrefazole — Underdosing
Obidoxime chloride — Underdosing
PAM (pralidoxime) — Underdosing
Penicillamine — Underdosing
Potassium (salts) NEC › ferric hexacyanoferrate (medicinal) — Underdosing
Pralidoxime (iodide) — Underdosing
Pralidoxime (iodide) › chloride — Underdosing
Protopam — Underdosing
Prussian blue › therapeutic — Underdosing
Pyridine › aldoxime methiodide — Underdosing
Pyridine › aldoxime methyl chloride — Underdosing

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about T50.6X6

Is T50.6X6 billable?: No. T50.6X6 is a header code. Report one of its more specific subcodes instead.