ICD-10-CM 2027 diagnosis code

T44.0X6Underdosing of anticholinesterase agents

Not billable — use a more specific codeRequires 7th character

T44.0X6 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.

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 T44.0X6

T44.0X6 is the ICD-10-CM diagnosis code for underdosing of anticholinesterase agents. It belongs to category T44 (poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system), 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 T44.0X (poisoning by, adverse effect of and underdosing of anticholinesterase agents), T44.0X6 is specifically for underdosing of anticholinesterase agents. Related codes cover poisoning by anticholinesterase agents, accidental (unintentional) (T44.0X1), poisoning by anticholinesterase agents, intentional self-harm (T44.0X2), poisoning by anticholinesterase agents, assault (T44.0X3), poisoning by anticholinesterase agents, undetermined (T44.0X4) and adverse effect of anticholinesterase agents (T44.0X5).

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 T44

Ainitial encounterT44.0X6A
Dsubsequent encounterT44.0X6D
SsequelaT44.0X6S

Notes that apply from higher levels

Instructions written at a parent level also apply to T44.0X6.

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

Ambenonium (chloride) — Underdosing
Anticholinesterase — Underdosing
Anticholinesterase › organophosphorus — Underdosing
Anticholinesterase › reversible — Underdosing
Cholinergic (drug) NEC › organophosphorus — Underdosing
DFP — Underdosing
Diflos — Underdosing
Difluorophate — Underdosing
Diisopropylfluorophosphate — Underdosing
Distigmine (bromide) — Underdosing
Dyflos — Underdosing
Edrophonium — Underdosing
Edrophonium › chloride — Underdosing
Galantamine — Underdosing
Isoflurophate — Underdosing
Neomycin (derivatives) › with › neostigmine — Underdosing
Neostigmine bromide — Underdosing
Prostigmin — Underdosing
Pyridostigmine bromide — Underdosing
Tacrine — Underdosing
Tetrahydroaminoacridine — 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 T44.0X6

Is T44.0X6 billable?: No. T44.0X6 is a header code. Report one of its more specific subcodes instead.