ICD-10-CM 2027 diagnosis code
T44.9Poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system
T44.9 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it and add the required 7th character.Short description: And unsp drugs aff the autonomic nervous system
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 T44.9
T44.9 is the ICD-10-CM diagnosis code for poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system. 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 2 subcodes must be used instead.
Within T44, choose T44.9 (other and unspecified drugs primarily affecting the autonomic nervous system) only when documentation doesn't support a more specific option: anticholinesterase agents (T44.0), other parasympathomimetics [cholinergics] (T44.1), ganglionic blocking drugs (T44.2), other parasympatholytics [anticholinergics and antimuscarinics] and spasmolytics (T44.3), predominantly alpha-adrenoreceptor agonists (T44.4), predominantly beta-adrenoreceptor agonists (T44.5), alpha-adrenoreceptor antagonists (T44.6), beta-adrenoreceptor antagonists (T44.7) and 1 more.
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
- T44.90Poisoning by, adverse effect of and underdosing of unspecified drugs primarily affecting the autonomic nervous system
- T44.901Poisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional)
- T44.902Poisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm
- T44.903Poisoning by unspecified drugs primarily affecting the autonomic nervous system, assault
- T44.904Poisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined
- T44.905Adverse effect of unspecified drugs primarily affecting the autonomic nervous system
- T44.906Underdosing of unspecified drugs primarily affecting the autonomic nervous system
- T44.99Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system
- T44.991Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional)
- T44.992Poisoning by other drug primarily affecting the autonomic nervous system, intentional self-harm
- T44.993Poisoning by other drug primarily affecting the autonomic nervous system, assault
- T44.994Poisoning by other drug primarily affecting the autonomic nervous system, undetermined
- T44.995Adverse effect of other drug primarily affecting the autonomic nervous system
- T44.996Underdosing of other drug primarily affecting the autonomic nervous system
- Ainitial encounter
- Dsubsequent encounter
- Ssequela
Coding notes
- Poisoning by, adverse effect of and underdosing of drug stimulating both alpha and beta-adrenoreceptors
Notes that apply from higher levels
Instructions written at a parent level also apply to T44.9.
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 T44.9
Is T44.9 billable?
- No. T44.9 is a header code. Report one of its more specific subcodes instead.