2024 ICD-10-CM Diagnosis Code T44.9

Poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system

ICD-10-CM Code:
T44.9
ICD-10 Code for:
And unsp drugs aff the autonomic nervous system
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
      (T36-T50)
      • Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system
        (T44)

T44.9 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system. The code is not specific and is NOT valid for the year 2024 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like T44.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Specific Coding Applicable to And unsp drugs aff the autonomic nervous system

Non-specific codes like T44.9 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for and unsp drugs aff the autonomic nervous system:

  • T44.90 for Poisoning by, adverse effect of and underdosing of unspecified drugs primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • T44.901 for Poisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional) - NON-BILLABLE CODE

  • Use T44.901A for initial encounter - BILLABLE CODE

  • Use T44.901D for subsequent encounter - BILLABLE CODE

  • Use T44.901S for sequela - BILLABLE CODE

  • T44.902 for Poisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm - NON-BILLABLE CODE

  • Use T44.902A for initial encounter - BILLABLE CODE

  • Use T44.902D for subsequent encounter - BILLABLE CODE

  • Use T44.902S for sequela - BILLABLE CODE

  • T44.903 for Poisoning by unspecified drugs primarily affecting the autonomic nervous system, assault - NON-BILLABLE CODE

  • Use T44.903A for initial encounter - BILLABLE CODE

  • Use T44.903D for subsequent encounter - BILLABLE CODE

  • Use T44.903S for sequela - BILLABLE CODE

  • T44.904 for Poisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined - NON-BILLABLE CODE

  • Use T44.904A for initial encounter - BILLABLE CODE

  • Use T44.904D for subsequent encounter - BILLABLE CODE

  • Use T44.904S for sequela - BILLABLE CODE

  • T44.905 for Adverse effect of unspecified drugs primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • Use T44.905A for initial encounter - BILLABLE CODE

  • Use T44.905D for subsequent encounter - BILLABLE CODE

  • Use T44.905S for sequela - BILLABLE CODE

  • T44.906 for Underdosing of unspecified drugs primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • Use T44.906A for initial encounter - BILLABLE CODE

  • Use T44.906D for subsequent encounter - BILLABLE CODE

  • Use T44.906S for sequela - BILLABLE CODE

  • T44.99 for Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • T44.991 for Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional) - NON-BILLABLE CODE

  • Use T44.991A for initial encounter - BILLABLE CODE

  • Use T44.991D for subsequent encounter - BILLABLE CODE

  • Use T44.991S for sequela - BILLABLE CODE

  • T44.992 for Poisoning by other drug primarily affecting the autonomic nervous system, intentional self-harm - NON-BILLABLE CODE

  • Use T44.992A for initial encounter - BILLABLE CODE

  • Use T44.992D for subsequent encounter - BILLABLE CODE

  • Use T44.992S for sequela - BILLABLE CODE

  • T44.993 for Poisoning by other drug primarily affecting the autonomic nervous system, assault - NON-BILLABLE CODE

  • Use T44.993A for initial encounter - BILLABLE CODE

  • Use T44.993D for subsequent encounter - BILLABLE CODE

  • Use T44.993S for sequela - BILLABLE CODE

  • T44.994 for Poisoning by other drug primarily affecting the autonomic nervous system, undetermined - NON-BILLABLE CODE

  • Use T44.994A for initial encounter - BILLABLE CODE

  • Use T44.994D for subsequent encounter - BILLABLE CODE

  • Use T44.994S for sequela - BILLABLE CODE

  • T44.995 for Adverse effect of other drug primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • Use T44.995A for initial encounter - BILLABLE CODE

  • Use T44.995D for subsequent encounter - BILLABLE CODE

  • Use T44.995S for sequela - BILLABLE CODE

  • T44.996 for Underdosing of other drug primarily affecting the autonomic nervous system - NON-BILLABLE CODE

  • Use T44.996A for initial encounter - BILLABLE CODE

  • Use T44.996D for subsequent encounter - BILLABLE CODE

  • Use T44.996S for sequela - BILLABLE CODE

Coding Guidelines

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined. If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of drugs primarily affecting the autonomic nervous system (T44). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Poisoning by, adverse effect of and underdosing of drug stimulating both alpha and beta-adrenoreceptors

Patient Education


Drug Reactions

Most of the time, medicines make our lives better. They reduce aches and pains, fight infections, and control problems such as high blood pressure or diabetes. But medicines can also cause unwanted reactions, such as drug interactions, side effects, and allergies.

What is a drug interaction?

A drug interaction is a change in the way a drug acts in the body when taken with certain other drugs, foods, or supplements or when taken while you have certain medical conditions. Examples include:

  • Two drugs, such as aspirin and blood thinners
  • Drugs and food, such as statins and grapefruit
  • Drugs and supplements, such as gingko and blood thinners
  • Drugs and medical conditions, such as aspirin and peptic ulcers

Interactions could cause a drug to be more or less effective, cause side effects, or change the way one or both drugs work.

What are side effects?

Side effects are unwanted, usually unpleasant, effects caused by medicines. Most are mild, such as a stomachache, dry mouth, or drowsiness, and go away after you stop taking the medicine. Others can be more serious. Sometimes a drug can interact with a disease that you have and cause a side effect. For example, if you have a heart condition, certain decongestants can cause you to have a rapid heartbeat.

What are drug allergies?

Drug allergies are another type of reaction. They can range from mild to life-threatening. Skin reactions, such as hives and rashes, are the most common type. Anaphylaxis, a serious allergic reaction, is less common.

How can I stay safe when taking medicines?

When you start a new prescription or over-the-counter medicine, make sure you understand how to take it correctly. Know which other medicines, foods, and supplements you need to avoid. Always talk to your health care provider or pharmacist if you have questions about your medicines.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.