2021 ICD-10-CM Code T37.8

Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics

Version 2021
Replaced Code
Non-Billable Code

Not Valid for Submission

T37.8 is a "header" nonspecific 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 specified systemic anti-infectives and antiparasitics. The code is NOT valid for the year 2021 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.

ICD-10:T37.8
Short Description:Systemic anti-infectives and antiparasitics
Long Description:Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics

Code Classification

Specific Coding for Systemic anti-infectives and antiparasitics

Header codes like T37.8 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for systemic anti-infectives and antiparasitics:

  • T37.8X - Poisoning by, adverse effect of and underdosing of other specified systemic anti-infectives and antiparasitics
  • T37.8X1 - Poisoning by other specified systemic anti-infectives and antiparasitics, accidental (unintentional)
  • T37.8X1A - Poisoning by other specified systemic anti-infectives and antiparasitics, accidental (unintentional), initial encounter
  • T37.8X1D - Poisoning by other specified systemic anti-infectives and antiparasitics, accidental (unintentional), subsequent encounter
  • T37.8X1S - Poisoning by other specified systemic anti-infectives and antiparasitics, accidental (unintentional), sequela
  • T37.8X2 - Poisoning by other specified systemic anti-infectives and antiparasitics, intentional self-harm
  • T37.8X2A - Poisoning by other specified systemic anti-infectives and antiparasitics, intentional self-harm, initial encounter
  • T37.8X2D - Poisoning by other specified systemic anti-infectives and antiparasitics, intentional self-harm, subsequent encounter
  • T37.8X2S - Poisoning by other specified systemic anti-infectives and antiparasitics, intentional self-harm, sequela
  • T37.8X3 - Poisoning by other specified systemic anti-infectives and antiparasitics, assault
  • T37.8X3A - Poisoning by other specified systemic anti-infectives and antiparasitics, assault, initial encounter
  • T37.8X3D - Poisoning by other specified systemic anti-infectives and antiparasitics, assault, subsequent encounter
  • T37.8X3S - Poisoning by other specified systemic anti-infectives and antiparasitics, assault, sequela
  • T37.8X4 - Poisoning by other specified systemic anti-infectives and antiparasitics, undetermined
  • T37.8X4A - Poisoning by other specified systemic anti-infectives and antiparasitics, undetermined, initial encounter
  • T37.8X4D - Poisoning by other specified systemic anti-infectives and antiparasitics, undetermined, subsequent encounter
  • T37.8X4S - Poisoning by other specified systemic anti-infectives and antiparasitics, undetermined, sequela
  • T37.8X5 - Adverse effect of other specified systemic anti-infectives and antiparasitics
  • T37.8X5A - Adverse effect of other specified systemic anti-infectives and antiparasitics, initial encounter
  • T37.8X5D - Adverse effect of other specified systemic anti-infectives and antiparasitics, subsequent encounter
  • T37.8X5S - Adverse effect of other specified systemic anti-infectives and antiparasitics, sequela
  • T37.8X6 - Underdosing of other specified systemic anti-infectives and antiparasitics
  • T37.8X6A - Underdosing of other specified systemic anti-infectives and antiparasitics, initial encounter
  • T37.8X6D - Underdosing of other specified systemic anti-infectives and antiparasitics, subsequent encounter
  • T37.8X6S - Underdosing of other specified systemic anti-infectives and antiparasitics, sequela

Replaced Code

This code was replaced in the 2021 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2020. This code was replaced for the FY 2021 (October 1, 2020 - September 30, 2021).


  • K59.03 - Drug induced constipation

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code T37.8:


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.

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

Information for Patients


Drug Reactions

Also called: Side effects

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.

One problem is interactions, which may occur between

Interactions can change the actions of one or both drugs. The drugs might not work, or you could get side effects.

Side effects are unwanted effects caused by the drugs. Most are mild, such as a stomach aches or drowsiness, and go away after you stop taking the drug. Others can be more serious.

Drug allergies are another type of reaction. They can be mild or life-threatening. Skin reactions, such as hives and rashes, are the most common type. Anaphylaxis, a serious allergic reaction, is more rare.

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


[Learn More in MedlinePlus]

Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)