ICD-10-CM 2027 diagnosis code

T37.4X6Underdosing of anthelminthics

Not billable — use a more specific codeRequires 7th character

T37.4X6 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 T37.4X6

T37.4X6 is the ICD-10-CM diagnosis code for underdosing of anthelminthics. It belongs to category T37 (poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics), 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 T37.4X (poisoning by, adverse effect of and underdosing of anthelminthics), T37.4X6 is specifically for underdosing of anthelminthics. Related codes cover poisoning by anthelminthics, accidental (unintentional) (T37.4X1), poisoning by anthelminthics, intentional self-harm (T37.4X2), poisoning by anthelminthics, assault (T37.4X3), poisoning by anthelminthics, undetermined (T37.4X4) and adverse effect of anthelminthics (T37.4X5).

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 T37

Ainitial encounterT37.4X6A
Dsubsequent encounterT37.4X6D
SsequelaT37.4X6S

Notes that apply from higher levels

Instructions written at a parent level also apply to T37.4X6.

› From T37 Poisoning by, adverse effect of and underdosing of other systemic anti-infectives and antiparasitics

Excludes1

anti-infectives topically used for ear, nose and throat (T49.6-)
anti-infectives topically used for eye (T49.5-)
locally applied anti-infectives NEC (T49.0-)

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

Alantolactone — Underdosing
Albendazole — Underdosing
Amphotalide — Underdosing
Anthelmintic NEC — Underdosing
Anthiolimine — Underdosing
Antifilarial drug — Underdosing
Antihelmintics — Underdosing
Antihookworm drug — Underdosing
Anti-infective NEC › anthelmintic — Underdosing
Antinematode drug — Underdosing
Antiplatyhelmintic drug — Underdosing
Antischistosomal drug — Underdosing
Antitapeworm drug — Underdosing
Antiwhipworm drug — Underdosing
Ascaridole — Underdosing
Aspidium (oleoresin) — Underdosing
Bephenium hydroxy-naphthoate — Underdosing
Bithionol › anthelmintic — Underdosing
Bitoscanate — Underdosing
Chenopodium — Underdosing
Dichlorophen — Underdosing
Diethyl › carbamazine — Underdosing
Diethylcarbamazine — Underdosing
Dithiazanine iodide — Underdosing
Fenbendazole — Underdosing
Filix mas — Underdosing
Flubendazole — Underdosing
Helenin — Underdosing
Ivermectin — Underdosing
Levamisole — 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 T37.4X6

Is T37.4X6 billable?: No. T37.4X6 is a header code. Report one of its more specific subcodes instead.