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ICD-10-CM 2027 diagnosis code

T49.4X1Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional)

Not billable — use a more specific codeRequires 7th character

T49.4X1 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.Short description: Poisoning by keratolyt/keratplst/hair trmt drug, accidental

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 T49.4X1

T49.4X1 is the ICD-10-CM diagnosis code for poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional). It belongs to category T49 (poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs), 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 T49.4X, choose T49.4X1 (Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, accidental (unintentional)) only when documentation doesn't support a more specific option: poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, intentional self-harm (T49.4X2), poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, assault (T49.4X3), poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined (T49.4X4), adverse effect of keratolytics, keratoplastics, and other hair treatment drugs and preparations (T49.4X5) and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparations (T49.4X6).

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 T49

Coding notes

Applicable toConditions and synonyms classified to this code
  • Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T49.4X1.

› From T49 Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs
Includes
  • poisoning by, adverse effect of and underdosing of glucocorticoids, topically used

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

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about T49.4X1

Is T49.4X1 billable?

No. T49.4X1 is a header code. Report one of its more specific subcodes instead.