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ICD-10-CM 2027 diagnosis code

T49.5X4Poisoning by ophthalmological drugs and preparations, undetermined

Not billable — use a more specific codeRequires 7th character

T49.5X4 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 opth drugs and preparations, undetermined

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About T49.5X4

T49.5X4 is the ICD-10-CM diagnosis code for poisoning by ophthalmological drugs and preparations, undetermined. 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 T49.5X (poisoning by, adverse effect of and underdosing of ophthalmological drugs and preparations), T49.5X4 is specifically for poisoning by ophthalmological drugs and preparations, undetermined. Related codes cover poisoning by ophthalmological drugs and preparations, accidental (unintentional) (T49.5X1), poisoning by ophthalmological drugs and preparations, intentional self-harm (T49.5X2), poisoning by ophthalmological drugs and preparations, assault (T49.5X3), adverse effect of ophthalmological drugs and preparations (T49.5X5) and underdosing of ophthalmological drugs and preparations (T49.5X6).

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

Notes that apply from higher levels

Instructions written at a parent level also apply to T49.5X4.

› 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 T49.5X4

Is T49.5X4 billable?

No. T49.5X4 is a header code. Report one of its more specific subcodes instead.