Coding and coverage · ICD-10-CM

T49 Poisoning by, adverse effect of and underdosing of topical agents primarily affecting skin and mucous membrane and by ophthalmological, otorhinorlaryngological and dental drugs

Not billable (header)Chapter 19

This code needs a 7th character (use X as a placeholder for missing characters).

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Codes under this one

  • T49.0 Poisoning by, adverse effect of and underdosing of local antifungal, anti-infective and anti-inflammatory drugsHeader
  • T49.1 Poisoning by, adverse effect of and underdosing of antipruriticsHeader
  • T49.2 Poisoning by, adverse effect of and underdosing of local astringents and local detergentsHeader
  • T49.3 Poisoning by, adverse effect of and underdosing of emollients, demulcents and protectantsHeader
  • T49.4 Poisoning by, adverse effect of and underdosing of keratolytics, keratoplastics, and other hair treatment drugs and preparationsHeader
  • T49.5 Poisoning by, adverse effect of and underdosing of ophthalmological drugs and preparationsHeader
  • T49.6 Poisoning by, adverse effect of and underdosing of otorhinolaryngological drugs and preparationsHeader
  • T49.7 Poisoning by, adverse effect of and underdosing of dental drugs, topically appliedHeader
  • T49.8 Poisoning by, adverse effect of and underdosing of other topical agentsHeader
  • T49.9 Poisoning by, adverse effect of and underdosing of unspecified topical agentHeader

Instructional notes

Chapter 19

Excludes2Not included here: the patient may have both; report both when both are present.
Use additional codeAdd a second code for the full picture.
  • code to identify any retained foreign body, if applicable (Z18.-)
Notes
  • Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
  • The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.

This code

Includes
  • poisoning by, adverse effect of and underdosing of glucocorticoids, topically used
7th charactersThe appropriate 7th character is to be added to each code from category T49
  • A initial encounter
  • D subsequent encounter
  • S sequela

Chapter 19: Injury, poisoning and certain other consequences of external causes · T07-T88 Injury, poisoning and certain other consequences of external causes (T07-T88)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.