Coding and coverage · ICD-10-CM

T33 Superficial frostbite

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

  • T33.0 Superficial frostbite of headHeader
  • T33.1 Superficial frostbite of neckHeader
  • T33.2 Superficial frostbite of thoraxHeader
  • T33.3 Superficial frostbite of abdominal wall, lower back and pelvisHeader
  • T33.4 Superficial frostbite of armHeader
  • T33.5 Superficial frostbite of wrist, hand, and fingersHeader
  • T33.6 Superficial frostbite of hip and thighHeader
  • T33.7 Superficial frostbite of knee and lower legHeader
  • T33.8 Superficial frostbite of ankle, foot, and toe(s)Header
  • T33.9 Superficial frostbite of other and unspecified sitesHeader

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
  • frostbite with partial thickness skin loss
7th charactersThe appropriate 7th character is to be added to each code from category T33
  • 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.