2026 ICD-10-CM Diagnosis Code T33Superficial frostbite

ICD-10-CM Codes›S00–T88›T33-T34›T33

ICD-10-CM T33
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T33 is a non-billable ICD-10-CM category code for superficial frostbite, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T33.011A, T33.011D, T33.011S, and T33.012A.

Code Identity

ICD-10-CM Code
T33
Billable Status
No — Non-Billable Category
Code Describes
Superficial frostbite
Chapter
T33-T34
Frostbite

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT33-T34Frostbite
CategoryT33Superficial frostbite
This CodeT33Superficial frostbite

Specific Coding for Superficial frostbiteOverview

Non-specific codes like T33 require more characters. Use one of these billable codes instead:

  • T33.0 for Superficial frostbite of head

  • T33.01 for Superficial frostbite of ear

  • T33.02 for Superficial frostbite of nose

  • T33.09 for Superficial frostbite of other part of head

  • T33.1 for Superficial frostbite of neck

  • T33.2 for Superficial frostbite of thorax

  • T33.3 for Superficial frostbite of abdominal wall, lower back and pelvis

  • T33.4 for Superficial frostbite of arm

  • T33.40 for Superficial frostbite of unspecified arm

  • T33.41 for Superficial frostbite of right arm

  • T33.42 for Superficial frostbite of left arm

  • T33.5 for Superficial frostbite of wrist, hand, and fingers

  • T33.51 for Superficial frostbite of wrist

  • T33.52 for Superficial frostbite of hand

  • T33.53 for Superficial frostbite of finger(s)

  • T33.6 for Superficial frostbite of hip and thigh

  • T33.60 for Superficial frostbite of unspecified hip and thigh

  • T33.61 for Superficial frostbite of right hip and thigh

  • T33.62 for Superficial frostbite of left hip and thigh

  • T33.7 for Superficial frostbite of knee and lower leg

  • T33.70 for Superficial frostbite of unspecified knee and lower leg

  • T33.71 for Superficial frostbite of right knee and lower leg

  • T33.72 for Superficial frostbite of left knee and lower leg

  • T33.8 for Superficial frostbite of ankle, foot, and toe(s)

  • T33.81 for Superficial frostbite of ankle

  • T33.82 for Superficial frostbite of foot

  • T33.83 for Superficial frostbite of toe(s)

  • T33.9 for Superficial frostbite of other and unspecified sites

  • T33.90 for Superficial frostbite of unspecified sites

  • T33.99 for Superficial frostbite of other sites

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Superficial frostbite (T33). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • frostbite with partial thickness skin loss

7th Character Note

  • The appropriate 7th character is to be added to each code from category T33

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Patient EducationClinical

Frostbite

Frostbite is an injury to the body that is caused by freezing. It most often affects the nose, ears, cheeks, chin, fingers, or toes. Frostbite can permanently damage the body, and severe cases can lead to amputation.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T33Overview

Is T33 (Superficial frostbite) a billable code?

No. This is a category header that groups the codes for superficial frostbite, and headers cannot be submitted on claims. Claims for superficial frostbite need a more specific code from this category, such as T33.011A, T33.011D, and T33.011S.