ICD-10-CM Tabular Index · Chapter 19 · FY 2026 T33
Superficial frostbite (T33) ICD-10-CM
The T33 code range covers superficial frostbite with 163 ICD-10-CM diagnosis codes. 111 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
163
Diagnosis Codes
111
Billable Codes
T33
Code Range
T33–T34
Parent Section
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- frostbite with partial thickness skin loss
7th Character Note
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
- The appropriate 7th character is to be added to each code from category T33
7th Character
Indicates that a seventh character is to be assigned to codes in a subcategory.
- A - initial encounter
- D - subsequent encounter
- S - sequela
ICD-10-CM
Codes in the T33 Range 163 codes · 111 billable
163 of 163 shown
- T33 Superficial frostbiteNon-billable
- T33.0 Superficial frostbite of headNon-billable
- T33.01 Superficial frostbite of earNon-billable
- T33.011 Superficial frostbite of right earNon-billable
- T33.011A Superficial frostbite of right ear, initial encounter
- T33.011D Superficial frostbite of right ear, subsequent encounter
- T33.011S Superficial frostbite of right ear, sequela
- T33.012 Superficial frostbite of left earNon-billable
- T33.012A Superficial frostbite of left ear, initial encounter
- T33.012D Superficial frostbite of left ear, subsequent encounter
- T33.012S Superficial frostbite of left ear, sequela
- T33.019 Superficial frostbite of unspecified earNon-billable
- T33.019A Superficial frostbite of unspecified ear, initial encounter
- T33.019D Superficial frostbite of unspecified ear, subsequent encounter
- T33.019S Superficial frostbite of unspecified ear, sequela
- T33.02 Superficial frostbite of noseNon-billable
- T33.02XA Superficial frostbite of nose, initial encounter
- T33.02XD Superficial frostbite of nose, subsequent encounter
- T33.02XS Superficial frostbite of nose, sequela
- T33.09 Superficial frostbite of other part of headNon-billable
- T33.09XA Superficial frostbite of other part of head, initial encounter
- T33.09XD Superficial frostbite of other part of head, subsequent encounter
- T33.09XS Superficial frostbite of other part of head, sequela
- T33.1 Superficial frostbite of neckNon-billable
- T33.1XXA Superficial frostbite of neck, initial encounter
- T33.1XXD Superficial frostbite of neck, subsequent encounter
- T33.1XXS Superficial frostbite of neck, sequela
- T33.2 Superficial frostbite of thoraxNon-billable
- T33.2XXA Superficial frostbite of thorax, initial encounter
- T33.2XXD Superficial frostbite of thorax, subsequent encounter
- T33.2XXS Superficial frostbite of thorax, sequela
- T33.3 Superficial frostbite of abdominal wall, lower back and pelvisNon-billable
- T33.3XXA Superficial frostbite of abdominal wall, lower back and pelvis, initial encounter
- T33.3XXD Superficial frostbite of abdominal wall, lower back and pelvis, subsequent encounter
- T33.3XXS Superficial frostbite of abdominal wall, lower back and pelvis, sequela
- T33.4 Superficial frostbite of armNon-billable
- T33.40 Superficial frostbite of unspecified armNon-billable
- T33.40XA Superficial frostbite of unspecified arm, initial encounter
- T33.40XD Superficial frostbite of unspecified arm, subsequent encounter
- T33.40XS Superficial frostbite of unspecified arm, sequela
- T33.41 Superficial frostbite of right armNon-billable
- T33.41XA Superficial frostbite of right arm, initial encounter
- T33.41XD Superficial frostbite of right arm, subsequent encounter
- T33.41XS Superficial frostbite of right arm, sequela
- T33.42 Superficial frostbite of left armNon-billable
- T33.42XA Superficial frostbite of left arm, initial encounter
- T33.42XD Superficial frostbite of left arm, subsequent encounter
- T33.42XS Superficial frostbite of left arm, sequela
- T33.5 Superficial frostbite of wrist, hand, and fingersNon-billable
- T33.51 Superficial frostbite of wristNon-billable
- T33.511 Superficial frostbite of right wristNon-billable
- T33.511A Superficial frostbite of right wrist, initial encounter
- T33.511D Superficial frostbite of right wrist, subsequent encounter
- T33.511S Superficial frostbite of right wrist, sequela
- T33.512 Superficial frostbite of left wristNon-billable
- T33.512A Superficial frostbite of left wrist, initial encounter
- T33.512D Superficial frostbite of left wrist, subsequent encounter
- T33.512S Superficial frostbite of left wrist, sequela
- T33.519 Superficial frostbite of unspecified wristNon-billable
- T33.519A Superficial frostbite of unspecified wrist, initial encounter
- T33.519D Superficial frostbite of unspecified wrist, subsequent encounter
- T33.519S Superficial frostbite of unspecified wrist, sequela
- T33.52 Superficial frostbite of handNon-billable
- T33.521 Superficial frostbite of right handNon-billable
- T33.521A Superficial frostbite of right hand, initial encounter
- T33.521D Superficial frostbite of right hand, subsequent encounter
- T33.521S Superficial frostbite of right hand, sequela
- T33.522 Superficial frostbite of left handNon-billable
- T33.522A Superficial frostbite of left hand, initial encounter
- T33.522D Superficial frostbite of left hand, subsequent encounter
- T33.522S Superficial frostbite of left hand, sequela
- T33.529 Superficial frostbite of unspecified handNon-billable
- T33.529A Superficial frostbite of unspecified hand, initial encounter
- T33.529D Superficial frostbite of unspecified hand, subsequent encounter
- T33.529S Superficial frostbite of unspecified hand, sequela
- T33.53 Superficial frostbite of finger(s)Non-billable
- T33.531 Superficial frostbite of right finger(s)Non-billable
- T33.531A Superficial frostbite of right finger(s), initial encounter
- T33.531D Superficial frostbite of right finger(s), subsequent encounter
- T33.531S Superficial frostbite of right finger(s), sequela
- T33.532 Superficial frostbite of left finger(s)Non-billable
- T33.532A Superficial frostbite of left finger(s), initial encounter
- T33.532D Superficial frostbite of left finger(s), subsequent encounter
- T33.532S Superficial frostbite of left finger(s), sequela
- T33.539 Superficial frostbite of unspecified finger(s)Non-billable
- T33.539A Superficial frostbite of unspecified finger(s), initial encounter
- T33.539D Superficial frostbite of unspecified finger(s), subsequent encounter
- T33.539S Superficial frostbite of unspecified finger(s), sequela
- T33.6 Superficial frostbite of hip and thighNon-billable
- T33.60 Superficial frostbite of unspecified hip and thighNon-billable
- T33.60XA Superficial frostbite of unspecified hip and thigh, initial encounter
- T33.60XD Superficial frostbite of unspecified hip and thigh, subsequent encounter
- T33.60XS Superficial frostbite of unspecified hip and thigh, sequela
- T33.61 Superficial frostbite of right hip and thighNon-billable
- T33.61XA Superficial frostbite of right hip and thigh, initial encounter
- T33.61XD Superficial frostbite of right hip and thigh, subsequent encounter
- T33.61XS Superficial frostbite of right hip and thigh, sequela
- T33.62 Superficial frostbite of left hip and thighNon-billable
- T33.62XA Superficial frostbite of left hip and thigh, initial encounter
- T33.62XD Superficial frostbite of left hip and thigh, subsequent encounter
- T33.62XS Superficial frostbite of left hip and thigh, sequela
- T33.7 Superficial frostbite of knee and lower legNon-billable
- T33.70 Superficial frostbite of unspecified knee and lower legNon-billable
- T33.70XA Superficial frostbite of unspecified knee and lower leg, initial encounter
- T33.70XD Superficial frostbite of unspecified knee and lower leg, subsequent encounter
- T33.70XS Superficial frostbite of unspecified knee and lower leg, sequela
- T33.71 Superficial frostbite of right knee and lower legNon-billable
- T33.71XA Superficial frostbite of right knee and lower leg, initial encounter
- T33.71XD Superficial frostbite of right knee and lower leg, subsequent encounter
- T33.71XS Superficial frostbite of right knee and lower leg, sequela
- T33.72 Superficial frostbite of left knee and lower legNon-billable
- T33.72XA Superficial frostbite of left knee and lower leg, initial encounter
- T33.72XD Superficial frostbite of left knee and lower leg, subsequent encounter
- T33.72XS Superficial frostbite of left knee and lower leg, sequela
- T33.8 Superficial frostbite of ankle, foot, and toe(s)Non-billable
- T33.81 Superficial frostbite of ankleNon-billable
- T33.811 Superficial frostbite of right ankleNon-billable
- T33.811A Superficial frostbite of right ankle, initial encounter
- T33.811D Superficial frostbite of right ankle, subsequent encounter
- T33.811S Superficial frostbite of right ankle, sequela
- T33.812 Superficial frostbite of left ankleNon-billable
- T33.812A Superficial frostbite of left ankle, initial encounter
- T33.812D Superficial frostbite of left ankle, subsequent encounter
- T33.812S Superficial frostbite of left ankle, sequela
- T33.819 Superficial frostbite of unspecified ankleNon-billable
- T33.819A Superficial frostbite of unspecified ankle, initial encounter
- T33.819D Superficial frostbite of unspecified ankle, subsequent encounter
- T33.819S Superficial frostbite of unspecified ankle, sequela
- T33.82 Superficial frostbite of footNon-billable
- T33.821 Superficial frostbite of right footNon-billable
- T33.821A Superficial frostbite of right foot, initial encounter
- T33.821D Superficial frostbite of right foot, subsequent encounter
- T33.821S Superficial frostbite of right foot, sequela
- T33.822 Superficial frostbite of left footNon-billable
- T33.822A Superficial frostbite of left foot, initial encounter
- T33.822D Superficial frostbite of left foot, subsequent encounter
- T33.822S Superficial frostbite of left foot, sequela
- T33.829 Superficial frostbite of unspecified footNon-billable
- T33.829A Superficial frostbite of unspecified foot, initial encounter
- T33.829D Superficial frostbite of unspecified foot, subsequent encounter
- T33.829S Superficial frostbite of unspecified foot, sequela
- T33.83 Superficial frostbite of toe(s)Non-billable
- T33.831 Superficial frostbite of right toe(s)Non-billable
- T33.831A Superficial frostbite of right toe(s), initial encounter
- T33.831D Superficial frostbite of right toe(s), subsequent encounter
- T33.831S Superficial frostbite of right toe(s), sequela
- T33.832 Superficial frostbite of left toe(s)Non-billable
- T33.832A Superficial frostbite of left toe(s), initial encounter
- T33.832D Superficial frostbite of left toe(s), subsequent encounter
- T33.832S Superficial frostbite of left toe(s), sequela
- T33.839 Superficial frostbite of unspecified toe(s)Non-billable
- T33.839A Superficial frostbite of unspecified toe(s), initial encounter
- T33.839D Superficial frostbite of unspecified toe(s), subsequent encounter
- T33.839S Superficial frostbite of unspecified toe(s), sequela
- T33.9 Superficial frostbite of other and unspecified sitesNon-billable
- T33.90 Superficial frostbite of unspecified sitesNon-billable
- T33.90XA Superficial frostbite of unspecified sites, initial encounter
- T33.90XD Superficial frostbite of unspecified sites, subsequent encounter
- T33.90XS Superficial frostbite of unspecified sites, sequela
- T33.99 Superficial frostbite of other sitesNon-billable
- T33.99XA Superficial frostbite of other sites, initial encounter
- T33.99XD Superficial frostbite of other sites, subsequent encounter
- T33.99XS Superficial frostbite of other sites, sequela
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the T33 range.
Frostbite
Damage to tissues as the result of low environmental temperatures.
About the T33 Code Range
The ICD-10 code T33 and its subcodes specifically classify cases of superficial frostbite, which is a cold-related injury affecting the skin's outer layers. These codes identify superficial frostbite on various body parts such as the head, ears, nose, arms, hands, fingers, legs, feet, and other sites.
The code set under T33 allows detailed coding based on the exact body location affected, including distinctions between right and left sides. It also covers different stages of care encounters—initial, subsequent, and sequela—to track patient treatment progress. For example, T33.521A denotes an initial encounter for superficial frostbite of the right hand. This range aids medical coders in choosing the precise code for conditions often referred to as "frostbite of hand," "frostbite of toe," or "cold burn," ensuring accurate documentation. These codes are essential for capturing the extent of superficial frostbite injuries, supporting clinical decision-making and health records.
Questions About This Page
How many billable codes are in the T33 range?
Of the 163 codes in this range, 111 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the T33 range classify?
The range classifies superficial frostbite. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
All ICD-10-CM ChaptersAll of Chapter 19ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
