T33 – Superficial frostbite

ICD-10-CM 2027 diagnosis code · Frostbite

Non-billable header

ICD-10-CM code T33

Code: T33 (claims format: T33)
Description: Superficial frostbite
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
Block: T33-T34 Frostbite

Billable codes under T33

T33 is a header code and cannot be used on claims. Choose the most specific code:

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

7th character values

Codes in this category need a 7th character to describe the encounter or episode of care (use placeholder X for empty positions).

Character	Meaning
`A`	initial encounter
`D`	subsequent encounter
`S`	sequela

Notes for T33

Includes:

frostbite with partial thickness skin loss

7th character note:

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

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block T33-T34

Excludes2 (not included here):

hypothermia and other effects of reduced temperature (T68, T69.-)

Frequently asked questions

What is ICD-10 code T33?

T33 is the ICD-10-CM code for superficial frostbite, in the block T33-T34 (Frostbite).

Is T33 a billable code?

No. T33 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.