T33.70 – Superficial frostbite of unspecified knee and lower leg

ICD-10-CM 2027 diagnosis code · Frostbite

Non-billable header

ICD-10-CM code T33.70

Code: T33.70 (claims format: T3370)
Description: Superficial frostbite of unspecified knee and lower leg
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
Parent codes: T33 › T33.7

Billable codes under T33.70

T33.70 is a header code and cannot be used on claims. Choose the most specific code:

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 inherited from parent codes

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

T33 – Superficial frostbite

Includes:

frostbite with partial thickness skin loss

7th character note:

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

T33.7 – Superficial frostbite of knee and lower leg

Excludes2 (not included here):

superficial frostbite of ankle and foot (T33.8-)

Block T33-T34

Excludes2 (not included here):

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

Related codes in T33.7

Frequently asked questions

What is ICD-10 code T33.70?

T33.70 is the ICD-10-CM code for superficial frostbite of unspecified knee and lower leg, in the block T33-T34 (Frostbite).

Is T33.70 a billable code?

No. T33.70 is a header code with more specific child codes; report one of the billable codes listed above.

What category does T33.70 belong to?

It belongs to category T33 – Superficial frostbite.

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.