Alphabetic Index FY2027

T34.522D

Frostbite with tissue necrosis of left hand, subsequent encounter

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/T33–T34 Frostbite

BillableComplete code, valid to report
Care settingsHome Health Primary · MMTA - Other

T34.522D (also written T34522D) is a billable ICD-10-CM diagnosis code for frostbite with tissue necrosis of left hand, subsequent encounter. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 111 codes in category T34 (Frostbite with tissue necrosis). Its 7th character, D, means subsequent encounter. Its coding notes include a Use additional code instruction and 4 Excludes2 entries.

7th character

Category T34 requires a 7th character.

Assembled code T34.522D Open code

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.

Guidelines I.C.19.aInjuries: application of 7th charactersRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • code to identify any retained foreign body, if applicable (Z18.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from T34.52 Frostbite with tissue necrosis of hand
  • frostbite with tissue necrosis of finger(s) (T34.53-)
Also from chapter/block level (3 notes)
Inherited from T33–T34 Frostbite
  • hypothermia and other effects of reduced temperature (T68, T69.-)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

Notes

Also from chapter/block level (2 notes)
Inherited from Chapter 19 Injury, poisoning and certain other consequences of external causes
  • 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.