Alphabetic Index FY2027

T73.2XXA

Exhaustion due to exposure, initial encounter

FY2027Chapter 19: Injury, poisoning and certain other consequences of external causes/T66–T78 Other and unspecified effects of external causes

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

T73.2XXA (also written T732XXA) is a billable ICD-10-CM diagnosis code for exhaustion due to exposure, initial encounter. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 18 codes in category T73 (Effects of other deprivation). The Alphabetic Index lists it under 3 entries. Its 7th character, A, means initial encounter. Its coding notes include a Use additional code instruction, a Code also instruction and 2 Excludes2 entries.

7th character

Category T73 requires a 7th character. T73.2 has only 4 characters, so a placeholder X fills the empty positions.

Assembled code T73.2XXA 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.-)

Code also

Two codes may be needed to describe the condition. This note gives no sequencing order.

Also from chapter/block level (6 notes)
Inherited from T66–T78 Other and unspecified effects of external causes
  • , if applicable, place of occurrence, such as:
    • highway rest stop (Y92.523)
    • school (private) (public) (state) as the place of occurrence of the external cause (Y92.21-)
    • service areas as the place of occurrence of the external cause (Y92.52-)
    • single-family non-institutional (private) house as the place of occurrence of the external cause (Y92.01-)
    • transport vehicle as the place of occurrence of the external cause (Y92.81-)

Excludes2

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

Also from chapter/block level (2 notes)
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.

Alphabetic Index terms

Terms the official Alphabetic Index lists for T73.2. This code adds the 7th character. 3 entries