2027 ICD-10-CM Diagnosis Code T73.2XXAExhaustion due to exposure, initial encounter

ICD-10-CM Codes›S00–T88›T66-T78›T73

ICD-10-CM T73.2XXA
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

T73.2XXA is a billable ICD-10-CM diagnosis code for exhaustion due to exposure, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 922 through 923. Coders also document this condition as exhaustion - physiological. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, initial encounter; External cause codes: intent of injury, accidental/unintentional; and External cause codes: natural/environment; initial encounter.

Code Identity

ICD-10-CM Code
T73.2XXA
Billable Status
Yes — Valid for Submission
Code Describes
Exhaustion due to exposure, initial encounter
Short Description
Exhaustion due to exposure, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T73.2
Exhaustion due to exposure

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT66-T78Other and unspecified effects of external causes
CategoryT73Effects of other deprivation
This CodeT73.2XXAExhaustion due to exposure, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Exhaustion - physiological
  • Exhaustion due to exposure

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Effects of other deprivation (T73). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027, published by CMS and the National Center for Health Statistics.

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to T73.2XXA: its own notes plus those printed at T73, block T66-T78, and Chapter 19. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • code to identify any retained foreign body, if applicable (Z18.-)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block T66-T78 Other and unspecified effects of external causes applies to 456 codes
  • 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-)

Notes

General instructions on how these codes are used.

From Chapter 19 (S00-T88) Injury, poisoning and certain other consequences of external causes applies to 41,187 codes
  • 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.

7th Character

Every code in the category takes a 7th character from the listed values, with the placeholder X filling any empty positions before it.

From T73 Effects of other deprivation applies to 18 codes
  • The appropriate 7th character is to be added to each code from category T73
Values for category T73 Encounter: Initial, Subsequent, Sequela
  • Ainitial encounter this code
  • Dsubsequent encounter
  • Ssequela

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name T73.2XXA, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming T73.2XXA: they are not reported together with it, unless the two conditions are unrelated.

  • R53.8 Other malaise and fatigue
    exhaustion and fatigue due to exposure (T73.2) names T73.2, which includes this code

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ021
Effect of other external causes, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR EXT020
External cause codes: intent of injury, accidental/unintentional
Default principal diagnosis: inpatient No · outpatient No
CCSR EXT011
External cause codes: natural/environment; initial encounter
Default principal diagnosis: inpatient No · outpatient No

Convert T73.2XXA to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
994.4 Exhaustion-exposure
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
E904.3 Exposure NEC
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About T73.2XXAOverview

What is the ICD-10 code for exhaustion due to exposure, initial encounter?

The ICD-10-CM code for exhaustion due to exposure, initial encounter is T73.2XXA (sometimes written as T732XXA). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is T73.2XXA (Exhaustion due to exposure) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report exhaustion due to exposure, initial encounter on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What does the 7th character A in T73.2XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for exhaustion due to exposure, such as an emergency visit or first evaluation.

What MS-DRG does T73.2XXA group to?

When exhaustion due to exposure, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 923, 922, with relative weights from 0.9980 to 1.6248 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T73.2XXA?

Under the General Equivalence Mappings, exhaustion due to exposure, initial encounter converts to ICD-9-CM 994.4 (exhaustion-exposure) and E904.3 (exposure NEC). The mapping is approximate, so confirm the match fits the documentation.