2026 ICD-10-CM Diagnosis Code T73.9XXAEffect of deprivation, unspecified, initial encounter

ICD-10-CM Codes›S00–T88›T66-T78›T73

ICD-10-CM T73.9XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T73.9XXA is a billable ICD-10-CM diagnosis code for effect of deprivation, unspecified, 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 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 922 through 923. 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
T73.9XXA
Billable Status
Yes — Valid for Submission
Code Describes
Effect of deprivation, unspecified, initial encounter
Short Description
Effect of deprivation, unspecified, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T73.9
Effect of deprivation, unspecified

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 CodeT73.9XXAEffect of deprivation, unspecified, initial encounter

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 2026, published by CMS and the National Center for Health Statistics.

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 T73.9XXA to ICD-9-CMHistory

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

ICD-9-CM
994.9 Effect external caus NEC
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
E904.9 Privation NOS
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T73.9XXAOverview

Is T73.9XXA (Effect of deprivation, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report effect of deprivation, unspecified, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T73.9XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for effect of deprivation, unspecified, such as an emergency visit or first evaluation.

What MS-DRG does T73.9XXA group to?

When effect of deprivation, unspecified, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, with relative weights from 1.0177 to 1.7494 depending on complications. Higher weights mean higher Medicare reimbursement.

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

Under the General Equivalence Mappings, effect of deprivation, unspecified, initial encounter converts to ICD-9-CM 994.9 (effect external caus NEC) and E904.9 (privation NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.