2026 ICD-10-CM Diagnosis Code T79.4XXATraumatic shock, initial encounter

ICD-10-CM Codes›S00–T88›T79›T79

ICD-10-CM T79.4XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T79.4XXA is a billable ICD-10-CM diagnosis code for traumatic shock, 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, 963 through 965. Coders also document this condition as burn shock. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified injury.

Code Identity

ICD-10-CM Code
T79.4XXA
Billable Status
Yes — Valid for Submission
Code Describes
Traumatic shock, initial encounter
Short Description
Traumatic shock, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T79.4
Traumatic shock

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT79Certain early complications of trauma
CategoryT79Certain early complications of trauma, not elsewhere classified
This CodeT79.4XXATraumatic shock, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Burn shock
  • Traumatic shock

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Certain early complications of trauma, not elsewhere classified (T79). 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 INJ026
Other specified injury
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Traumatic Shock

    any shock produced by trauma.

Patient EducationClinical

Shock

Shock happens when not enough blood and oxygen can get to your organs and tissues. It causes very low blood pressure and may be life-threatening. It often happens along with a serious injury.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert T79.4XXA to ICD-9-CMHistory

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

ICD-9-CM
958.4 Traumatic shock
Approximate The match is approximate rather than exact.

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 T79.4XXAOverview

Is T79.4XXA (Traumatic shock) a billable code?

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

What does the 7th character A in T79.4XXA mean?

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

What MS-DRG does T79.4XXA group to?

When traumatic shock, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 922, 923, 963, 964, 965, with relative weights from 0.9405 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T79.4XXA?

Under the General Equivalence Mappings, traumatic shock, initial encounter converts to ICD-9-CM 958.4 (traumatic shock). 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.