2026 ICD-10-CM Diagnosis Code T67.09XAOther heatstroke and sunstroke, initial encounter

ICD-10-CM Codes›S00–T88›T66-T78›T67

ICD-10-CM T67.09XA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T67.09XA is a billable ICD-10-CM diagnosis code for other heatstroke and sunstroke, 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.

Code Identity

ICD-10-CM Code
T67.09XA
Billable Status
Yes — Valid for Submission
Code Describes
Other heatstroke and sunstroke, initial encounter
Short Description
Other heatstroke and sunstroke, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T67.09
Other heatstroke and sunstroke

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT66-T78Other and unspecified effects of external causes
CategoryT67Effects of heat and light
This CodeT67.09XAOther heatstroke and sunstroke, initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Effects of heat and light (T67). 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

Patient EducationClinical

Heat Illness

Your body normally cools itself by sweating. During hot weather, especially when it is very humid, sweating just isn't enough to cool you off. Your body temperature can rise to dangerous levels and you can develop a heat illness.

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement T67.09XA replaces the following previously assigned code(s):

  • T67.0XXA - Heatstroke and sunstroke, initial encounter
FY 2020AddedAdded to the ICD-10-CM code setEffective October 1, 2019.
FY 2021–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T67.09XAOverview

Is T67.09XA (Other heatstroke and sunstroke) a billable code?

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

What does the 7th character A in T67.09XA mean?

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

What MS-DRG does T67.09XA group to?

When other heatstroke and sunstroke, 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.

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.