2026 ICD-10-CM Diagnosis Code T67.7XXAHeat edema, initial encounter

ICD-10-CM Codes›S00–T88›T66-T78›T67

ICD-10-CM T67.7XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T67.7XXA is a billable ICD-10-CM diagnosis code for heat edema, 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. Coders also document this condition as heat edema. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, initial encounter.

Code Identity

ICD-10-CM Code
T67.7XXA
Billable Status
Yes — Valid for Submission
Code Describes
Heat edema, initial encounter
Short Description
Heat edema, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T67.7
Heat edema

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 CodeT67.7XXAHeat edema, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Heat edema

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

Edema

Edema means swelling caused by fluid in your body's tissues. It usually occurs in the feet, ankles and legs, but it can involve your entire body.

Read the full article at MedlinePlus

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

Convert T67.7XXA to ICD-9-CMHistory

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

ICD-9-CM
992.7 Heat edema
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 T67.7XXAOverview

Is T67.7XXA (Heat edema) a billable code?

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

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

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

What MS-DRG does T67.7XXA group to?

When heat edema, 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 T67.7XXA?

Under the General Equivalence Mappings, heat edema, initial encounter converts to ICD-9-CM 992.7 (heat edema). 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.