2026 ICD-10-CM Diagnosis Code T67.4XXSHeat exhaustion due to salt depletion, sequela
T67.4XXS is a billable ICD-10-CM diagnosis code for heat exhaustion due to salt depletion, sequela. The 7th character S marks it as a sequela code, which reports a problem that remains after the original condition has resolved. 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. The code is exempt from POA reporting. Coders also document this condition as heat exhaustion. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, sequela.
Code Identity
Code Classification
Present on Admission (POA)Billing
T67.4XXS is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Heat exhaustion
- Heat exhaustion due to salt depletion
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.
Clinical InformationClinical
Heat Exhaustion
a clinical syndrome caused by heat stress, such as over-exertion in a hot environment or excessive exposure to sun. it is characterized by sweating, water (volume) depletion, salt depletion, cool clammy skin, nausea, and headache.
Patient EducationClinical
Fluid and Electrolyte Balance
Electrolytes are minerals that have an electric charge when they are dissolved in water or body fluids, including blood. The electric charge can be positive or negative. You have electrolytes in your blood, urine (pee), tissues, and other body fluids.
The full article covers:
- What are electrolytes?
- What are the different types of electrolytes in your body?
- What is an electrolyte imbalance?
- What are the different types of electrolyte imbalances?
- How are electrolyte imbalances diagnosed?
- What are the treatments for electrolyte imbalances?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T67.4XXS to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T67.4XXSOverview
Is T67.4XXS (Heat exhaustion due to salt depletion) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report heat exhaustion due to salt depletion, sequela on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character S in T67.4XXS mean?
The final character S makes this a sequela code: it reports a lingering problem that remains after the heat exhaustion due to salt depletion itself has resolved, not the original event.
What MS-DRG does T67.4XXS group to?
When heat exhaustion due to salt depletion, sequela 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.
Is T67.4XXS exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for heat exhaustion due to salt depletion, sequela on inpatient claims.
What is the ICD-9 equivalent of T67.4XXS?
Under the General Equivalence Mappings, heat exhaustion due to salt depletion, sequela converts to ICD-9-CM 909.4 (late eff cert ext cause). 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.
