2026 ICD-10-CM Diagnosis Code T70.4XXAEffects of high-pressure fluids, initial encounter

ICD-10-CM Codes›S00–T88›T66-T78›T70

ICD-10-CM T70.4XXA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T70.4XXA is a billable ICD-10-CM diagnosis code for effects of high-pressure fluids, 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 effects of high-pressure fluids. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, initial encounter.

Code Identity

ICD-10-CM Code
T70.4XXA
Billable Status
Yes — Valid for Submission
Code Describes
Effects of high-pressure fluids, initial encounter
Short Description
Effects of high-pressure fluids, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T70.4
Effects of high-pressure fluids

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT66-T78Other and unspecified effects of external causes
CategoryT70Effects of air pressure and water pressure
This CodeT70.4XXAEffects of high-pressure fluids, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Effects of high-pressure fluids

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Effects of air pressure and water pressure (T70). 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

Convert T70.4XXA to ICD-9-CMHistory

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

ICD-9-CM
993.4 Eff air press by explos
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 T70.4XXAOverview

Is T70.4XXA (Effects of high-pressure fluids) a billable code?

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

What does the 7th character A in T70.4XXA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for effects of high-pressure fluids, such as an emergency visit or first evaluation.

What MS-DRG does T70.4XXA group to?

When effects of high-pressure fluids, 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 T70.4XXA?

Under the General Equivalence Mappings, effects of high-pressure fluids, initial encounter converts to ICD-9-CM 993.4 (eff air press by explos). 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.