2026 ICD-10-CM Diagnosis Code T75.81XAEffects of abnormal gravitation [G] forces, initial encounter
T75.81XA is a billable ICD-10-CM diagnosis code for effects of abnormal gravitation [G] forces, 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 abnormal gravitational forces AND/OR states. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Effects of abnormal gravitational forces AND/OR states
- Effects of centrifugal force
- Injury caused by abnormal gravitational state
- Syncope caused by centrifugal force in flying
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Other and unspecified effects of other external causes (T75). 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.
Convert T75.81XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T75.81XAOverview
Is T75.81XA (Effects of abnormal gravitation [G] forces) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report effects of abnormal gravitation [G] forces, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T75.81XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for effects of abnormal gravitation [G] forces, such as an emergency visit or first evaluation.
What MS-DRG does T75.81XA group to?
When effects of abnormal gravitation [G] forces, 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 T75.81XA?
Under the General Equivalence Mappings, effects of abnormal gravitation [G] forces, initial encounter converts to ICD-9-CM 994.9 (effect external caus NEC). 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.
