2026 ICD-10-CM Diagnosis Code T75.89XAOther specified effects of external causes, initial encounter
T75.89XA is a billable ICD-10-CM diagnosis code for other specified effects of external causes, 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
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bystander in sports activity accident
- Coach in sports activity accident
- Disorders of skin induced by physical agents
- Effect of exposure to external cause
- Effect of exposure to physical force
- Effects of accidental exposure to external cause
- Effects of exposure to extreme temperature
- Injury due to projectile
- Late effect of injury of unknown intent
- Myocarditis caused by physical agent
- Panniculitis due to physical factor
- Pathologic resorption of root of tooth
- Player in sports activity accident
- Resorption of alveolar process caused by orthodontic force
- Resorption of root of tooth caused by orthodontic force
- Victim of environmental event
- Victim of sports activities
- Victim of trauma
- War injuries due to fires and conflagrations
- War injury
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 T75.89XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replaced This code was replaced in the FY 2026 code set by:
- T75.830A - Gulf war illness, initial encounter
- T75.838A - Effects of other war theater, initial encounter
Questions About T75.89XAOverview
Is T75.89XA (Other specified effects of external causes) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified effects of external causes, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T75.89XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for other specified effects of external causes, such as an emergency visit or first evaluation.
What MS-DRG does T75.89XA group to?
When other specified effects of external causes, 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 T75.89XA?
Under the General Equivalence Mappings, other specified effects of external causes, 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.
