2026 ICD-10-CM Diagnosis Code T75.09XAOther effects of lightning, initial encounter
T75.09XA is a billable ICD-10-CM diagnosis code for other effects of lightning, 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 arborescent patterning of skin. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Effect of other external causes, initial encounter; External cause codes: intent of injury, accidental/unintentional; and External cause codes: natural/environment; initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Arborescent patterning of skin
- Effects of lightning
- Exposure to electric current, with passage of current through tissue
- Exposure to lightning, with passage of current through tissue
- Eye injury from lightning
- Neurological injury from lightning
- Thermal burns from lightning
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.
Patient EducationClinical
Electrical Injuries
When you come in direct contact with electricity, it can pass through your body and cause injuries. These electrical injuries can be external or internal. You may have one or both types. External injuries are skin burns. Internal injuries include damage to your organs, bones, muscles, and nerves.
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Convert T75.09XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T75.09XAOverview
Is T75.09XA (Other effects of lightning) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other effects of lightning, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T75.09XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for other effects of lightning, such as an emergency visit or first evaluation.
What MS-DRG does T75.09XA group to?
When other effects of lightning, 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 T75.09XA?
Under the General Equivalence Mappings, other effects of lightning, initial encounter converts to ICD-9-CM 994.0 (effects of lightning). 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.
