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v1.0.0
ICD-10 Guide
DiagnosesTransient Ischaemic Attack

Transient Ischaemic Attack

ICD-10 Coding for Transient Ischaemic Attack(G45.9, G45.0)

PRIMARY SPECIALTYEmergency Medicine
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Transient Ischaemic Attack?
Essential facts and insights about Transient Ischaemic Attack

Key Clinical Considerations:

  • Sudden onset of neurological deficits lasting less than 24 hours
  • Transient weakness or numbness, especially on one side of the body
  • Speech difficulties or confusion
  • Key diagnostic tests include CT or MRI to rule out stroke
  • Physical exam findings may include unilateral weakness, facial droop, or aphasia

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document onset time of symptoms and resolution
  • Use specific terms like 'transient ischemic attack' or 'TIA'
  • Examples include detailed descriptions of neurological deficits and patient history

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines emphasize the importance of symptom duration and resolution.
  • Common errors include misclassifying TIA as a stroke or failing to document symptom resolution.

Code Exclusions

Important Exclusions

  • Excluded conditions include full stroke (ICD codes I63, I64).
  • Alternative codes may include those for specific causes of TIA, such as carotid artery stenosis.

Related ICD-10 Codes

Primary Codes
G45.9
Transient cerebral ischemic attack, unspecified
G45.0
Transient ischemic attack, amaurosis fugax
Ancillary Codes
Z86.73
Differential Codes
I63.x

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Emergency Medicine

Specialty Applications

  • Patient populations include those with risk factors for stroke, such as hypertension and diabetes.
  • Clinical settings include emergency departments and outpatient neurology clinics.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include detailed patient history, symptom duration, and neurological exam findings.

Billing considerations?

Ensure accurate coding to reflect the transient nature and exclude stroke codes.