Summary & Overview
HCPCS G0046: Clinical Follow-Up After Endovascular Stroke Intervention, mRS Not Assessed at 90 Days
HCPCS Level II code G0046 denotes a post-procedure clinical follow-up visit when the modified Rankin Scale (mRS) score was not assessed at 90 days following an endovascular stroke intervention. This code documents a specific gap in standardized functional outcome measurement after mechanical thrombectomy or similar endovascular therapies and is important for tracking longitudinal care and quality reporting. Nationally, consistent use of this code can highlight follow-up adherence and areas for process improvement in stroke care pathways.
Key payers referenced include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code’s clinical context, the typical services and sites where it is billed, and what to expect in payer coverage discussions. The publication also outlines common modifiers and practical billing considerations, plus where to look for related codes and documentation best practices.
This summary provides national-level context for clinicians, billing professionals, and policy analysts seeking to understand how post-endovascular stroke follow-up is captured in claims data, how the absence of a 90-day mRS assessment is billed, and the implications for quality measurement and post-acute care coordination.
Billing Code Overview
HCPCS Level II code G0046 represents a clinical follow-up visit and modified Rankin Scale (mRS) score not assessed at 90 days after an endovascular stroke intervention. The code captures the clinical encounter intended to document follow-up care specifically addressing the 90-day post-procedure period when the mRS score has not been assessed.
Service Type: Post-procedure clinical follow-up
Typical Site of Service: Outpatient clinic or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A 68-year-old male with atrial fibrillation presents with an acute ischemic stroke due to a large vessel occlusion of the left middle cerebral artery. He undergoes endovascular mechanical thrombectomy in an interventional neuroradiology suite, with successful recanalization achieved. The patient is admitted to a neurocritical care unit for post-procedure monitoring and secondary prevention. At hospital discharge, plans are made for outpatient follow-up. Ninety days after the endovascular stroke intervention the treating team attempts to document the modified Rankin Scale (mRS) and complete a structured clinical follow-up visit to assess functional outcome, but the mRS score is not assessed or documented (for example, the patient is lost to follow-up, unable to be reached, or the visit occurred without mRS documentation).
Typical workflow elements include pre-procedure imaging and consent, the endovascular intervention in an angiography suite, inpatient acute care and rehabilitation coordination, scheduling of the 90-day outcome follow-up, and efforts by clinical staff to contact the patient or caregiver for outcome assessment. The billing code G0046 is used to indicate that the 90-day clinical follow-up and mRS score assessment following an endovascular stroke intervention were not completed or not assessed as required.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services |