Yes, Medicare Part B can cover an EEG for an Alzheimer's evaluation when a doctor orders it as medically necessary. An EEG is a test that records the brain's electrical activity, but coverage is not routine and depends on the reason for the test. Alzheimer's evaluation usually relies on other tools first. Families often ask about EEG because brain testing feels decisive.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Official resources:
- Read the original research from NIH — Use this page to review the original research.
- Read the official guidance from Medicare — Use this primary source to verify the official guidance.
Table of Contents
- What does Medicare usually cover for dementia testing?
- Why isn't EEG a routine Alzheimer's test?
- When might an EEG still be useful?
- What to check before you schedule an EEG?
What does Medicare usually cover for dementia testing?
Medicare Part B covers diagnostic tests that help find or treat a medical problem. That group includes CT, MRI, X-ray and PET scans often used in dementia workups, according to the Centers for Medicare & Medicaid Services diagnostic test coverage page.
Coverage applies only when a provider orders the test for a medical reason. Medicare Part B also covers a separate cognitive assessment visit, according to the Centers for Medicare & Medicaid Services cognitive assessment coverage page. That visit reviews memory and thinking, confirms dementia or Alzheimer's disease, builds a care plan and adds specialist referrals when needed.
Why isn't EEG a routine Alzheimer's test?
There is no single test that determines Alzheimer's disease, according to the Alzheimer's Association medical tests information. Doctors combine history, neurologic and cognitive exams, brain imaging with MRI, CT and PET, plus spinal-fluid or blood tests.
A 2005 Drexel University College of Medicine study found EEG is generally not sensitive for detecting dementia. It is not recommended in the standard dementia workup, which limits its role as a routine Alzheimer's test.
When might an EEG still be useful?
In suspected dementia with worsening mental status, EEG can help rule out other causes. The Drexel researchers list delirium, depression, atypical complex partial seizures and prion disease such as Creutzfeldt-Jakob disease.
Some Medicare policies treat quantitative EEG brain mapping as medically necessary when diagnosis stays unclear after initial evaluation. That category includes evaluation of dementia such as Alzheimer's or Parkinson's-related dementia, under a Dean Health Plan policy effective in 2024.
What to check before you schedule an EEG?
You need a doctor's order that states the medical reason for the test. Medicare guidance and a Medicare.org explainer stress confirming medical necessity, assignment and accreditation to avoid denial or extra bills.
In a doctor's office or independent facility, beneficiaries pay 20 percent of the approved amount after meeting the Part B deductible. Hospital outpatient copayments are capped, according to the Centers for Medicare & Medicaid Services. Ask the office if the doctor accepts Medicare assignment before you book.
- Ask why EEG is needed and what other causes it will rule out.
- Ask if the office accepts Medicare assignment.
- Ask if the facility and reader meet accreditation rules.
