Physician Profile
Unclaimed ProfileAbout Dr. Marshall
Based in Boston, MA, Gad A Marshall, MD is listed in the NPI registry under neurology. Gad graduated from Boston University School of Medicine in 2000. Medicare claims data shows Gad provided 141 services to 70 patients.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (617) 732-8085
- Email not available
Practice Locations
BWH MEMORY DISORDER UNIT 221 LONGWOOD AVE
Boston, MA 02115
Conditions Commonly Evaluated or Treated
Within Neurology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Headache and facial pain
- Chronic migraine
- Cluster headache
- Medication-overuse headache
- Migraine
- Migraine with aura
- Tension headaches
- Trigeminal neuralgia
Memory and cognition
- Alzheimer's disease
- Dementia with Lewy bodies
- Frontotemporal dementia
- Mild cognitive impairment
- Primary progressive aphasia
- Vascular dementia
Movement disorders
- Ataxia
- Dystonia
- Essential tremor
- Huntington's disease
- Parkinson's disease
- Restless legs syndrome
- Tourette syndrome
Neuroimmunology
Neuromuscular and peripheral nerve
- Amyotrophic lateral sclerosis
- Carpal tunnel syndrome
- Chronic inflammatory demyelinating polyneuropathy
- Diabetic neuropathy
- Guillain-Barré syndrome
- Inflammatory myopathy
- Muscular dystrophy
- Myasthenia gravis
- Peripheral neuropathy
- Radiculopathy
Seizures and epilepsy
- Epilepsy and seizure disorders
- Focal epilepsy
- Functional seizures
- Generalized epilepsy
- Status epilepticus
Stroke and vascular
- Brain aneurysm
- Cerebral small-vessel disease
- Hemorrhagic stroke
- Ischemic stroke
- Transient ischemic attack
Spine, brain injury, and functional
- Bell's palsy
- Concussion
- Functional neurological disorder
- Spinal cord disorders
- Traumatic brain injury
Procedures & services
Consultation and testing
- Ambulatory EEG
- Cognitive and memory testing
- Comprehensive neurologic examination
- Electroencephalogram
- Electromyography
- Evoked-potential testing
- Inpatient video EEG monitoring
- Nerve-conduction studies
Treatment management
- Epilepsy medication management
- Migraine preventive treatment
- Multiple sclerosis disease-modifying treatment
- Neurologic infusion treatment
Office procedures
Procedures Most Often Billed to Medicare
141 services · 70 patients · 3 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or | Billing code | G2212 |
67 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
59 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
15 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other neurology specialists in Boston 8
Same specialty, same city.
Trained at Boston University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 2000 at Boston University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. Marshall specialize in?
Dr. Marshall is a neurology in Boston, MA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “NEUROLOGY”.
NPI registry
Where is Dr. Marshall located?
Dr. Marshall is listed at BWH MEMORY DISORDER UNIT 221 LONGWOOD AVE, Boston, MA 02115. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Marshall's phone number?
The number on file is (617) 732-8085. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. Marshall?
Dr. Marshall's National Provider Identifier is 1639105513. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Marshall go to medical school?
Dr. Marshall attended Boston University School of Medicine, graduating in 2000. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Marshall have?
Dr. Marshall has 26 years experience. Calculated from a graduation year of 2000, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Marshall do most often?
According to Medicare billing data, Dr. Marshall the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Marshall's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Marshall. If this is you, claiming it is free.
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Claim this profileProvider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.