Dr. Benjamin L. Grannan, MD
Neurosurgery (Neurological Surgery Physician)
Who else practices at this address →
King County includes primary care (5% of residents) and dental (4% of residents) and mental health (4% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Harvard Medical School (2014)
- Years since graduation
- 12
- In the NPI registry since
- 2014
- Medicare patients seen, 2024
- 111
Licensed in Washington since 2021, according to the Washington State Department of Health. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2014Medical school: Harvard Medical School
- 2014Registered with an NPI (national billing number; not a license date)
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Neurological Surgery Physician primary
WA license MD61138194 (first issued 2021; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- University of Washington Medical Ctr Seattle, WA
- Harborview Medical Center Seattle, WA
Medical groups
- The Association of University Physicians (3,535 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 111
- Services billed
- 208
- Patients’ average age
- 69
| Service | Times | Patients |
|---|---|---|
| New patient office or other outpatient visit, 45-59 minutes | 26 | 26 |
| New patient office or other outpatient visit, 30-44 minutes | 22 | 22 |
| Established patient office or other outpatient visit, 30-39 minutes | 17 | 16 |
| Telephone, internet, or electronic health record assessment and management with written report by consulting physician, at least 5 minutes | 17 | 17 |
| Computer-assisted procedure inside brain | 11 | 11 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Payments from drug and device companies
In 2025, 2 companies reported 19 payments worth $1,455 in total to this clinician.
| Medtronic, Inc. | $1,349 |
|---|---|
| Boston Scientific Corporation | $106 |
| Travel and Lodging | $991 |
|---|---|
| Food and Beverage | $463 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Medtronic, Inc. Jul 30, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $332 |
| Medtronic, Inc. Aug 21, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $199 |
| Medtronic, Inc. Jul 30, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $198 |
| Medtronic, Inc. Sep 22, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $163 |
| Medtronic, Inc. Jul 30, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $35.07 |
| Medtronic, Inc. Jul 30, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $35.07 |
| Medtronic, Inc. Aug 21, 2025 | Travel and Lodging ACTIVA PC · Deep Brain Neurostimulation · travel to Minneapolis, MN · in-kind | $29.90 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.