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Dr. William S. Grigg, an internal medicine physician based in Franklin Square, NY, practices with Harbor Medical of New York PC.
Philadelphia College of Osteopathic Medicine is where Dr. Grigg went to medical school, graduating in 2018. The DO after his name stands for Doctor of Osteopathic Medicine — a fully licensed physician, trained with an extra emphasis on the musculoskeletal system.
The office is at 1230 Hempstead Tpke, Franklin Square, NY 11010; the phone number on record is (888) 432-8885. Dr. Grigg accepts Medicare assignment, which means he takes the Medicare-approved amount as full payment for covered services. He is listed as offering telehealth.
Have you been a patient of Dr. Grigg? A short, fair review — what went well, what didn't — helps the next person choosing an internal medicine physician in Franklin Square.
Dr. Grigg at a glance
- Specialty
- Internal medicine physician
- Credentials
- DO
- Practice
- Harbor Medical of New York PC
- Address
- 1230 Hempstead Tpke, Franklin Square, NY 11010
- Phone
- (888) 432-8885
- Medical school
- Philadelphia College of Osteopathic Medicine (2018)
- Medicare assignment
- Accepts
- Telehealth
- Available
- NPI number
- 1578050266
Medicare, Medicaid and hospitals
- Medicare patients (2024)
- 94 people with traditional Medicare, average age 76
- New York Medicaid
- Enrolled fee-for-service provider since 2026. Medicaid managed-care plans keep their own networks, so check with your plan.
Medicare figures cover people with traditional (fee-for-service) Medicare only; services billed for fewer than 11 patients are not published.
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Frequently Asked Questions
With Harbor Medical of New York PC, at 1230 Hempstead Tpke, Franklin Square, NY 11010.
Call the office at (888) 432-8885.
Yes — Dr. Grigg accepts Medicare assignment, taking the Medicare-approved amount as full payment for covered services.
Philadelphia College of Osteopathic Medicine, graduating in 2018.
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