Quick answers
- Which hospitals does William Graff work at?
- Medicare's official clinician data lists William Graff at 5 hospitals: Catholic Medical Center, Elliot Hospital, Mary Hitchcock Memorial Hospital, Parkland Medical Center and Portsmouth Regional Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Graff see patients?
- Medicare's clinician data lists 2 practice locations, including Derry, NH. Call before your visit to confirm the address.
- What is William Graff's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does William Graff accept Medicare assignment?
- Yes. Medicare's clinician data says William Graff accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for William Graff?
- (603) 432-1500, as listed in official Medicare / NPI Registry data.
- What is William Graff's NPI number?
- 1801872825. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Graff works
Medicare's Facility Affiliation Data lists William Graff at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Catholic Medical CenterManchester, NH · Acute Care Hospital · CCN 300034
- Elliot HospitalManchester, NH · Acute Care Hospital · CCN 300012
- Mary Hitchcock Memorial HospitalLebanon, NH · Acute Care Hospital · CCN 300003
- Parkland Medical CenterDerry, NH · Acute Care Hospital · CCN 300017
- Portsmouth Regional HospitalPortsmouth, NH · Acute Care Hospital · CCN 300029
Practice locations
Addresses where William Graff is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Parkland DrDerry, NH 03038 (603) 432‑1500
- 6 Tsienneto Rd, Suite 203Derry, NH 03038 (603) 434‑7444
Group practices
Medicare enrollment lists William Graff as a member of these groups (CMS data updated 2026-10-02).
- Parkland Physician Services Inc19 clinicians in the group
- HCA Health Services of New Hampshire Inc7 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in New Hampshire →
Other cardiologists in Derry
Clinicians with the same Medicare primary specialty in Derry, NH — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1801872825 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians