Quick answers
- Which hospitals does William H. Longfellow work at?
- Medicare's official clinician data lists William H. Longfellow at 1 hospital: Sharp Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William H. Longfellow see patients?
- Medicare's clinician data lists 1 practice location in San Diego, CA. Call before your visit to confirm the address.
- What is William H. Longfellow's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does William H. Longfellow accept Medicare assignment?
- Yes. Medicare's clinician data says William H. Longfellow 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 H. Longfellow?
- (858) 939-3400, as listed in official Medicare / NPI Registry data.
- What is William H. Longfellow's NPI number?
- 1669886545. 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 H. Longfellow works
Medicare's Facility Affiliation Data lists William H. Longfellow at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sharp Memorial HospitalSan Diego, CA · Acute Care Hospital · CCN 050100
Practice locations
Addresses where William H. Longfellow is enrolled with Medicare (CMS data updated 2026-10-02).
- 7901 Frost StSan Diego, CA 92123 (858) 939‑3400
Group practices
Medicare enrollment lists William H. Longfellow as a member of these groups (CMS data updated 2026-10-02).
- Emergency and Acute Care Medical Corporation422 clinicians in the group
- Focus on Health Inc64 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669886545 |
| 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