Quick answers
- Which hospitals does Benjamin D. Longwell work at?
- Medicare's official clinician data lists Benjamin D. Longwell at 2 hospitals: John Muir Medical Center - Concord Campus and John Muir Medical Center - Walnut Creek Campus. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Benjamin D. Longwell see patients?
- Medicare's clinician data lists 3 practice locations, including Walnut Creek, CA, Fremont, CA and Concord, CA. Call before your visit to confirm the address.
- What is Benjamin D. Longwell's specialty?
- Medicare lists Anesthesiology as the primary specialty.
- Does Benjamin D. Longwell accept Medicare assignment?
- Yes. Medicare's clinician data says Benjamin D. Longwell 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 Benjamin D. Longwell?
- (925) 939-3000, as listed in official Medicare / NPI Registry data.
- What is Benjamin D. Longwell's NPI number?
- 1548623671. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Benjamin D. Longwell works
Medicare's Facility Affiliation Data lists Benjamin D. Longwell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
Practice locations
Addresses where Benjamin D. Longwell is enrolled with Medicare (CMS data updated 2026-10-02).
- 1601 Ygnacio Valley RdWalnut Creek, CA 94598 (925) 939‑3000
- 2000 Mowry AveFremont, CA 94538 (510) 797‑1111
- 2540 E StConcord, CA 94520 (925) 682‑8200
Group practices
Medicare enrollment lists Benjamin D. Longwell as a member of this group (CMS data updated 2026-10-02).
- Cep America - Anesthesia PC849 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Philadelphia College Of Osteopathic Medicine |
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1548623671 |
| 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