Quick answers
- Which hospitals does James W. Maas work at?
- Medicare's official clinician data lists James W. Maas at 2 hospitals: Alta Bates Summit Medical Center - Alta Bates Camp… and UCSF Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James W. Maas see patients?
- Medicare's clinician data lists 1 practice location in San Francisco, CA. Call before your visit to confirm the address.
- What is James W. Maas's specialty?
- Medicare lists Neurology as the primary specialty.
- Does James W. Maas accept Medicare assignment?
- Yes. Medicare's clinician data says James W. Maas 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.
- Does James W. Maas offer telehealth?
- Medicare's clinician data says James W. Maas offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for James W. Maas?
- (415) 476-4029, as listed in official Medicare / NPI Registry data.
- What is James W. Maas's NPI number?
- 1255506788. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James W. Maas works
Medicare's Facility Affiliation Data lists James W. Maas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Alta Bates Summit Medical Center - Alta Bates Camp…Berkeley, CA · Acute Care Hospital · CCN 050305
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · CCN 050454
Practice locations
Addresses where James W. Maas is enrolled with Medicare (CMS data updated 2026-10-02).
- 2330 Post StSan Francisco, CA 94115 (415) 476‑4029
Group practices
Medicare enrollment lists James W. Maas as a member of this group (CMS data updated 2026-10-02).
- University of California San Francisco1,839 clinicians in the group
Specialties
- Neurologyprimary
Other neurologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Clinician information
| Medical school | Washington University School Of Medicine |
|---|---|
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1255506788 |
| 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