Quick answers
- Which hospitals does Stephen P. Ma work at?
- Medicare's official clinician data lists Stephen P. Ma at 1 hospital: Stanford Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stephen P. Ma see patients?
- Medicare's clinician data lists 1 practice location in Stanford, CA. Call before your visit to confirm the address.
- What is Stephen P. Ma's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Stephen P. Ma accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen P. Ma 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 Stephen P. Ma?
- (650) 723-4000, as listed in official Medicare / NPI Registry data.
- What is Stephen P. Ma's NPI number?
- 1508329442. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stephen P. Ma works
Medicare's Facility Affiliation Data lists Stephen P. Ma at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Stanford Health CareStanford, CA · Acute Care Hospital · CCN 050441
Practice locations
Addresses where Stephen P. Ma is enrolled with Medicare (CMS data updated 2026-10-02).
- 300 Pasteur DrStanford, CA 94305 (650) 723‑4000
Group practices
Medicare enrollment lists Stephen P. Ma as a member of this group (CMS data updated 2026-10-02).
- Stanford Health Care3,122 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Stanford
Clinicians with the same Medicare primary specialty in Stanford, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508329442 |
| 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