Quick answers
- Which hospitals does Calvin K. Lei work at?
- Medicare's official clinician data lists Calvin K. Lei at 2 hospitals: Stanford Health Care and Stanford Health Care Tri-Valley. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Calvin K. Lei see patients?
- Medicare's clinician data lists 3 practice locations, including Menlo Park, CA and Pleasanton, CA. Call before your visit to confirm the address.
- What is Calvin K. Lei's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Calvin K. Lei accept Medicare assignment?
- Yes. Medicare's clinician data says Calvin K. Lei 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 Calvin K. Lei offer telehealth?
- Medicare's clinician data says Calvin K. Lei offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Calvin K. Lei?
- (650) 498-6500, as listed in official Medicare / NPI Registry data.
- What is Calvin K. Lei's NPI number?
- 1265432967. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Calvin K. Lei works
Medicare's Facility Affiliation Data lists Calvin K. Lei 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
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · CCN 050283
Practice locations
Addresses where Calvin K. Lei is enrolled with Medicare (CMS data updated 2026-10-02).
- 1300 Crane StMenlo Park, CA 94025 (650) 498‑6500
- 4725 1st St, Suite 100Pleasanton, CA 94566 (925) 462‑7060
- 5568 Gibraltar DrPleasanton, CA 94588 (888) 924‑1036
Group practices
Medicare enrollment lists Calvin K. Lei as a member of this group (CMS data updated 2026-10-02).
- University Healthcare Alliance327 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Menlo Park
Clinicians with the same Medicare primary specialty in Menlo Park, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1265432967 |
| 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