Quick answers
- Which hospitals does Cathy L. Riker work at?
- Medicare's official clinician data lists Cathy L. Riker at 1 hospital: Stanford Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Cathy L. Riker see patients?
- Medicare's clinician data lists 1 practice location in Menlo Park, CA. Call before your visit to confirm the address.
- What is Cathy L. Riker's specialty?
- Medicare lists Rheumatology as the primary specialty, and also Internal Medicine.
- Does Cathy L. Riker accept Medicare assignment?
- Yes. Medicare's clinician data says Cathy L. Riker 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 Cathy L. Riker offer telehealth?
- Medicare's clinician data says Cathy L. Riker offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Cathy L. Riker?
- (650) 498-6500, as listed in official Medicare / NPI Registry data.
- What is Cathy L. Riker's NPI number?
- 1255448189. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Cathy L. Riker works
Medicare's Facility Affiliation Data lists Cathy L. Riker 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 Cathy L. Riker is enrolled with Medicare (CMS data updated 2026-10-02).
- 1300 Crane StMenlo Park, CA 94025 (650) 498‑6500
Group practices
Medicare enrollment lists Cathy L. Riker as a member of this group (CMS data updated 2026-10-02).
- University Healthcare Alliance327 clinicians in the group
Specialties
- Rheumatologyprimary
- Internal Medicinealso
Other rheumatologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Icahn School Of Medicine At Mount Sinai |
| Graduation year | 1986 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1255448189 |
| 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