Quick answers
- Does Robin F. Mercer accept Medicare assignment?
- Yes. Medicare's clinician data says Robin F. Mercer accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Robin F. Mercer see?
- In 2024, CMS data shows 358 Original Medicare patients and 2,256 services for Robin F. Mercer. This counts Original Medicare only and measures volume, not quality.
- What is Robin F. Mercer's NPI number?
- 1346592227. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Robin F. Mercer, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 358 |
|---|---|
| Services billed to Medicare | 2,256 |
| Different services or procedures | 26 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)252 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)226 services
- Replacement of knee joint, both sides of knee (27447)109 services
- Replacement of thigh bone and hip joint with prosthesis (27130)91 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)80 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- Arthritis75%
- High blood pressure69%
- Anxiety22%
- Chronic kidney disease22%
- Osteoporosis22%
Hospitals where Robin F. Mercer works
Medicare's Facility Affiliation Data lists Robin F. Mercer at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050689
- Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283
- UCSF Health Hyde HospitalSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050152
Practice locations
Addresses where Robin F. Mercer is enrolled with Medicare (CMS data updated October 2, 2026).
- 300 Pasteur DrStanford, CA 94305 (650) 723‑4000
- 5555 W Las Positas BlvdPleasanton, CA 94588 (925) 847‑3000
- 5725 W Las Positas BlvdPleasanton, CA 94588
Group practices
Medicare enrollment lists Robin F. Mercer as a member of this group (CMS data updated October 2, 2026).
- Stanford Health Care3,122 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Stanford
Clinicians with the same Medicare primary specialty in Stanford, CA — not a recommendation.
Other clinicians in Stanford Health Care
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2012 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1346592227 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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