Quick answers
- Does Mary L. Petrofsky accept Medicare assignment?
- Yes. Medicare's clinician data says Mary L. Petrofsky 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 Mary L. Petrofsky see?
- In 2024, CMS data shows 17 Original Medicare patients and 100 services for Mary L. Petrofsky. This counts Original Medicare only and measures volume, not quality.
- What is Mary L. Petrofsky's NPI number?
- 1013220359. 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 Mary L. Petrofsky, 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 | 17 |
|---|---|
| Services billed to Medicare | 100 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
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 blood pressure71%
- High cholesterol65%
Hospitals where Mary L. Petrofsky works
Medicare's Facility Affiliation Data lists Mary L. Petrofsky 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.
- Peninsula Medical CenterBurlingame, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050007
- Sequoia HospitalRedwood City, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050197
- UCSF Medical CenterSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050454
Practice locations
Addresses where Mary L. Petrofsky is enrolled with Medicare (CMS data updated October 2, 2026).
- 225 California DrBurlingame, CA 94010 (650) 341‑9131
- 400 Parnassus AveSan Francisco, CA 94143
Group practices
Medicare enrollment lists Mary L. Petrofsky as a member of this group (CMS data updated October 2, 2026).
- UCSF Medical Group Business Services1,598 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Burlingame
Clinicians with the same Medicare primary specialty in Burlingame, CA — not a recommendation.
Other clinicians in UCSF Medical Group Business Services
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2008 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1013220359 |
| 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