Quick answers
- Does Kourosh Mastali accept Medicare assignment?
- Yes. Medicare's clinician data says Kourosh Mastali 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 Kourosh Mastali see?
- In 2024, CMS data shows 86 Original Medicare patients and 111 services for Kourosh Mastali. This counts Original Medicare only and measures volume, not quality.
- What is Kourosh Mastali's NPI number?
- 1518907310. 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 Kourosh Mastali, 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 | 86 |
|---|---|
| Services billed to Medicare | 111 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)33 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)28 services
- Insertion of tube in left lower heart chamber and coronary artery for diagnosis with review by radiologist (93458)13 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 blood pressure75%
- High cholesterol63%
- Ischemic heart disease53%
- Heart failure48%
- Diabetes45%
- Chronic kidney disease43%
Hospitals where Kourosh Mastali works
Medicare's Facility Affiliation Data lists Kourosh Mastali 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.
- Kaiser Foundation Hospital - Oakland/RichmondOakland, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050075
- Kaiser Foundation Hospital - San FranciscoSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050076
- Kaiser Foundation Hospital - VacavilleVacaville, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050767
- Kaiser Foundation Hospital and Rehab CenterVallejo, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050073
Practice locations
Addresses where Kourosh Mastali is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 10; the Medicare profile lists all.
- 1 Quality DrVacaville, CA 95688 (707) 624‑4000
- 1425 S Main StWalnut Creek, CA 94596 (925) 295‑4000
- 2200 Ofarrell StSan Francisco, CA 94115 (415) 833‑2000
- 2425 Geary BlvdSan Francisco, CA 94115 (415) 833‑2200
- 275 W Macarthur BlvdOakland, CA 94611 (510) 752‑1000
Group practices
Medicare enrollment lists Kourosh Mastali as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in Vacaville
Clinicians with the same Medicare primary specialty in Vacaville, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1992 (34 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1518907310 |
| 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