Quick answers
- Does Zainab D. Mezban accept Medicare assignment?
- Yes. Medicare's clinician data says Zainab D. Mezban 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 Zainab D. Mezban see?
- In 2024, CMS data shows 265 Original Medicare patients and 624 services for Zainab D. Mezban. This counts Original Medicare only and measures volume, not quality.
- What is Zainab D. Mezban's NPI number?
- 1275621872. 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 Zainab D. Mezban, 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 | 265 |
|---|---|
| Services billed to Medicare | 624 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)240 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)215 services
- Hospital discharge day management, more than 30 minutes (99239)101 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)37 services
- Emergency department visit with high level of medical decision making (99285)11 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 cholesterol74%
- Chronic kidney disease52%
- Arthritis50%
- Heart failure45%
- Diabetes42%
Hospitals where Zainab D. Mezban works
Medicare's Facility Affiliation Data lists Zainab D. Mezban 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 - Walnut CreekWalnut Creek, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050072
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050689
- Sutter Solano Medical CenterVallejo, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050101
Practice locations
Addresses where Zainab D. Mezban is enrolled with Medicare (CMS data updated October 2, 2026).
- 1425 S Main StWalnut Creek, CA 94596 (925) 295‑4000
- 300 Hospital DrVallejo, CA 94589 (707) 554‑4444
- 901 Nevin AveRichmond, CA 94801 (510) 307‑1500
Group practices
Medicare enrollment lists Zainab D. Mezban as a member of these groups (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
- Quantum Healthcare Medical Associates Inc109 clinicians in the group
Specialties
- Internal Medicineprimary
- Hospice/Palliative Carealso
Other internal medicine doctors in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, 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 | 1998 (28 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275621872 |
| 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