Quick answers
- Does Zachary Cooper accept Medicare assignment?
- Yes. Medicare's clinician data says Zachary Cooper 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 Zachary Cooper see?
- In 2024, CMS data shows 2,044 Original Medicare patients and 18,448 services for Zachary Cooper. This counts Original Medicare only and measures volume, not quality.
- What is Zachary Cooper's NPI number?
- 1659309904. 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 Zachary Cooper, 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 | 2,044 |
|---|---|
| Services billed to Medicare | 18,448 |
| Different services or procedures | 52 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Destruction of precancer skin growth, 2-14 growths (17003)7,441 services
- Destruction of precancer skin growth, 15 or more growths (17004)2,797 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)2,775 services
- Destruction of precancer skin growth, 1 growth (17000)1,326 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)1,009 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 cholesterol73%
- High blood pressure66%
- Arthritis42%
- Ischemic heart disease19%
- Diabetes18%
- Atrial fibrillation18%
Hospitals where Zachary Cooper works
Medicare's Facility Affiliation Data lists Zachary Cooper 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.
- Adventist Health SonoraSonora, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050335
Practice locations
Addresses where Zachary Cooper is enrolled with Medicare (CMS data updated October 2, 2026).
- 19933 Greenley Rd, Suite CSonora, CA 95370 (209) 536‑0505
Specialties
- Dermatologyprimary
Other dermatologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Stanford University School Of Medicine |
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659309904 |
| 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