Quick answers
- Does Oscar A. Fernandez accept Medicare assignment?
- Yes. Medicare's clinician data says Oscar A. Fernandez 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 Oscar A. Fernandez see?
- In 2024, CMS data shows 170 Original Medicare patients and 196 services for Oscar A. Fernandez. This counts Original Medicare only and measures volume, not quality.
- What is Oscar A. Fernandez's NPI number?
- 1235166430. 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 Oscar A. Fernandez, 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 | 170 |
|---|---|
| Services billed to Medicare | 196 |
| Different services or procedures | 48 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Anesthesia for lens surgery (00142)26 services
- Anesthesia for other procedure on nose and sinuses (00160)11 services
- Anesthesia for procedure on nerves, muscles, tendons, and tissue of forearm, wrist, and hand (01810)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 cholesterol75%
- High blood pressure71%
- Arthritis45%
- Diabetes32%
- Ischemic heart disease24%
- Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)20%
Practice locations
Addresses where Oscar A. Fernandez is enrolled with Medicare (CMS data updated October 2, 2026).
- 2405 Shadelands Dr, Suite 200Walnut Creek, CA 94598 (925) 935‑6700
- 2425 Samaritan DrSan Jose, CA 95124 (408) 559‑2011
Group practices
Medicare enrollment lists Oscar A. Fernandez as a member of these groups (CMS data updated October 2, 2026).
- Cep America - Anesthesia PC849 clinicians in the group
- G2 Anesthesia PC107 clinicians in the group
Specialties
- Anesthesiologyprimary
Other anesthesiologists in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Other clinicians in Cep America - Anesthesia PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Miami, Lm Miller School Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235166430 |
| 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
- 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