Quick answers
- Does Gertrudes A. Hernandez accept Medicare assignment?
- Yes. Medicare's clinician data says Gertrudes A. Hernandez 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 Gertrudes A. Hernandez see?
- In 2024, CMS data shows 26 Original Medicare patients and 360 services for Gertrudes A. Hernandez. This counts Original Medicare only and measures volume, not quality.
- What is Gertrudes A. Hernandez's NPI number?
- 1821259953. 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 Gertrudes A. Hernandez, 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 | 26 |
|---|---|
| Services billed to Medicare | 360 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Psychotherapy, 1 hour (90837)163 services
- Psychotherapy, 45 minutes (90834)114 services
- Psychotherapy, 30 minutes (90832)55 services
- Psychiatric diagnostic evaluation (90791)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 pressure73%
- High cholesterol69%
- Depression69%
- Anxiety62%
Practice locations
Addresses where Gertrudes A. Hernandez is enrolled with Medicare (CMS data updated October 2, 2026).
- 1340 Las Juntas Way, Apt DWalnut Creek, CA 94597
- 5201 Great America Pkwy, Suite 320Santa Clara, CA 95054
- 925 Ygnacio Valley Rd, Suite 102aWalnut Creek, CA 94596 (510) 301‑8655
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Walnut Creek
Clinicians with the same Medicare primary specialty in Walnut Creek, CA — not a recommendation.
Clinician information
| Graduation year | 1990 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821259953 |
| 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