Gertrudes Hernandez, PHD
NPI 1821259953 · Clinical Psychologist · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gertrudes Hernandez, PHD is a Clinical Psychologist provider in Walnut Creek, CA (NPI 1821259953).
Provider details
- NPI number
- 1821259953
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Female
- Sole proprietor
- Yes
- License
- PSY23706 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
18 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
345 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Psychotherapy, 1 Hour90837 | 163 | $172 |
| Psychotherapy, 45 Minutes90834 | 114 | $116 |
| Psychotherapy, 30 Minutes90832 | 55 | $88 |
| Psychiatric Diagnostic Evaluation90791 | 13 | $195 |
Typical Medicare-allowed amounts for these services range $88–$195 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-06-20
- Last updated
- 2021-07-27
- Certified
- 2021-07-27
Frequently asked questions
- What is Gertrudes Hernandez's NPI number?
- Gertrudes Hernandez's National Provider Identifier (NPI) is 1821259953, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gertrudes Hernandez's specialty?
- Gertrudes Hernandez is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Gertrudes Hernandez located?
- Gertrudes Hernandez's practice location on file with NPPES is 2815 Mitchell Dr Ste 119, Walnut Creek, CA 94598-1622.
- What is Gertrudes Hernandez's phone number?
- The practice phone number listed in the NPPES registry for Gertrudes Hernandez is (510) 301-8655.
- Does Gertrudes Hernandez accept Medicare?
- Gertrudes Hernandez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gertrudes Hernandez's NPI active?
- Yes — Gertrudes Hernandez's NPI (1821259953) is active in the NPPES registry as of the last update on 2021-07-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.