Gregory Alter, PH.D.
NPI 1528168366 · Clinical Psychologist · Oakland, CA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Alter, PH.D. is a Clinical Psychologist provider in Oakland, CA (NPI 1528168366).
Provider details
- NPI number
- 1528168366
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY7422 (CA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2022-08-08
- Certified
- 2022-08-08
Frequently asked questions
- What is Gregory Alter's NPI number?
- Gregory Alter's National Provider Identifier (NPI) is 1528168366, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Alter's specialty?
- Gregory Alter is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Gregory Alter located?
- Gregory Alter's practice location on file with NPPES is 5666 Telegraph Ave, Oakland, CA 94609-1708.
- What is Gregory Alter's phone number?
- The practice phone number listed in the NPPES registry for Gregory Alter is (510) 545-6463.
- Does Gregory Alter accept Medicare?
- Gregory Alter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Alter's NPI active?
- Yes — Gregory Alter's NPI (1528168366) is active in the NPPES registry as of the last update on 2022-08-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.