John Grienenberger, PH.D.
NPI 1275835936 · Clinical Psychologist · Los Angeles, CA
John Grienenberger, PH.D. is a Clinical Psychologist provider in Los Angeles, CA (NPI 1275835936).
Provider details
- NPI number
- 1275835936
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- PH.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- PSY 23880 (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 tenure38% of score
15 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
- 2010-11-30
- Last updated
- 2010-11-30
Frequently asked questions
- What is John Grienenberger's NPI number?
- John Grienenberger's National Provider Identifier (NPI) is 1275835936, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Grienenberger's specialty?
- John Grienenberger is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is John Grienenberger located?
- John Grienenberger's practice location on file with NPPES is 11340 W Olympic Blvd, Los Angeles, CA 90064-1608.
- What is John Grienenberger's phone number?
- The practice phone number listed in the NPPES registry for John Grienenberger is (310) 477-6008.
- Is John Grienenberger's NPI active?
- Yes — John Grienenberger's NPI (1275835936) is active in the NPPES registry as of the last update on 2010-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.