Shannon Grethel, PSY.D.
NPI 1629256607 · Clinical Neuropsychologist · Vallejo, CA
Shannon Grethel, PSY.D. is a Clinical Neuropsychologist provider in Vallejo, CA (NPI 1629256607).
Provider details
- NPI number
- 1629256607
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PSY.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- PSY21763 (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
18 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
- 2008-02-01
- Last updated
- 2009-05-22
Frequently asked questions
- What is Shannon Grethel's NPI number?
- Shannon Grethel's National Provider Identifier (NPI) is 1629256607, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Shannon Grethel's specialty?
- Shannon Grethel is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is Shannon Grethel located?
- Shannon Grethel's practice location on file with NPPES is 975 Sereno Dr, Vallejo, CA 94589-2441.
- What is Shannon Grethel's phone number?
- The practice phone number listed in the NPPES registry for Shannon Grethel is (832) 370-7960.
- Is Shannon Grethel's NPI active?
- Yes — Shannon Grethel's NPI (1629256607) is active in the NPPES registry as of the last update on 2009-05-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.