Rex Sagayaga
NPI 1588839716 · Mental Health Counselor · Castro Valley, CA
Rex Sagayaga is a Mental Health Counselor provider in Castro Valley, CA (NPI 1588839716).
Provider details
- NPI number
- 1588839716
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- No
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
83% 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
- 2008-04-29
- Last updated
- 2008-05-08
Frequently asked questions
- What is Rex Sagayaga's NPI number?
- Rex Sagayaga's National Provider Identifier (NPI) is 1588839716, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Sagayaga's specialty?
- Rex Sagayaga is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Rex Sagayaga located?
- Rex Sagayaga's practice location on file with NPPES is 5248 Crane Ave, Castro Valley, CA 94546-2532.
- What is Rex Sagayaga's phone number?
- The practice phone number listed in the NPPES registry for Rex Sagayaga is (510) 538-3060.
- Is Rex Sagayaga's NPI active?
- Yes — Rex Sagayaga's NPI (1588839716) is active in the NPPES registry as of the last update on 2008-05-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.