Guillermo Castellanos
NPI 1609908664 · Mental Health Counselor · Northridge, CA
Guillermo Castellanos is a Mental Health Counselor provider in Northridge, CA (NPI 1609908664).
Provider details
- NPI number
- 1609908664
- Entity type
- Individual
- Primary specialty
- Mental Health CounselorBehavioral Health & Social Service Providers
- Sex
- Male
- Sole proprietor
- Yes
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
19 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
- 2007-03-12
- Last updated
- 2007-07-08
Frequently asked questions
- What is Guillermo Castellanos's NPI number?
- Guillermo Castellanos's National Provider Identifier (NPI) is 1609908664, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Guillermo Castellanos's specialty?
- Guillermo Castellanos is listed in the NPPES registry with a primary specialty of Mental Health Counselor (Behavioral Health & Social Service Providers).
- Where is Guillermo Castellanos located?
- Guillermo Castellanos's practice location on file with NPPES is 9650 Zelzah Ave, Northridge, CA 91325-2003.
- What is Guillermo Castellanos's phone number?
- The practice phone number listed in the NPPES registry for Guillermo Castellanos is (818) 993-9311.
- Is Guillermo Castellanos's NPI active?
- Yes — Guillermo Castellanos's NPI (1609908664) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.