John Derenski, M.A.
NPI 1134269970 · Marriage & Family Therapist · Encino, CA
John Derenski, M.A. is a Marriage & Family Therapist provider in Encino, CA (NPI 1134269970).
Provider details
- NPI number
- 1134269970
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Credential
- M.A.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 14575 (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
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
- 2007-02-08
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Derenski's NPI number?
- John Derenski's National Provider Identifier (NPI) is 1134269970, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Derenski's specialty?
- John Derenski is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is John Derenski located?
- John Derenski's practice location on file with NPPES is 6345 Balboa Blvd, Encino, CA 91316-1519.
- What is John Derenski's phone number?
- The practice phone number listed in the NPPES registry for John Derenski is (818) 349-5965.
- Is John Derenski's NPI active?
- Yes — John Derenski's NPI (1134269970) 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.