Hillary Mastrosimone
NPI 1336483973 · Marriage & Family Therapist · Pasadena, CA
Hillary Mastrosimone is a Marriage & Family Therapist provider in Pasadena, CA (NPI 1336483973).
Provider details
- NPI number
- 1336483973
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Female
- 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
13 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
- 2012-11-20
- Last updated
- 2016-01-01
Frequently asked questions
- What is Hillary Mastrosimone's NPI number?
- Hillary Mastrosimone's National Provider Identifier (NPI) is 1336483973, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Hillary Mastrosimone's specialty?
- Hillary Mastrosimone is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Hillary Mastrosimone located?
- Hillary Mastrosimone's practice location on file with NPPES is 65 N Madison Ave, Pasadena, CA 91101-2035.
- What is Hillary Mastrosimone's phone number?
- The practice phone number listed in the NPPES registry for Hillary Mastrosimone is (626) 587-2827.
- Is Hillary Mastrosimone's NPI active?
- Yes — Hillary Mastrosimone's NPI (1336483973) is active in the NPPES registry as of the last update on 2016-01-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.