Sonia Sierra
NPI 1356078919 · Marriage & Family Therapist · Lancaster, CA
Sonia Sierra is a Marriage & Family Therapist provider in Lancaster, CA (NPI 1356078919).
Provider details
- NPI number
- 1356078919
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 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
- 2022-08-03
- Last updated
- 2023-12-06
- Certified
- 2023-12-06
Frequently asked questions
- What is Sonia Sierra's NPI number?
- Sonia Sierra's National Provider Identifier (NPI) is 1356078919, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sonia Sierra's specialty?
- Sonia Sierra is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Sonia Sierra located?
- Sonia Sierra's practice location on file with NPPES is 921 W Avenue J Ste C, Lancaster, CA 93534-3443.
- What is Sonia Sierra's phone number?
- The practice phone number listed in the NPPES registry for Sonia Sierra is (661) 949-0131.
- Is Sonia Sierra's NPI active?
- Yes — Sonia Sierra's NPI (1356078919) is active in the NPPES registry as of the last update on 2023-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.