Isabel Sierra
NPI 1366100398 · Marriage & Family Therapist · Crestline, CA
Isabel Sierra is a Marriage & Family Therapist provider in Crestline, CA (NPI 1366100398).
Provider details
- NPI number
- 1366100398
- Entity type
- Individual
- Primary specialty
- Marriage & Family TherapistBehavioral Health & Social Service Providers
- Sex
- Female
- Sole proprietor
- No
Specialties & taxonomies
Behavioral Health & Social Service Providers
- Case Manager/Care Coordinator171M00000X
Other 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
4 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
- 2021-12-07
- Last updated
- 2025-07-29
- Certified
- 2025-07-29
Frequently asked questions
- What is Isabel Sierra's NPI number?
- Isabel Sierra's National Provider Identifier (NPI) is 1366100398, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Isabel Sierra's specialty?
- Isabel Sierra is listed in the NPPES registry with a primary specialty of Marriage & Family Therapist (Behavioral Health & Social Service Providers).
- Where is Isabel Sierra located?
- Isabel Sierra's practice location on file with NPPES is 340 Ca-138, Crestline, CA 92325-9232.
- What is Isabel Sierra's phone number?
- The practice phone number listed in the NPPES registry for Isabel Sierra is (909) 336-3330.
- Is Isabel Sierra's NPI active?
- Yes — Isabel Sierra's NPI (1366100398) is active in the NPPES registry as of the last update on 2025-07-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.