Isabel N. Sierra
Marriage & Family Therapist · Crestline, CA
Isabel N. Sierra is a marriage & family therapist with a practice address in Crestline, California, and NPI 1366100398, issued on Dec 7, 2021. Check the license (California 156441, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Isabel N. Sierra
- Primary taxonomy
- Marriage & Family Therapist 106H00000X
- License number
- 156441 CA
Self-reported in NPPES; status is on the state search - Practice location
- 340 CA-138, Crestline, CA 92325
- Phone
- (909) 336-3330
- Enumerated
- Dec 7, 2021
- Record last updated
- Jul 29, 2025
- Entity
- Type 1 · individual
Also registered at 340 CA-138
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Adriana BuonocoreStudent in an Organized Health Care Education/Training Program1407515125
- Carmen CabreraCase Manager/Care Coordinator1164892584
- Megan FallisStudent in an Organized Health Care Education/Training Program1396496386
- Maria Lopez-Sopher, BAStudent in an Organized Health Care Education/Training Program1851035976
- Dylan McKelroyMarriage & Family Therapist1831896968
- Jennifer ThompsonMental Health Counselor1033877998
Verify Isabel N. Sierra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 156441Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24 marriage & family therapist records list a practice address in Crestline
They are 24 of the 133 NPPES records with a practice address in Crestline, and 59,889 marriage & family therapist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 24 in Crestline → All 59,889 in California → Every provider in Crestline →
Other marriage & family therapist records in California
- Lili Aames, LMFTSanta Fe Springs, CA1689836165
- Lynn Aamot, LMFTEl Dorado Hills, CA1508255027
- Nathan Aanderud, LMFTTorrance, CA1689036907
- Alex AaronSherman Oaks, CA1578442620
- Bianca Aaron, LMFT, APCCSan Francisco, CA1316459605
- Kelley Aaron, MFTLos Angeles, CA1699068866
- Ruth Aaron, MS, JD, MFTClaremont, CA1316029697
- Terry Aaron, MFTBurbank, CA1386801173
- Azadeh Aarons, LMFTThousand Oaks, CA1679343974
- Bianca Aarons, MA,LMFTSan Francisco, CA1699286732
Common questions
What is Isabel N. Sierra's NPI number?
Isabel N. Sierra's National Provider Identifier (NPI) is 1366100398, issued on Dec 7, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Isabel N. Sierra located?
The NPPES record lists a practice address at 340 CA-138, Crestline, CA, 92325. Phone: (909) 336-3330. Providers update this record themselves, so call before visiting.
How can I verify Isabel N. Sierra's license?
NPPES lists California license number 156441, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.