Margaret Koster, LCSW
Psychologist · Willits, CA
Margaret Koster, LCSW is a psychologist with a practice address in Willits, California, and NPI 1770609919, issued on Mar 21, 2007. Check the license (California LCS5820, 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
- Margaret Koster
- Credential
- LCSW
- Primary taxonomy
- Psychologist 103T00000X
- License number
- LCS5820 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16100 N Highway 101 Spc 72, Willits, CA 95490
- Phone
- (707) 459-5970
- Enumerated
- Mar 21, 2007
- Record last updated
- Sep 11, 2025
- Entity
- Type 1 · individual
Verify Margaret Koster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license LCS5820Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Psychologist providers in California
There are 7,304 psychologist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
Other psychologist records in California
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- Michael Abbott, PSYDModesto, CA1346498151
- Riley AbelesLos Angeles, CA1841861945
- Jenna Abell, PSYDLos Angeles, CA1073743969
- Sheri Abercrombie, PSY.D.San Diego, CA1932292422
- Tseday Aberra, PSY.D.Corona, CA1104026517
- Elham Abouhamzeh, PSY.DIrvine, CA1386092880
- Lilit Abraamyan-ChaidezBurbank, CA1710433289
- Mackenzie Abraham, PHDRedondo Beach, CA1881053833
- Sandra Abraham, PSYDSanta Fe Springs, CA1427467851
Common questions
What is Margaret Koster, LCSW's NPI number?
Margaret Koster, LCSW's National Provider Identifier (NPI) is 1770609919, issued on Mar 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Margaret Koster, LCSW located?
The NPPES record lists a practice address at 16100 N Highway 101 Spc 72, Willits, CA, 95490. Phone: (707) 459-5970. Providers update this record themselves, so call before visiting.
How can I verify Margaret Koster, LCSW's license?
NPPES lists California license number LCS5820, 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.