Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Joan Ellen Sommer, PHD
Psychologist in San Rafael, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1215038153
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Registry record
Entity type Individual (Type 1)
Name Dr. Joan Ellen Sommer
Credential PHD
Sex Female
Practice address 1330 Lincoln Ave, Suite 309, San Rafael, CA, 94901
Phone (415) 482-1122
Enumeration date Sep 25, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY14833 (CA) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Joan Sommer practice?
The practice location on file with NPPES is in San Rafael, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Joan Sommer?
The National Provider Identifier (NPI) for Joan Sommer is 1215038153, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Ann Rivo Mental Health Counselor · San Rafael, CA NPI 1972574929 Community Institute for Psychotherapy Voluntary or Charitable Agency · San Rafael, CA NPI 1760403794 Robin Briskin Berenson Marriage & Family Therapist · San Rafael, CA NPI 1033133020 Jeana Reynolds Marriage & Family Therapist · San Rafael, CA NPI 1528173317 Arlene Reiss Marriage & Family Therapist · San Rafael, CA NPI 1104933324 Torri Campbell Clinical Psychologist · San Rafael, CA NPI 1871686162 Lara Saft Marriage & Family Therapist · San Rafael, CA NPI 1225122088 Sarah Brewster Marriage & Family Therapist · San Rafael, CA NPI 1275629834
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.