Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mrs. Mary Grover Newcomer
Psychologist in Mill Valley, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649478488
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Registry record
Entity type Individual (Type 1)
Name Mrs. Mary Grover Newcomer
Sex Female
Practice address 205 Camino Alto, Ste 270, Mill Valley, CA, 94941
Phone (415) 457-0424
Enumeration date Jul 3, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY12391 (CA) Primary
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| OPL123910 | Other | CA | BLUE SHIELD |
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
What specialty is Mary Newcomer?
Mary Newcomer is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.