Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Stephen James Mayer, PA-C
Physician Assistant in San Jose, CA · enumerated 2012.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1285979815
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Registry record
Entity type Individual (Type 1)
Name Mr. Stephen James Mayer
Credential PA-C
Sex Male
Practice address 1893 Monterey Hwy, San Jose, CA, 95112
Phone (408) 288-3800
Fax (408) 288-3812
Enumeration date Dec 8, 2012
Last updated in NPPES Sep 10, 2015
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 13437 (NY) Secondary
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 22741 (CA) Primary
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
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.
What specialty is Stephen Mayer?
Stephen Mayer is registered in NPPES with the primary taxonomy of Physician Assistant. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-09-10.