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Dr. William Howard Trolan, MD

Preventive Medicine/Occupational Environmental Medicine Physician in Santa Clara, CA · enumerated 2007 · practices at Santa Clara Imaging Center, LLC.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1396889051

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Registry record

Entity type Individual (Type 1)
Name Dr. William Howard Trolan
Credential MD
Sex Male
Practice address 1825 Civic Center Drive, Suite 7, Santa Clara, CA, 95050
Phone (408) 985-2401
Fax (408) 985-2405
Enumeration date Feb 16, 2007
Last updated in NPPES Jan 30, 2008

Taxonomy & licenses

2083P0500X Preventive Medicine/Occupational Environmental Medicine Physician Allopathic & Osteopathic Physicians · License G60676 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

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Frequently asked questions

Where does William Trolan practice?
The practice location on file with NPPES is in Santa Clara, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Trolan?
The National Provider Identifier (NPI) for William Trolan is 1396889051, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-01-30.