Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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William L. Matzner, MD, PHD

Individual provider Internal Medicine Physician · NPI 1306905716

William L. Matzner, MD, PHD is an Internal Medicine Physician in Simi Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

143 Parrot Ln
Simi Valley, CA 93065-3151
Phone: (805) 578-7000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence AO43053 (CA)

Record details

NPI number1306905716
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorYes
NPI enumeratedDecember 8, 2006
Last updated in NPPESDecember 15, 2015
Mailing addressPo Box 941570, Simi Valley, CA 93094-1570

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