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

Frederick William Penczak, MD

Individual provider Surgery Physician · NPI 1841379070

Frederick William Penczak, MD is a General Surgery in San Rafael, California. Graduated from Medical College of Pennsylvania in 1999, 27 years ago. Accepts Medicare assignment. Licensed in California.

Years since qualifying
27
Trained at
Medical College of Pennsylvania
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

78 Creekside Dr
San Rafael, CA 94903-1055
Phone: (707) 939-7411
Fax: (707) 939-1617
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 00A685120 (CA)

Record details

NPI number1841379070
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 6, 2006
Last updated in NPPESApril 25, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL SURGERY
Also practisesNEUROSURGERY, ORTHOPEDIC SURGERY
Medical schoolMEDICAL COLLEGE OF PENNSYLVANIA
Graduated 1999 (27 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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