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

Dr. Fred John Vonstieff, MD

Individual provider Addiction Medicine (Family Medicine) Physician · NPI 1790849685

Dr. Fred John Vonstieff, MD is an Addiction Medicine in Concord, California. Graduated from Un of California, Irvine, College of Medicine in 1976, 50 years ago. Practices with Fred J Von Stieff MD a Professional Corporation, a 3-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
50
Trained at
Un of California, Irvine, College of Medicine
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

2481 Pacheco St
Concord, CA 94520-2019
Phone: (925) 680-8933
Fax: (925) 680-7635
Show map & directions

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

Specialties & licences

Addiction Medicine (Family Medicine) Physician (primary) Taxonomy 207QA0401X · Licence G34928 (CA)

Record details

NPI number1790849685
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 21, 2006
Last updated in NPPESJuly 30, 2014

Medicare enrollment

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

Medicare specialtyADDICTION MEDICINE
Also practisesINTERNAL MEDICINE
Medical schoolUN OF CALIFORNIA, IRVINE, COLLEGE OF MEDICINE
Graduated 1976 (50 years in practice)
Group practice Fred J Von Stieff Md A Professional Corporation — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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