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

Jeffrey R Breneisen, MD

Individual provider Cardiovascular Disease Physician · NPI 1629058615

Jeffrey R Breneisen, MD is a Cardiovascular Disease (Cardiology) in Fairfield, California. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 1993, 33 years ago. Practices with Northbay Health Medical Foundation, a 202-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
33
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
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

1860 Pennsylvania Ave Ste 120
Fairfield, CA 94533-3590
Phone: (707) 646-4400
Fax: (707) 646-4401
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence G86677 (CA)

Record details

NPI number1629058615
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 18, 2006
Last updated in NPPESJuly 31, 2015

Medicare enrollment

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

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 1993 (33 years in practice)
Group practice Northbay Health Medical Foundation — 202 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Other providers in Fairfield