Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Alison S Breen, MD

Individual provider Obstetrics & Gynecology Physician · NPI 1942434238

Alison S Breen, MD practises Obstetrics/Gynecology in Sacramento, California. Graduated from University of California, Davis School of Medicine in 2009, 17 years ago. Practices with Regents of the Univ of Ca, a 1,578-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
17
Trained at
University of California, Davis School of Medicine
Licensed in
CA
In the registry since
2009
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

4860 Y St Ste 2500
Sacramento, CA 95817-2307 Not confirmed with CMS for 10 years — call before visiting
Phone: (916) 734-6978
Fax: (916) 734-6666
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence A113675 (CA)

Record details

NPI number1942434238
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 14, 2009
Last updated in NPPESAugust 24, 2016

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, DAVIS SCHOOL OF MEDICINE
Graduated 2009 (17 years in practice)
Group practice Regents Of The Univ Of Ca — 1578 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients44
Services billed 77 a service is one billed item, such as a visit, a test or a procedure
Average patient age66

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Regents of the Univ of Ca

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1578 clinicians in the practice; 12 are shown here.

Other providers in Sacramento