Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Lazar John Greenfield Jr., MD, PHD

Individual provider Neurology Physician · NPI 1841286994

Dr. Lazar John Greenfield Jr., MD, PHD practises Neurology in Farmington, Connecticut. Graduated from University of Virginia School of Medicine in 1989, 37 years ago. Practices with University of Connecticut Health Center, a 628-clinician group and accepts Medicare assignment. Licensed in Arkansas, Connecticut and Ohio.

Years since qualifying
37
Trained at
University of Virginia School of Medicine
Licensed in
AR, CT, OH
In the registry since
2005
Specialties on file
4
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 Partly verified

Some contact details are missing from the federal record.

Uconn Medical Group 263 Farmington Ave
Farmington, CT 06030-0001
Phone: (860) 679-4888
Fax: (860) 679-0131
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurology Physician (primary) Taxonomy 2084N0400X · Licence 055487 (CT)
Neurology Physician Taxonomy 2084N0400X · Licence 35076214 (OH)
Clinical Neurophysiology Physician Taxonomy 2084N0600X · Licence E-6501 (AR)
Clinical Neurophysiology Physician Taxonomy 2084N0600X · Licence 055487 (CT)

Record details

NPI number1841286994
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedSeptember 23, 2005
Last updated in NPPESSeptember 29, 2022

Medicare enrollment

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

Medicare specialtyNEUROLOGY
Medical schoolUNIVERSITY OF VIRGINIA SCHOOL OF MEDICINE
Graduated 1989 (37 years in practice)
Group practice University Of Connecticut Health Center — 628 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients161
Services billed 283 a service is one billed item, such as a visit, a test or a procedure
Average patient age69

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. Those with a page here are linked.

  • Bristol Hospital Hospital · Bristol, CT · listed as Bristol Hospital Inc
  • John Dempsey Hospital Of The University Of Connect Hospital · Farmington, CT

Colleagues at University of Connecticut Health Center

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 628 clinicians in the practice; 12 are shown here.

Other providers in Farmington