Lazar John Greenfield, M.D., PH.D.
Neurology Physician · Farmington, CT
Lazar John Greenfield, M.D., PH.D. is a neurology physician with a practice address in Farmington, Connecticut, and NPI 1841286994, issued on Sep 23, 2005. Check the license (Connecticut 055487, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Lazar John Greenfield
- Credential
- M.D., PH.D.
- Primary taxonomy
- Neurology Physician 2084N0400X
- License numbers
- 055487 CT
E-6501 AR
35076214 OH
Self-reported in NPPES; status is on the state search - Practice location
- Uconn Medical Group, Farmington, CT 06030
- Phone
- (860) 679-4888
- Enumerated
- Sep 23, 2005
- Record last updated
- Sep 29, 2022
- Fax
- (860) 679-0131
- Medicaid ID
- 2132034 OH
- Medicare enrollment
- Enrolled (PECOS I20160912000298); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 345 in Connecticut → Look up another NPI →
Also registered at Uconn Medical Group
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Lazar John Greenfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 055487Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
26% fewer Medicare Part D claims than the average neurology physician in 2024
1,012 Medicare Part D claims for 98 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Levetiracetam159 claims
- Oxcarbazepine55 claims
- Gabapentin53 claims
- Divalproex Sodium51 claims
- Lamotrigine50 claims
- Carbamazepine46 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 30.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 2 group practices
- Bristol Hospital Multi Specialty Group, Inc.Bristol, CT
- University OF Connecticut Health CenterFarmington, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Lazar John Greenfield among 345 neurology physician records in Connecticut
Lazar John Greenfield, M.D., PH.D. is one of 345 neurology physician records with a practice address in Connecticut. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1989 · median 2009 among the 216 with a school on file
- Record last updated2022 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
27 neurology physician records list a practice address in Farmington
They are 27 of the 2,993 NPPES records with a practice address in Farmington, and 345 neurology physician records in Connecticut.
All 345 in Connecticut → Every provider in Farmington → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- Ashish Adlakha, MDFarmington, CT 060301639344120
- Morven Barwick, MDFarmington, CT 060301982600300
- Kevin Becker, M.D.-PH.DFarmington, CT 060301821231895
- Marie Carl Eugene, D.O.Farmington, CT 060301073703815
- Beverly Greenspan, M.D.Farmington, CT 060301376548081
- Jaime Imitola Herrera, MD.Farmington, CT 060301548420615
- Matthew Imperioli, M.D.Farmington, CT 060301356667380
- Sanjay Mittal, M.D.Farmington, CT 060301982667168
Common questions
What is Lazar John Greenfield, M.D., PH.D.'s NPI number?
Lazar John Greenfield, M.D., PH.D.'s National Provider Identifier (NPI) is 1841286994, issued on Sep 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Lazar John Greenfield, M.D., PH.D. located?
The NPPES record lists a practice address at Uconn Medical Group, Farmington, CT, 06030. Phone: (860) 679-4888. Providers update this record themselves, so call before visiting.
How can I verify Lazar John Greenfield, M.D., PH.D.'s license?
NPPES lists Connecticut license number 055487, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Lazar John Greenfield, M.D., PH.D. prescribe under Medicare Part D?
In 2024, Lazar John Greenfield, M.D., PH.D. had 1,012 Medicare Part D claims for 98 beneficiaries; the average among neurology physician prescribers was 1,370. Part D covers Medicare prescriptions only.
What is Lazar John Greenfield, M.D., PH.D.'s MIPS final score?
The 2023 MIPS final score is 30.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.