DR. LAZAR JOHN JR. GREENFIELD (M.D., PH.D.) – Neurology Physician, NPI 1841286994
Neurology Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
509 NEUROLOGY in CT
Provider Addresses for DR. LAZAR JOHN JR. GREENFIELD (M.D., PH.D.)
UCONN MEDICAL GROUP
263 FARMINGTON AVE
FARMINGTON, CT 060300001
Phone: (860) 679-4888
Fax: (860) 679-0131
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $4,589.
Total Amount is formed as General ($4,589) + Research ($0) + Ownership ($0) = $4,589.
Last reported payment date: 2023-11-09 • Largest payer in this snapshot: PTC Therapeutics, Inc. ($4,500).
Total Amount
$4,589
General + Research + Ownership
Payments
2
Total payment records
General Amount
$4,589
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-11-09
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| PTC Therapeutics, Inc. | $4,500 |
| SK Life Science, Inc. | $89 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2016-09-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20160912000298 | I | Neurology | CT | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 45 | 38 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 31 | 29 | $0 |
| 95812 | Measurement of brain wave activity (eeg), 41-60 minutes | 22 | 22 | $0 |
| 99223 | Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 14 | 14 | $0 |
| 95819 | Measurement of brain wave activity (eeg), awake and asleep | 12 | 12 | $0 |
Insurance plans in this area (ZIP 06030)
Loading plans...
Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEUROLOGY | CT | 95819 | Measurement and recording of brain wave (EEG) activity, awake and asleep | 24 | 24 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | CT | |
| - | CT | |
| Orthopedic Surgery | MA | |
| Sleep Medicine | CT | |
| - | CT | |
| Physician Assistant | CT | |
| Nurse Practitioner | CT | |
| - | CT | |
| P S Y C H I A T R Y | CT | |
| Internal Medicine | NY |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.