DR. BARRY Z IZENSTEIN (M.D.) – Endocrinology, Diabetes & Metabolism Physician, NPI 1346237583
Endocrinology, Diabetes & Metabolism Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
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Provider Addresses for DR. BARRY Z IZENSTEIN (M.D.)
2, Medical Center Drive, North End, Memorial Square, Springfield, Hampden County, Massachusetts, 01199, United States
SUITE 210
SPRINGFIELD, MA 011071270
Phone: (413) 734-4667
Fax: (413) 737-1930
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 95 Open Payments records for all available years, with a total value of $2,023.
Total Amount is formed as General ($2,023) + Research ($0) + Ownership ($0) = $2,023.
Last reported payment date: 2024-08-21 • Largest payer in this snapshot: Lilly USA, LLC ($460).
Total Amount
$2,023
General + Research + Ownership
Payments
95
Total payment records
General Amount
$2,023
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-21
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Lilly USA, LLC | $460 |
| Novo Nordisk Inc | $150 |
| Mannkind Corporation | $136 |
| Radius Health, Inc. | $134 |
| Amgen Inc. | $116 |
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: 2005-06-21
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 |
|---|---|---|---|---|
| I20050621000522 | I | Endocrinology | MA | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 524 | 313 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 491 | 299 | $0 |
| 82962 | Blood glucose (sugar) test performed by hand-held instrument | 482 | 200 | $0 |
| 99490 | Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 316 | 122 | $0 |
| 83036 | Hemoglobin a1c level | 263 | 149 | $0 |
Insurance plans in this area (ZIP 01107)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| E N D O C R I N O L O G Y | MA | |
| Nurse Practitioner | MA | |
| E N D O C R I N O L O G Y | MA |
Reviews
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