JON J ERNSTOFF (M.D.) – Gastroenterology Physician, NPI 1598789653
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
829 GASTROENTEROLOGY in MA
Provider Addresses for JON J ERNSTOFF (M.D.)
48 Sanderson St Fl 2
Greenfield, MA 013012778
Phone: (413) 773-2655
Fax: (413) 773-2629
Type: Location
2139, Silas Deane Highway, Rocky Hill, Hartford County, Connecticut, 06067, United States
ROCKY HILL, CT 060672336
Phone: (860) 257-4131
Fax: (860) 257-4519
Type: Mailing
455, Lewis Avenue, Meriden, New Haven County, Connecticut, 06451, United States
SUITE 106
MERIDEN, CT 064512121
Phone: (203) 886-0036
Fax: (203) 886-0072
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 8 Open Payments records for all available years, with a total value of $155.
Total Amount is formed as General ($155) + Research ($0) + Ownership ($0) = $155.
Last reported payment date: 2023-07-31 • Largest payer in this snapshot: Gilead Sciences, Inc. ($33).
Total Amount
$155
General + Research + Ownership
Payments
8
Total payment records
General Amount
$155
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-07-31
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2025-03-14
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20061013000377 | I | Gastroenterology | CT | TBD |
| I20250314001246 | I | Gastroenterology | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 134 | 114 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 23 | 23 | $0 |
| 82272 | Stool analysis for blood, by peroxidase activity | 20 | 20 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 16 | 16 | $0 |
Insurance plans in this area (ZIP 01301)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | MA | |
| Anesthesiology, Pain Management | MA | |
| Physician Assistant | MA | |
| - | MA | |
| - | MA | |
| - | MA | |
| - | MA | |
| - | MA | |
| Physician Assistant | MA | |
| Physician Assistant | MA |
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