NATHAN E. RIDDELL (M.D.) – Cardiovascular Disease Physician, NPI 1245670983
Cardiovascular Disease Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
7,722 INTERNAL MEDICINE in MA
Provider Addresses for NATHAN E. RIDDELL (M.D.)
1115 Westford St Ste 2
Lowell, MA 018512853
Phone: (351) 221-7080
Type: Location
55 LAKE AVE N
WORCESTER, MA 016550002
Phone: (508) 334-1000
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 39 Open Payments records for all available years, with a total value of $4,516.
Total Amount is formed as General ($4,516) + Research ($0) + Ownership ($0) = $4,516.
Last reported payment date: 2024-12-17 • Largest payer in this snapshot: ABIOMED ($2,750).
Total Amount
$4,516
General + Research + Ownership
Payments
39
Total payment records
General Amount
$4,516
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-17
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABIOMED | $2,750 |
| Penumbra, Inc. | $854 |
| Boston Scientific Corporation | $335 |
| Amgen Inc. | $140 |
| Novartis Pharmaceuticals Corporation | $129 |
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: 2018-08-09
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 |
|---|---|---|---|---|
| I20180809005466 | I | Internal Medicine | 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 |
|---|---|---|---|---|
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 630 | 527 | $0 |
| 93306 | Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 297 | 295 | $0 |
| 93000 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 166 | 160 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 121 | 86 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 88 | 77 | $0 |
Insurance plans in this area (ZIP 01851)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Cardiovascular Disease (Cardiology), Internal Medicine | MA | |
| Cardiovascular Disease (Cardiology), Internal Medicine | MA | |
| Interventional Cardiology, Cardiovascular Disease (Cardiology), Internal Medicine | MA | |
| Cardiovascular Disease (Cardiology) | MA | |
| - | MA | |
| Internal Medicine | MA | |
| - | MA | |
| Cardiovascular Disease (Cardiology) | MA | |
| Cardiovascular Disease (Cardiology) | NJ | |
| Cardiovascular Disease (Cardiology) | MA |
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