Official source Data mirrored from Centers for Medicare & Medicaid Services Open Payments · General Payments · as published 2026-01-23 View official record Methodology

Covered recipient · General Payments record

NATHAN E RIDDELL

Allopathic & Osteopathic Physicians Internal Medicine Cardiovascular Disease

NPI
1245670983
CMS profile
1224381
Location
WORCESTER, MA

General Payments · PY2019–2024

$6,227.45

  • Reported across 75 records
  • CMS publication 2026-01-23

Latest program year · PY2024

$1,562.01

26 records · 0 disputed

Financial relationships do not necessarily indicate an improper relationship; the data is open to interpretation.

How these totals are calculated
  • The total is the sum of the General Payments records CMS published for the labeled program year(s), exactly as published. Nothing is estimated, weighted, or combined across categories.
  • General Payments only. Research and Ownership/Investment are separate datasets and are never summed with these figures; amounts are kept separate per program year.
  • Featured-page threshold (a presentation gate, not a judgment): records>=3 OR total>=100 (all years).
  • Methodology & Data — sourcing, labeling, and limitations.

By nature of payment

PY2024 · sorted by reported total

Nature of paymentAmountRecords
Food and Beverage $797.78 22
Travel and Lodging $764.23 4

By paying entity

PY2024 · sorted by reported total

By program year

All program years on this page · sorted by year

Program yearAmountRecords
PY2019 $99.77 1
PY2020 $80.30 5
PY2021 $129.37 7
PY2022 $1,402.10 23
PY2023 $2,953.90 13
PY2024 $1,562.01 26

Payment records · PY2024 (26)

Sorted by paying entity, then date · as published by CMS

Program year 2024 20192020202120222023 Record-level detail is published for PY2024; earlier years are summarised in “By program year”.
Paying entity Amount Date Nature of payment Dispute status Published Record ID Source
AltaThera Pharmaceuticals LLC $8.80 05/02/2024 Food and Beverage Undisputed 01/23/2026 1154344150 CMS
Amgen Inc. $30.75 05/28/2024 Food and Beverage Undisputed 01/23/2026 1116057059 CMS
Amgen Inc. $17.46 07/23/2024 Food and Beverage Undisputed 01/23/2026 1116057065 CMS
Amgen Inc. $21.65 09/12/2024 Food and Beverage Undisputed 01/23/2026 1116057072 CMS
Amgen Inc. $17.55 11/05/2024 Food and Beverage Undisputed 01/23/2026 1116057080 CMS
Amgen Inc. $28.69 12/10/2024 Food and Beverage Undisputed 01/23/2026 1116057086 CMS
AstraZeneca Pharmaceuticals LP $23.35 01/31/2024 Food and Beverage Undisputed 01/23/2026 1105480921 CMS
AstraZeneca Pharmaceuticals LP $15.18 06/25/2024 Food and Beverage Undisputed 01/23/2026 1105823469 CMS
Boston Scientific Corporation $124.77 03/27/2024 Food and Beverage Undisputed 01/23/2026 1092238002 CMS
Boston Scientific Corporation $46.10 04/17/2024 Food and Beverage Undisputed 01/23/2026 1092238000 CMS
Boston Scientific Corporation $163.83 11/07/2024 Food and Beverage Undisputed 01/23/2026 1092238004 CMS
E.R. Squibb & Sons, L.L.C. $13.55 11/19/2024 Food and Beverage Undisputed 01/23/2026 1101862814 CMS
Janssen Pharmaceuticals, Inc $18.91 07/16/2024 Food and Beverage Undisputed 01/23/2026 1078041816 CMS
Novartis Pharmaceuticals Corporation $15.99 01/11/2024 Food and Beverage Undisputed 01/23/2026 1087175597 CMS
Novartis Pharmaceuticals Corporation $21.77 03/28/2024 Food and Beverage Undisputed 01/23/2026 1087175603 CMS
Novartis Pharmaceuticals Corporation $19.82 05/21/2024 Food and Beverage Undisputed 01/23/2026 1087175613 CMS
Novartis Pharmaceuticals Corporation $14.78 07/31/2024 Food and Beverage Undisputed 01/23/2026 1087175623 CMS
Novartis Pharmaceuticals Corporation $22.62 09/05/2024 Food and Beverage Undisputed 01/23/2026 1087175631 CMS
Penumbra, Inc. $89.49 04/12/2024 Food and Beverage Undisputed 01/23/2026 1076230746 CMS
Penumbra, Inc. $186.67 04/12/2024 Travel and Lodging Undisputed 01/23/2026 1076231358 CMS
Penumbra, Inc. $20.49 04/12/2024 Travel and Lodging Undisputed 01/23/2026 1076231820 CMS
Penumbra, Inc. $540.60 04/12/2024 Travel and Lodging Undisputed 01/23/2026 1076232348 CMS
Penumbra, Inc. $16.47 04/14/2024 Travel and Lodging Undisputed 01/23/2026 1076231904 CMS
PFIZER INC. $27.23 07/18/2024 Food and Beverage Undisputed 01/23/2026 1131793757 CMS
PFIZER INC. $27.49 10/23/2024 Food and Beverage Undisputed 01/23/2026 1130876526 CMS
PFIZER INC. $28.00 12/17/2024 Food and Beverage Undisputed 01/23/2026 1131215704 CMS

Source & provenance

Dataset
CMS Open Payments — General Payments
Publisher of source data
Centers for Medicare & Medicaid Services
CMS publication date
2026-01-23
Program years on this page
2019, 2020, 2021, 2022, 2023, 2024
Source files
Dataset page · Bulk file · PY2019 , PY2020 , PY2021 , PY2022 , PY2023 , PY2024
Generated from
OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv

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