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

WILLIAM CHEN

Allopathic & Osteopathic Physicians Internal Medicine

NPI
1851498372
CMS profile
444653
Location
SAN PABLO, CA

General Payments · PY2018–2024

$7,684.34

  • Reported across 411 records
  • CMS publication 2026-01-23

Latest program year · PY2024

$725.78

39 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 $618.34 37
Education $107.44 2

By paying entity

PY2024 · sorted by reported total

Paying entityAmountRecords
Acerta Pharma LLC $326.11 8
Sumitomo Pharma America, Inc. $231.82 26
Astellas Pharma US Inc $150.41 4
PFIZER INC. $17.44 1

By program year

All program years on this page · sorted by year

Program yearAmountRecords
PY2018 $930.33 74
PY2019 $421.40 30
PY2020 $2,713.84 124
PY2021 $1,488.43 78
PY2022 $742.24 27
PY2023 $662.32 39
PY2024 $725.78 39

Payment records · PY2024 (39)

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

Program year 2024 201820192020202120222023 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
Astellas Pharma US Inc $90.00 02/14/2024 Education Undisputed 01/23/2026 1139343598 CMS
Astellas Pharma US Inc $21.66 09/23/2024 Food and Beverage Undisputed 01/23/2026 1139406927 CMS
Astellas Pharma US Inc $24.96 11/01/2024 Food and Beverage Undisputed 01/23/2026 1139426592 CMS
Astellas Pharma US Inc $13.79 12/20/2024 Food and Beverage Undisputed 01/23/2026 1139444926 CMS
AstraZeneca Pharmaceuticals LP $110.66 01/26/2024 Food and Beverage Undisputed 01/23/2026 1105700198 CMS
AstraZeneca Pharmaceuticals LP $34.76 01/30/2024 Food and Beverage Undisputed 01/23/2026 1104449045 CMS
AstraZeneca Pharmaceuticals LP $30.20 03/20/2024 Food and Beverage Undisputed 01/23/2026 1105677899 CMS
AstraZeneca Pharmaceuticals LP $34.95 05/24/2024 Food and Beverage Undisputed 01/23/2026 1104286050 CMS
AstraZeneca Pharmaceuticals LP $20.22 06/11/2024 Food and Beverage Undisputed 01/23/2026 1105518861 CMS
AstraZeneca Pharmaceuticals LP $34.28 09/13/2024 Food and Beverage Undisputed 01/23/2026 1105741980 CMS
AstraZeneca Pharmaceuticals LP $29.81 10/11/2024 Food and Beverage Undisputed 01/23/2026 1105382020 CMS
AstraZeneca Pharmaceuticals LP $31.23 11/21/2024 Food and Beverage Undisputed 01/23/2026 1105617505 CMS
PFIZER INC. $17.44 05/29/2024 Education Undisputed 01/23/2026 1131597557 CMS
Sumitomo Pharma America, Inc. $15.24 01/04/2024 Food and Beverage Undisputed 01/23/2026 1148837393 CMS
Sumitomo Pharma America, Inc. $23.80 01/22/2024 Food and Beverage Undisputed 01/23/2026 1148837395 CMS
Sumitomo Pharma America, Inc. $18.53 01/31/2024 Food and Beverage Undisputed 01/23/2026 1148837397 CMS
Sumitomo Pharma America, Inc. $22.03 02/09/2024 Food and Beverage Undisputed 01/23/2026 1148837399 CMS
Sumitomo Pharma America, Inc. $6.22 03/04/2024 Food and Beverage Undisputed 01/23/2026 1148837401 CMS
Sumitomo Pharma America, Inc. $7.68 03/04/2024 Food and Beverage Undisputed 01/23/2026 1148837403 CMS
Sumitomo Pharma America, Inc. $8.44 04/04/2024 Food and Beverage Undisputed 01/23/2026 1148837405 CMS
Sumitomo Pharma America, Inc. $8.33 04/09/2024 Food and Beverage Undisputed 01/23/2026 1148837407 CMS
Sumitomo Pharma America, Inc. $8.79 04/26/2024 Food and Beverage Undisputed 01/23/2026 1148837409 CMS
Sumitomo Pharma America, Inc. $13.57 05/29/2024 Food and Beverage Undisputed 01/23/2026 1148837411 CMS
Sumitomo Pharma America, Inc. $8.07 06/25/2024 Food and Beverage Undisputed 01/23/2026 1148837413 CMS
Sumitomo Pharma America, Inc. $2.07 07/18/2024 Food and Beverage Undisputed 01/23/2026 1148837415 CMS
Sumitomo Pharma America, Inc. $2.43 07/18/2024 Food and Beverage Undisputed 01/23/2026 1148837417 CMS
Sumitomo Pharma America, Inc. $4.24 07/18/2024 Food and Beverage Undisputed 01/23/2026 1148837419 CMS
Sumitomo Pharma America, Inc. $7.90 07/18/2024 Food and Beverage Undisputed 01/23/2026 1148837421 CMS
Sumitomo Pharma America, Inc. $1.40 07/19/2024 Food and Beverage Undisputed 01/23/2026 1148837423 CMS
Sumitomo Pharma America, Inc. $5.98 07/19/2024 Food and Beverage Undisputed 01/23/2026 1148837425 CMS
Sumitomo Pharma America, Inc. $2.68 09/30/2024 Food and Beverage Undisputed 01/23/2026 1148837427 CMS
Sumitomo Pharma America, Inc. $9.17 09/30/2024 Food and Beverage Undisputed 01/23/2026 1148837429 CMS
Sumitomo Pharma America, Inc. $5.56 09/30/2024 Food and Beverage Undisputed 01/23/2026 1148837431 CMS
Sumitomo Pharma America, Inc. $7.33 09/30/2024 Food and Beverage Undisputed 01/23/2026 1148837433 CMS
Sumitomo Pharma America, Inc. $5.52 11/04/2024 Food and Beverage Undisputed 01/23/2026 1148837435 CMS
Sumitomo Pharma America, Inc. $14.00 11/04/2024 Food and Beverage Undisputed 01/23/2026 1148837437 CMS
Sumitomo Pharma America, Inc. $4.59 11/18/2024 Food and Beverage Undisputed 01/23/2026 1148837439 CMS
Sumitomo Pharma America, Inc. $5.23 11/19/2024 Food and Beverage Undisputed 01/23/2026 1148837441 CMS
Sumitomo Pharma America, Inc. $13.02 12/09/2024 Food and Beverage Undisputed 01/23/2026 1148837443 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
2018, 2019, 2020, 2021, 2022, 2023, 2024
Source files
Dataset page · Bulk file · PY2018 , PY2019 , PY2020 , PY2021 , PY2022 , PY2023 , PY2024
Generated from
OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv

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