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

BILLY C ZHANG

Allopathic & Osteopathic Physicians Internal Medicine

NPI
1871087957
CMS profile
4749811
Location
IRVINE, CA

General Payments · PY2019–2024

$545.99

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

Latest program year · PY2024

$306.44

15 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 $306.44 15

By paying entity

PY2024 · sorted by reported total

By program year

All program years on this page · sorted by year

Program yearAmountRecords
PY2019 $14.55 1
PY2020 $18.57 1
PY2023 $206.43 6
PY2024 $306.44 15

Payment records · PY2024 (15)

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

Program year 2024 201920202023 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
AstraZeneca Pharmaceuticals LP $18.13 06/20/2024 Food and Beverage Undisputed 01/23/2026 1105624409 CMS
AstraZeneca Pharmaceuticals LP $13.88 07/20/2024 Food and Beverage Undisputed 01/23/2026 1105823221 CMS
AstraZeneca Pharmaceuticals LP $22.02 09/11/2024 Food and Beverage Undisputed 01/23/2026 1105393418 CMS
AstraZeneca Pharmaceuticals LP $32.41 10/18/2024 Food and Beverage Undisputed 01/23/2026 1105298357 CMS
Boehringer Ingelheim Pharmaceuticals, Inc. $14.98 07/17/2024 Food and Beverage Undisputed 01/23/2026 1118199808 CMS
Boehringer Ingelheim Pharmaceuticals, Inc. $16.39 10/16/2024 Food and Beverage Undisputed 01/23/2026 1118199812 CMS
Boehringer Ingelheim Pharmaceuticals, Inc. $22.08 11/05/2024 Food and Beverage Undisputed 01/23/2026 1118199816 CMS
GlaxoSmithKline, LLC. $17.94 08/01/2024 Food and Beverage Undisputed 01/23/2026 1116681143 CMS
Merck Sharp & Dohme LLC $15.83 01/31/2024 Food and Beverage Undisputed 01/23/2026 1141930747 CMS
Novo Nordisk Inc $22.70 05/31/2024 Food and Beverage Undisputed 01/23/2026 1096613110 CMS
Novo Nordisk Inc $16.64 07/09/2024 Food and Beverage Undisputed 01/23/2026 1096842851 CMS
Novo Nordisk Inc $24.73 08/28/2024 Food and Beverage Undisputed 01/23/2026 1096593804 CMS
Novo Nordisk Inc $18.89 10/22/2024 Food and Beverage Undisputed 01/23/2026 1097791756 CMS
Novo Nordisk Inc $30.03 11/07/2024 Food and Beverage Undisputed 01/23/2026 1096622414 CMS
SANOFI PASTEUR INC. $19.79 10/03/2024 Food and Beverage Undisputed 01/23/2026 1128741838 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, 2023, 2024
Source files
Dataset page · Bulk file · PY2019 , PY2020 , PY2023 , PY2024
Generated from
OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv

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