WARREN CHANG

Allopathic & Osteopathic Physicians|Internal Medicine|Nephrology DALY CITY, CA NPI 1083674550

General Payments — all program years on this page

$4,603.27

Category: General Payments
Program years: PY2018–2024
Record count: 209
As of (CMS publication): 2026-01-23

Latest program year (PY2024): $1,421.14 across 58 records · disputed records: 0

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

How this figure is 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

Latest program year (PY2024) · sorted by reported total.

Nature of payment	Amount	Records
Food and Beverage	$1,362.52	55
Education	$58.62	3

By paying entity

Latest program year (PY2024) · sorted by reported total.

Paying entity	Amount	Records
Acerta Pharma LLC	$258.31	11
Mallinckrodt Hospital Products Inc.	$168.69	6
NOVARTIS PHARMACEUTICALS CORPORATION	$123.71	4
CALLIDITAS THERAPEUTICS US INC.	$107.14	5
Amgen Inc.	$103.78	5
Novo Nordisk AS	$100.59	5
Otsuka America Pharmaceutical, Inc.	$75.49	3
Fresenius USA Marketing, Inc.	$68.31	3
Relypsa, Inc.	$65.20	2
OPKO Pharmaceuticals, LLC	$58.62	3
Otsuka Pharmaceutical Development & Commercialization, Inc.	$56.00	2
Aurinia Pharma U.S., Inc.	$52.53	2
Lilly USA, LLC	$49.21	2
Retrophin, Inc.	$35.21	1
Takeda Pharmaceuticals U.S.A., Inc.	$27.62	1
Ardelyx, Inc.	$26.28	1
Boehringer Ingelheim Pharmaceuticals, Inc.	$24.91	1
Janssen Pharmaceuticals, Inc	$19.54	1

By program year

Program year	Amount	Records
2018	$163.98	6
2019	$460.12	27
2020	$376.66	21
2021	$658.88	31
2022	$384.08	21
2023	$1,138.41	45
2024	$1,421.14	58

Records — PY2024 (58)

Record ID	Paying entity	Amount	Date	Nature of payment	Dispute status	Published	Source
1077922661	Janssen Pharmaceuticals, Inc	$19.54	04/27/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1086768475	Novartis Pharmaceuticals Corporation	$26.46	06/07/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1086768485	Novartis Pharmaceuticals Corporation	$30.94	08/30/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1086768487	Novartis Pharmaceuticals Corporation	$31.55	09/07/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1086768501	Novartis Pharmaceuticals Corporation	$34.76	11/05/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1096613242	Novo Nordisk Inc	$19.10	10/03/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1096688724	Novo Nordisk Inc	$20.56	06/29/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1097151495	Novo Nordisk Inc	$20.56	06/01/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1097514323	Novo Nordisk Inc	$19.10	10/24/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1097814863	Novo Nordisk Inc	$21.27	07/20/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104225117	AstraZeneca Pharmaceuticals LP	$28.35	11/08/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104231947	AstraZeneca Pharmaceuticals LP	$27.96	09/13/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104253823	AstraZeneca Pharmaceuticals LP	$21.83	04/19/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104301600	AstraZeneca Pharmaceuticals LP	$19.95	07/26/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104706021	AstraZeneca Pharmaceuticals LP	$28.93	01/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104742591	AstraZeneca Pharmaceuticals LP	$19.26	02/22/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105297161	AstraZeneca Pharmaceuticals LP	$21.35	08/29/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105617107	AstraZeneca Pharmaceuticals LP	$23.87	03/02/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105673435	AstraZeneca Pharmaceuticals LP	$14.46	01/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105736917	AstraZeneca Pharmaceuticals LP	$28.77	11/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105793738	AstraZeneca Pharmaceuticals LP	$23.58	05/03/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1112843340	OPKO Pharmaceuticals, LLC	$21.17	01/20/2024	Education	Undisputed	01/23/2026	View at CMS
1112843342	OPKO Pharmaceuticals, LLC	$18.58	02/03/2024	Education	Undisputed	01/23/2026	View at CMS
1112843344	OPKO Pharmaceuticals, LLC	$18.87	08/16/2024	Education	Undisputed	01/23/2026	View at CMS
1115491546	Amgen Inc.	$30.81	07/13/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1115491552	Amgen Inc.	$14.41	08/09/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1115491558	Amgen Inc.	$14.74	08/09/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1117524327	Amgen Inc.	$26.77	04/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1117524329	Amgen Inc.	$17.05	11/21/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1117866407	Boehringer Ingelheim Pharmaceuticals, Inc.	$24.91	08/22/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1118835905	Otsuka Pharmaceutical Development & Commercialization, Inc.	$29.44	01/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1118835907	Otsuka Pharmaceutical Development & Commercialization, Inc.	$26.56	05/16/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1118873478	Otsuka America Pharmaceutical, Inc.	$23.42	02/17/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1118873480	Otsuka America Pharmaceutical, Inc.	$29.15	07/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1118873482	Otsuka America Pharmaceutical, Inc.	$22.92	12/19/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124054444	Vifor Pharma, Inc.	$30.50	09/05/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124063078	Vifor Pharma, Inc.	$34.70	11/16/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1135452991	Lilly USA, LLC	$18.22	01/30/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1135480223	Lilly USA, LLC	$30.99	11/22/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1137507657	Takeda Pharmaceuticals U.S.A., Inc.	$27.62	01/30/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1141509943	CALLIDITAS THERAPEUTICS US INC.	$16.90	02/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1141512615	CALLIDITAS THERAPEUTICS US INC.	$32.74	03/30/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1141513589	CALLIDITAS THERAPEUTICS US INC.	$18.27	04/19/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1141519343	CALLIDITAS THERAPEUTICS US INC.	$14.26	07/26/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1141520515	CALLIDITAS THERAPEUTICS US INC.	$24.97	08/16/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056080	Mallinckrodt Hospital Products Inc.	$21.67	02/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056084	Mallinckrodt Hospital Products Inc.	$29.09	04/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056088	Mallinckrodt Hospital Products Inc.	$23.61	09/28/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056093	Mallinckrodt Hospital Products Inc.	$27.55	10/18/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056097	Mallinckrodt Hospital Products Inc.	$34.88	11/09/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1145056101	Mallinckrodt Hospital Products Inc.	$31.89	12/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1146674726	Ardelyx, Inc.	$26.28	05/18/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1149911194	Travere Therapeutics, Inc.	$35.21	12/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1150677763	Aurinia Pharma U.S., Inc.	$26.85	03/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1150677765	Aurinia Pharma U.S., Inc.	$25.68	03/16/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1154203368	Fresenius USA Marketing, Inc.	$21.39	07/18/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1154203370	Fresenius USA Marketing, Inc.	$22.32	10/10/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1154203372	Fresenius USA Marketing, Inc.	$24.60	01/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS

Provenance & corrections

Dataset: CMS Open Payments — General Payments
Source: CMS Open Payments dataset (bulk file)
Publisher of source data: Centers for Medicare & Medicaid Services
Generated from: OP_DTL_GNRL_PGYR2024_P01232026_01102026.csv

One page per canonical provider; split Profile_IDs are merged via Associated_Covered_Recipient_Profile_ID_1/_2 from the Covered Recipient Profile Supplement.

Corrections to the substance of a record route to CMS through its review-and-dispute process; errors in how this site mirrors or displays a record route to us. Both paths are described in Methodology & Data.