Covered recipient · General Payments record

SING CHAN

Allopathic & Osteopathic Physicians Internal Medicine Gastroenterology

NPI: 1225053523
CMS profile: 237207
Location: FLUSHING, NY

General Payments · PY2018–2024

$8,606.59

Reported across 445 records
CMS publication 2026-01-23

Latest program year · PY2024

$1,992.65

102 records · 5 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 payment	Amount	Records
Food and Beverage	$1,975.63	101
Education	$17.02	1

By paying entity

PY2024 · sorted by reported total

Paying entity	Amount	Records
Gilead Sciences, Inc.	$449.81	20
Ardelyx, Inc.	$281.40	11
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$271.57	14
PFIZER INC.	$193.91	9
INTRA-SANA LABORATORIES	$166.46	11
ABBVIE INC.	$160.50	16
Phathom Pharmaceuticals, Inc.	$77.22	3
Janssen Biotech, Inc.	$74.23	3
Takeda Pharmaceuticals U.S.A., Inc.	$71.27	3
Celgene Corporation	$68.91	3
Celltrion USA Inc.	$42.44	2
AIMMUNE THERAPEUTICS, INC.	$40.05	2
IRONWOOD PHARMACEUTICALS, INC	$30.75	2
QOL Medical, LLC	$22.99	1
RedHill Biopharma Inc.	$22.20	1
Lilly USA, LLC	$18.94	1

By program year

All program years on this page · sorted by year

Program year	Amount	Records
PY2018	$793.16	44
PY2019	$862.17	52
PY2020	$552.15	29
PY2021	$1,168.33	61
PY2022	$1,367.02	62
PY2023	$1,871.11	95
PY2024	$1,992.65	102

Payment records · PY2024 (102)

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

Program year 2024 2018 2019 2020 2021 2022 2023 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
ABBVIE INC.	$12.37	01/19/2024	Food and Beverage	Undisputed	01/23/2026	1103438296	CMS
ABBVIE INC.	$13.68	02/16/2024	Food and Beverage	Undisputed	01/23/2026	1103438298	CMS
ABBVIE INC.	$15.29	03/15/2024	Food and Beverage	Undisputed	01/23/2026	1103438300	CMS
ABBVIE INC.	$3.33	04/12/2024	Food and Beverage	Undisputed	01/23/2026	1103438302	CMS
ABBVIE INC.	$15.35	05/10/2024	Food and Beverage	Undisputed	01/23/2026	1103438304	CMS
ABBVIE INC.	$4.13	06/07/2024	Food and Beverage	Undisputed	01/23/2026	1103438306	CMS
ABBVIE INC.	$12.35	06/21/2024	Food and Beverage	Undisputed	01/23/2026	1103438308	CMS
ABBVIE INC.	$0.51	06/21/2024	Food and Beverage	Undisputed	01/23/2026	1103438310	CMS
ABBVIE INC.	$1.50	06/21/2024	Food and Beverage	Undisputed	01/23/2026	1103438312	CMS
ABBVIE INC.	$8.15	07/11/2024	Food and Beverage	Undisputed	01/23/2026	1103438314	CMS
ABBVIE INC.	$1.90	07/19/2024	Food and Beverage	Undisputed	01/23/2026	1103438316	CMS
ABBVIE INC.	$19.89	07/19/2024	Food and Beverage	Undisputed	01/23/2026	1103438318	CMS
ABBVIE INC.	$12.34	09/27/2024	Food and Beverage	Undisputed	01/23/2026	1103438320	CMS
ABBVIE INC.	$10.63	10/25/2024	Food and Beverage	Undisputed	01/23/2026	1103438322	CMS
ABBVIE INC.	$16.71	11/22/2024	Food and Beverage	Undisputed	01/23/2026	1103438324	CMS
ABBVIE INC.	$12.37	12/08/2024	Food and Beverage	Disputed	01/23/2026	1103438326	CMS
AIMMUNE THERAPEUTICS, INC.	$17.53	01/03/2024	Food and Beverage	Disputed	01/23/2026	1147020723	CMS
AIMMUNE THERAPEUTICS, INC.	$22.52	10/31/2024	Food and Beverage	Undisputed	01/23/2026	1147010736	CMS
Ardelyx, Inc.	$22.94	01/05/2024	Food and Beverage	Undisputed	01/23/2026	1146674462	CMS
Ardelyx, Inc.	$13.91	02/02/2024	Food and Beverage	Undisputed	01/23/2026	1146674464	CMS
Ardelyx, Inc.	$23.23	03/08/2024	Food and Beverage	Undisputed	01/23/2026	1146674466	CMS
Ardelyx, Inc.	$20.94	04/05/2024	Food and Beverage	Undisputed	01/23/2026	1146674468	CMS
Ardelyx, Inc.	$23.75	05/04/2024	Food and Beverage	Undisputed	01/23/2026	1146674470	CMS
Ardelyx, Inc.	$30.13	06/06/2024	Food and Beverage	Undisputed	01/23/2026	1146674472	CMS
Ardelyx, Inc.	$33.26	07/11/2024	Food and Beverage	Undisputed	01/23/2026	1146674474	CMS
Ardelyx, Inc.	$28.53	08/09/2024	Food and Beverage	Undisputed	01/23/2026	1146674476	CMS
Ardelyx, Inc.	$24.92	09/20/2024	Food and Beverage	Undisputed	01/23/2026	1146674478	CMS
Ardelyx, Inc.	$29.55	11/15/2024	Food and Beverage	Undisputed	01/23/2026	1146674480	CMS
Ardelyx, Inc.	$30.24	12/13/2024	Food and Beverage	Undisputed	01/23/2026	1146674482	CMS
Celgene Corporation	$21.43	02/07/2024	Food and Beverage	Undisputed	01/23/2026	1101138386	CMS
Celgene Corporation	$24.18	03/11/2024	Food and Beverage	Undisputed	01/23/2026	1101138394	CMS
Celgene Corporation	$23.30	07/11/2024	Food and Beverage	Undisputed	01/23/2026	1101138408	CMS
Celltrion USA Inc.	$17.02	03/01/2024	Education	Undisputed	01/23/2026	1075849445	CMS
Celltrion USA Inc.	$25.42	08/21/2024	Food and Beverage	Undisputed	01/23/2026	1075849447	CMS
Gilead Sciences, Inc.	$23.94	01/31/2024	Food and Beverage	Undisputed	01/23/2026	1133774415	CMS
Gilead Sciences, Inc.	$25.20	02/21/2024	Food and Beverage	Undisputed	01/23/2026	1133774417	CMS
Gilead Sciences, Inc.	$22.80	03/06/2024	Food and Beverage	Undisputed	01/23/2026	1133774419	CMS
Gilead Sciences, Inc.	$24.61	03/20/2024	Food and Beverage	Undisputed	01/23/2026	1133774421	CMS
Gilead Sciences, Inc.	$6.79	03/28/2024	Food and Beverage	Undisputed	01/23/2026	1133774423	CMS
Gilead Sciences, Inc.	$24.68	04/03/2024	Food and Beverage	Undisputed	01/23/2026	1133774425	CMS
Gilead Sciences, Inc.	$26.42	04/17/2024	Food and Beverage	Undisputed	01/23/2026	1133774427	CMS
Gilead Sciences, Inc.	$23.06	05/15/2024	Food and Beverage	Undisputed	01/23/2026	1133774429	CMS
Gilead Sciences, Inc.	$25.29	05/29/2024	Food and Beverage	Undisputed	01/23/2026	1133774431	CMS
Gilead Sciences, Inc.	$24.76	06/12/2024	Food and Beverage	Undisputed	01/23/2026	1133774433	CMS
Gilead Sciences, Inc.	$18.82	06/26/2024	Food and Beverage	Undisputed	01/23/2026	1133774435	CMS
Gilead Sciences, Inc.	$26.07	07/24/2024	Food and Beverage	Undisputed	01/23/2026	1133774437	CMS
Gilead Sciences, Inc.	$23.61	08/07/2024	Food and Beverage	Undisputed	01/23/2026	1133774439	CMS
Gilead Sciences, Inc.	$25.71	08/14/2024	Food and Beverage	Undisputed	01/23/2026	1133774441	CMS
Gilead Sciences, Inc.	$22.66	09/11/2024	Food and Beverage	Undisputed	01/23/2026	1133774443	CMS
Gilead Sciences, Inc.	$20.71	09/18/2024	Food and Beverage	Undisputed	01/23/2026	1133774445	CMS
Gilead Sciences, Inc.	$8.91	09/25/2024	Food and Beverage	Undisputed	01/23/2026	1133774447	CMS
Gilead Sciences, Inc.	$23.67	10/30/2024	Food and Beverage	Undisputed	01/23/2026	1133774449	CMS
Gilead Sciences, Inc.	$25.20	11/13/2024	Food and Beverage	Undisputed	01/23/2026	1133774451	CMS
Gilead Sciences, Inc.	$26.90	12/11/2024	Food and Beverage	Undisputed	01/23/2026	1133774453	CMS
Intra-Sana Laboratories	$16.56	01/10/2024	Food and Beverage	Undisputed	01/23/2026	1138617427	CMS
Intra-Sana Laboratories	$26.64	01/17/2024	Food and Beverage	Undisputed	01/23/2026	1138617429	CMS
Intra-Sana Laboratories	$27.53	02/14/2024	Food and Beverage	Undisputed	01/23/2026	1138617431	CMS
Intra-Sana Laboratories	$14.06	03/18/2024	Food and Beverage	Undisputed	01/23/2026	1138617433	CMS
Intra-Sana Laboratories	$24.41	05/24/2024	Food and Beverage	Undisputed	01/23/2026	1138617435	CMS
Intra-Sana Laboratories	$6.08	06/10/2024	Food and Beverage	Undisputed	01/23/2026	1138617437	CMS
Intra-Sana Laboratories	$6.64	07/30/2024	Food and Beverage	Undisputed	01/23/2026	1138617439	CMS
Intra-Sana Laboratories	$25.41	08/16/2024	Food and Beverage	Undisputed	01/23/2026	1138617441	CMS
Intra-Sana Laboratories	$4.79	09/13/2024	Food and Beverage	Undisputed	01/23/2026	1138617443	CMS
Intra-Sana Laboratories	$9.04	10/01/2024	Food and Beverage	Undisputed	01/23/2026	1138617445	CMS
Intra-Sana Laboratories	$5.30	11/21/2024	Food and Beverage	Undisputed	01/23/2026	1138617447	CMS
IRONWOOD PHARMACEUTICALS, INC	$17.49	04/12/2024	Food and Beverage	Undisputed	01/23/2026	1153770434	CMS
IRONWOOD PHARMACEUTICALS, INC	$13.26	12/20/2024	Food and Beverage	Undisputed	01/23/2026	1153730947	CMS
Janssen Biotech, Inc.	$27.68	07/17/2024	Food and Beverage	Undisputed	01/23/2026	1078424631	CMS
Janssen Biotech, Inc.	$23.92	10/02/2024	Food and Beverage	Undisputed	01/23/2026	1078424953	CMS
Janssen Biotech, Inc.	$22.63	12/18/2024	Food and Beverage	Undisputed	01/23/2026	1078425140	CMS
Lilly USA, LLC	$18.94	06/20/2024	Food and Beverage	Undisputed	01/23/2026	1135411783	CMS
PFIZER INC.	$29.83	01/25/2024	Food and Beverage	Undisputed	01/23/2026	1131128208	CMS
PFIZER INC.	$27.55	03/28/2024	Food and Beverage	Undisputed	01/23/2026	1131366446	CMS
PFIZER INC.	$25.57	05/01/2024	Food and Beverage	Undisputed	01/23/2026	1131462498	CMS
PFIZER INC.	$24.06	07/31/2024	Food and Beverage	Undisputed	01/23/2026	1131847741	CMS
PFIZER INC.	$22.46	09/04/2024	Food and Beverage	Undisputed	01/23/2026	1131967377	CMS
PFIZER INC.	$7.87	09/19/2024	Food and Beverage	Undisputed	01/23/2026	1131950268	CMS
PFIZER INC.	$24.61	10/09/2024	Food and Beverage	Undisputed	01/23/2026	1132108967	CMS
PFIZER INC.	$5.54	11/05/2024	Food and Beverage	Undisputed	01/23/2026	1131148138	CMS
PFIZER INC.	$26.42	12/04/2024	Food and Beverage	Undisputed	01/23/2026	1131029738	CMS
Phathom Pharmaceuticals, Inc.	$23.88	02/28/2024	Food and Beverage	Undisputed	01/23/2026	1151047558	CMS
Phathom Pharmaceuticals, Inc.	$29.12	05/22/2024	Food and Beverage	Undisputed	01/23/2026	1151047560	CMS
Phathom Pharmaceuticals, Inc.	$24.22	08/28/2024	Food and Beverage	Undisputed	01/23/2026	1151047562	CMS
QOL Medical, LLC	$22.99	08/02/2024	Food and Beverage	Undisputed	01/23/2026	1147715919	CMS
RedHill Biopharma Inc.	$22.20	01/03/2024	Food and Beverage	Undisputed	01/23/2026	1095478189	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$24.30	01/09/2024	Food and Beverage	Undisputed	01/23/2026	1153589662	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$21.47	01/17/2024	Food and Beverage	Disputed	01/23/2026	1153748112	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$20.79	01/24/2024	Food and Beverage	Undisputed	01/23/2026	1153665476	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$21.91	02/21/2024	Food and Beverage	Undisputed	01/23/2026	1153433285	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$18.64	03/06/2024	Food and Beverage	Disputed	01/23/2026	1153568104	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$1.80	03/06/2024	Food and Beverage	Undisputed	01/23/2026	1153651786	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$1.84	05/30/2024	Food and Beverage	Undisputed	01/23/2026	1153573222	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$22.14	05/30/2024	Food and Beverage	Undisputed	01/23/2026	1153683753	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$20.59	06/11/2024	Food and Beverage	Undisputed	01/23/2026	1153693838	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$25.05	08/14/2024	Food and Beverage	Disputed	01/23/2026	1153461886	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$29.37	09/11/2024	Food and Beverage	Undisputed	01/23/2026	1153601941	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$18.89	10/31/2024	Food and Beverage	Undisputed	01/23/2026	1153554217	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$24.83	12/02/2024	Food and Beverage	Undisputed	01/23/2026	1153657109	CMS
Salix Pharmaceuticals, a division of Bausch Health US, LLC	$19.95	12/23/2024	Food and Beverage	Undisputed	01/23/2026	1153679540	CMS
Takeda Pharmaceuticals U.S.A., Inc.	$23.70	03/04/2024	Food and Beverage	Undisputed	01/23/2026	1137506523	CMS
Takeda Pharmaceuticals U.S.A., Inc.	$23.38	05/16/2024	Food and Beverage	Undisputed	01/23/2026	1137506527	CMS
Takeda Pharmaceuticals U.S.A., Inc.	$24.19	06/05/2024	Food and Beverage	Undisputed	01/23/2026	1137506531	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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