LEON W KAO

Allopathic & Osteopathic Physicians|Allergy & Immunology|Allergy GERMANTOWN, MD NPI 1265639728

General Payments — all program years on this page

$6,548.11

Category: General Payments
Program years: PY2018–2024
Record count: 320
As of (CMS publication): 2026-01-23

Latest program year (PY2024): $1,689.30 across 64 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	$1,672.76	63
Education	$16.54	1

By paying entity

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

Paying entity	Amount	Records
Regeneron Healthcare Solutions, Inc.	$417.09	15
GENZYME CORPORATION	$331.21	7
Acerta Pharma LLC	$212.64	10
GlaxoSmithKline, LLC.	$201.48	9
Genentech USA, Inc.	$90.72	3
Takeda Pharmaceuticals U.S.A., Inc.	$82.56	3
Amgen Inc.	$76.40	3
Grifols USA, LLC	$72.03	4
OptiNose US, Inc.	$61.89	3
Invivyd Inc	$31.10	1
NOVARTIS PHARMACEUTICALS CORPORATION	$31.02	2
Phadia US Inc.	$23.70	1
BioCryst US Sales Co., LLC	$22.52	1
Dermavant Sciences, Inc.	$19.63	1
PFIZER INC.	$15.31	1

By program year

Program year	Amount	Records
2018	$512.07	24
2019	$588.51	30
2020	$637.18	39
2021	$828.46	49
2022	$1,123.60	59
2023	$1,168.99	55
2024	$1,689.30	64

Records — PY2024 (64)

Record ID	Paying entity	Amount	Date	Nature of payment	Dispute status	Published	Source
1067582216	Phadia US Inc.	$23.70	02/22/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1087096838	Novartis Pharmaceuticals Corporation	$15.02	02/15/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1087096842	Novartis Pharmaceuticals Corporation	$16.00	03/15/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104217365	AstraZeneca Pharmaceuticals LP	$17.87	04/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104379717	AstraZeneca Pharmaceuticals LP	$28.18	04/20/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104433071	AstraZeneca Pharmaceuticals LP	$32.65	02/10/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104500180	AstraZeneca Pharmaceuticals LP	$19.36	11/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104560924	AstraZeneca Pharmaceuticals LP	$14.82	04/24/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1104775806	AstraZeneca Pharmaceuticals LP	$21.82	09/26/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105363610	AstraZeneca Pharmaceuticals LP	$16.93	03/14/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105528504	AstraZeneca Pharmaceuticals LP	$17.16	02/09/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105541547	AstraZeneca Pharmaceuticals LP	$19.93	06/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1105688609	AstraZeneca Pharmaceuticals LP	$23.92	09/07/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1111614229	Amgen Inc.	$25.76	01/17/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1111614231	Amgen Inc.	$28.44	06/21/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1111614233	Amgen Inc.	$22.20	11/15/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081927	Regeneron Healthcare Solutions, Inc.	$18.33	01/11/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081929	Regeneron Healthcare Solutions, Inc.	$23.66	02/29/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081931	Regeneron Healthcare Solutions, Inc.	$30.38	04/11/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081933	Regeneron Healthcare Solutions, Inc.	$30.41	05/24/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081935	Regeneron Healthcare Solutions, Inc.	$25.12	05/29/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081937	Regeneron Healthcare Solutions, Inc.	$16.54	05/30/2024	Education	Undisputed	01/23/2026	View at CMS
1114081939	Regeneron Healthcare Solutions, Inc.	$31.25	06/27/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081941	Regeneron Healthcare Solutions, Inc.	$19.98	08/01/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081943	Regeneron Healthcare Solutions, Inc.	$36.89	08/28/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081945	Regeneron Healthcare Solutions, Inc.	$31.02	09/20/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081947	Regeneron Healthcare Solutions, Inc.	$24.63	10/17/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081949	Regeneron Healthcare Solutions, Inc.	$37.88	10/25/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081951	Regeneron Healthcare Solutions, Inc.	$36.77	11/13/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081953	Regeneron Healthcare Solutions, Inc.	$28.20	12/04/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1114081955	Regeneron Healthcare Solutions, Inc.	$26.03	12/18/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1115786138	GlaxoSmithKline, LLC.	$18.70	06/11/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116043396	GlaxoSmithKline, LLC.	$22.39	10/31/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116284105	GlaxoSmithKline, LLC.	$18.07	07/26/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116311145	GlaxoSmithKline, LLC.	$13.99	04/30/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116406077	GlaxoSmithKline, LLC.	$22.87	01/08/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116475040	GlaxoSmithKline, LLC.	$30.47	07/11/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116575148	GlaxoSmithKline, LLC.	$24.39	05/15/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116587021	GlaxoSmithKline, LLC.	$31.00	03/01/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1116729186	GlaxoSmithKline, LLC.	$19.60	04/03/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1117481568	BioCryst US Sales Co., LLC	$22.52	06/14/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124728431	Grifols USA, LLC	$16.80	06/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124728433	Grifols USA, LLC	$16.32	07/19/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124728435	Grifols USA, LLC	$16.09	04/11/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1124728437	Grifols USA, LLC	$22.82	03/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1127886354	Dermavant Sciences, Inc.	$19.63	11/21/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1131285491	PFIZER INC.	$15.31	03/14/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1133053393	Genentech USA, Inc.	$29.88	03/21/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1133053398	Genentech USA, Inc.	$28.60	04/19/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1133053402	Genentech USA, Inc.	$32.24	10/09/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1137594836	Takeda Pharmaceuticals U.S.A., Inc.	$25.39	01/31/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1137594840	Takeda Pharmaceuticals U.S.A., Inc.	$27.86	05/22/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1137594843	Takeda Pharmaceuticals U.S.A., Inc.	$29.31	11/14/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820097	GENZYME CORPORATION	$34.22	02/01/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820133	GENZYME CORPORATION	$25.87	05/01/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820153	GENZYME CORPORATION	$30.18	07/12/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820157	GENZYME CORPORATION	$88.46	02/24/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820159	GENZYME CORPORATION	$87.34	06/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820173	GENZYME CORPORATION	$32.47	09/20/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1139820193	GENZYME CORPORATION	$32.67	10/31/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1142182002	Optinose US, Inc.	$26.09	04/26/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1142182116	Optinose US, Inc.	$14.35	10/23/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1142182136	Optinose US, Inc.	$21.45	12/06/2024	Food and Beverage	Undisputed	01/23/2026	View at CMS
1147384378	Invivyd Inc	$31.10	10/04/2024	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.