Healthcare provider profile · identity verified

Aaron C. Williams, MD

Internal Medicine · SANTA CLARA, CA · NPI 1982783627

Profile state: partd only Open Payments: 2025 Medicare Part D: 2024 Last identity check: 2026-08-10 Page data build: 2026-08-12

Verified facts

What the public records show

We did not find matching Open Payments records for this doctor in 2025.

These records do not establish that a payment influenced prescribing or medical care.

Payment overview · 2025

General Payments

We did not find matching Open Payments records for this doctor in the selected program year.

Separate record types

Research & Ownership

Research Payments (direct recipient): not present in the loaded data

Associated Research Funding (for example, named PI): not present in the loaded data

Ownership / Investment: not present in the loaded data

These categories are never added into the General Payments headline. Associated research funding must not be described as money the doctor personally received unless the source record supports that conclusion.

Analysis 1 · Payment-linked products

Products named in Open Payments records

No payment-linked product analysis is available because no matching General Payment records were found for the selected year.

Public prescribing for products named in payments

There is no explicit payment-product set available for a Part D comparison.

The presence of the same drug in both datasets does not show that a payment caused or influenced a prescription.

Analysis 2 · Same-company prescribing overlap

Drugs reported in other payments from the same company that also appear in Medicare Part D

This analysis is independent from products named on this doctor’s individual payment records. A row appears only when the exact Open Payments reporting entity paid this doctor, that same reporting entity reported the drug or biological on at least 10 loaded General Payment records involving at least 2 distinct recipient NPIs, and this doctor has the same non-generic brand in public Part D data. This does not mean the company owns or manufactures the drug.

There is no payer-company set available for this comparison.

These facts do not show that a payment was for the drug, that the company owns or manufactures the drug, or that a payment caused or influenced prescribing.

Public Medicare Part D data

Provider-and-drug rows loaded for 2024

Brand	Generic	Claims	Beneficiaries
Atorvastatin Calcium	Atorvastatin Calcium	421	138
Amlodipine Besylate	Amlodipine Besylate	356	123
Losartan Potassium	Losartan Potassium	235	77
Lisinopril	Lisinopril	221	75
Levothyroxine Sodium	Levothyroxine Sodium	170	51
Hydrochlorothiazide	Hydrochlorothiazide	167	61
Tamsulosin Hcl	Tamsulosin Hcl	165	53
Simvastatin	Simvastatin	140	45
Metformin Hcl	Metformin Hcl	128	45
Atenolol	Atenolol	124	40
Metformin Hcl Er	Metformin Hcl	121	43
Glipizide	Glipizide	94	31
Alendronate Sodium	Alendronate Sodium	86	26
Furosemide	Furosemide	86	33
Gabapentin	Gabapentin	82	32
Jardiance	Empagliflozin	82	27
Chlorthalidone	Chlorthalidone	77	29
Omeprazole	Omeprazole	77	31
Fluticasone Propionate	Fluticasone Propionate	75	27
Allopurinol	Allopurinol	72	26
Albuterol Sulfate Hfa	Albuterol Sulfate	70	34
Lovastatin	Lovastatin	66	23
Metoprolol Tartrate	Metoprolol Tartrate	66	23
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	62	21
Naproxen	Naproxen	59	29
Metoprolol Succinate	Metoprolol Succinate	55	25
Alvesco	Ciclesonide	49	14
Famotidine	Famotidine	46	19
Terazosin Hcl	Terazosin Hcl	46	14
Pradaxa	Dabigatran Etexilate Mesylate	44	16
Spironolactone	Spironolactone	44	15
Ozempic	Semaglutide	43	suppressed
Pravastatin Sodium	Pravastatin Sodium	43	16
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	41	suppressed
Pantoprazole Sodium	Pantoprazole Sodium	40	16
Baclofen	Baclofen	39	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	39	20
Meloxicam	Meloxicam	38	14
Potassium Chloride	Potassium Chloride	36	12
Tramadol Hcl	Tramadol Hcl	36	suppressed
Duloxetine Hcl	Duloxetine Hcl	35	12
Glipizide Er	Glipizide	33	14
Trazodone Hcl	Trazodone Hcl	33	13
Lorazepam	Lorazepam	32	12
Spiriva Respimat	Tiotropium Bromide	29	suppressed
Humulin N	Insulin Nph Human Isophane	28	11
Tizanidine Hcl	Tizanidine Hcl	28	18
Sertraline Hcl	Sertraline Hcl	27	suppressed
Citalopram Hbr	Citalopram Hydrobromide	26	suppressed
Rosuvastatin Calcium	Rosuvastatin Calcium	26	11
Cefadroxil	Cefadroxil	25	18
Zolpidem Tartrate	Zolpidem Tartrate	25	suppressed
Clobetasol Propionate	Clobetasol Propionate	24	14
Lactulose	Lactulose	24	11
Acyclovir	Acyclovir	22	suppressed
Clopidogrel	Clopidogrel Bisulfate	22	suppressed
Colchicine	Colchicine	22	suppressed
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	20	20
Ciclopirox	Ciclopirox	19	suppressed
Fluocinonide	Fluocinonide	19	12
Ibuprofen	Ibuprofen	19	suppressed
Veo Insulin Syringe	Syringe-Needle,insulin,0.5 Ml	19	suppressed
Warfarin Sodium	Warfarin Sodium	19	suppressed
Amoxicillin	Amoxicillin	18	12
Finasteride	Finasteride	18	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	17	suppressed
Propranolol Hcl	Propranolol Hcl	17	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	17	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	16	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	16	13
Eliquis	Apixaban	16	suppressed
Azelastine Hcl	Azelastine Hcl	15	suppressed
Ipratropium Bromide	Ipratropium Bromide	15	suppressed
Stiolto Respimat	Tiotropium Br/Olodaterol Hcl	15	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	15	suppressed
Xarelto	Rivaroxaban	15	suppressed
Ezetimibe	Ezetimibe	14	suppressed
Topiramate	Topiramate	14	suppressed
Breyna	Budesonide/Formoterol Fumarate	13	suppressed
Nabumetone	Nabumetone	13	suppressed
Humulin R	Insulin Regular, Human	12	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	12	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	11	suppressed
Montelukast Sodium	Montelukast Sodium	11	suppressed
Prednisone	Prednisone	11	11

Timeline

Payment and prescribing data by year

Open Payments and Medicare Part D may refer to different years. They are shown separately rather than aligned as if they describe the same period.

Year	General Payments	Main payer	Explicit products	Company overlaps	Part D coverage
2025	—	—	—	—	—
2024	—	—	—	—	Complete

Questions to ask

Questions you could discuss with your doctor

Are there reasonable alternatives I should understand when we discuss treatment options?
How should I interpret the industry-payment records shown here in the context of my care?

These are general questions generated from reviewed templates. They are not personalized medical advice.

Sources and limitations

How to read this page

Payment and Medicare prescribing data can cover different years; every comparison shows both years explicitly.
Part D does not represent a doctor’s entire practice; it excludes many patients and is subject to CMS public-release thresholds.
Company–drug relationships must have an auditable source, a precise relationship type, and a valid evidence period. Unresolved mappings are not published.
Generic drug claims are not attributed to a specific manufacturer without manufacturer-level evidence.
When a source extract is incomplete, missing rows are never treated as proof of no payments or no prescriptions.

Loaded source releases

Dataset	Year	Publication	Source
CMS Open Payments — General Payments	2025	2026-06-30	Original source
Medicare Part D Prescribers by Provider and Drug	2024	2026-05-06	Original source
NPPES Data Dissemination V2	current / reference data	2026-08-10	Original source

Methodology version: 2.1

Editorial template version: 2.4

Product contract version: 2.0

Schema version: 0.7.0

Page data build: 2026-08-12T23:34:59.370714+00:00

Publication policy: eligible for indexing after public-launch controls are enabled

Full methodology · Questions & answers · Report a possible error