Healthcare provider profile · identity verified

Mark S Sullivan, M.D.

Family Practice · FAIRFIELD, CA · NPI 1871673723

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
Amlodipine Besylate	Amlodipine Besylate	458	121
Atorvastatin Calcium	Atorvastatin Calcium	442	114
Rosuvastatin Calcium	Rosuvastatin Calcium	247	62
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	225	42
Omeprazole	Omeprazole	206	55
Jardiance	Empagliflozin	189	44
Metformin Hcl Er	Metformin Hcl	180	53
Metoprolol Succinate	Metoprolol Succinate	174	49
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	148	41
Lisinopril	Lisinopril	146	36
Losartan Potassium	Losartan Potassium	143	40
Pioglitazone Hcl	Pioglitazone Hcl	134	33
Naproxen	Naproxen	131	48
Alendronate Sodium	Alendronate Sodium	127	26
Metformin Hcl	Metformin Hcl	126	31
Levothyroxine Sodium	Levothyroxine Sodium	123	31
Pantoprazole Sodium	Pantoprazole Sodium	110	29
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	108	27
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	106	24
Allopurinol	Allopurinol	105	27
Gabapentin	Gabapentin	102	24
Lorazepam	Lorazepam	102	21
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	97	12
Potassium Chloride	Potassium Chloride	97	26
Zolpidem Tartrate	Zolpidem Tartrate	95	19
Carvedilol	Carvedilol	90	23
Fluticasone Propionate	Fluticasone Propionate	87	35
Tamsulosin Hcl	Tamsulosin Hcl	87	20
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	86	22
Famotidine	Famotidine	83	19
Albuterol Sulfate Hfa	Albuterol Sulfate	82	37
Simvastatin	Simvastatin	75	24
Trulicity	Dulaglutide	72	12
Hydrochlorothiazide	Hydrochlorothiazide	70	20
Valsartan	Valsartan	69	16
Pregabalin	Pregabalin	67	suppressed
Celecoxib	Celecoxib	63	17
Ibuprofen	Ibuprofen	63	25
Clopidogrel	Clopidogrel Bisulfate	62	16
Tramadol Hcl	Tramadol Hcl	62	22
Trazodone Hcl	Trazodone Hcl	61	20
Alprazolam	Alprazolam	60	11
Spironolactone	Spironolactone	58	16
Atenolol	Atenolol	55	15
Finasteride	Finasteride	53	14
Sertraline Hcl	Sertraline Hcl	53	15
Amlodipine-Valsartan	Amlodipine Besylate/Valsartan	52	14
Bumetanide	Bumetanide	51	13
Triamcinolone Acetonide	Triamcinolone Acetonide	50	29
Eliquis	Apixaban	45	suppressed
Januvia	Sitagliptin Phosphate	45	16
Terazosin Hcl	Terazosin Hcl	44	13
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	43	11
Lovastatin	Lovastatin	43	suppressed
Clonidine Hcl	Clonidine Hcl	40	12
Diclofenac Sodium	Diclofenac Sodium	40	15
Paroxetine Hcl	Paroxetine Hcl	40	suppressed
Morphine Sulfate Er	Morphine Sulfate	38	suppressed
Ozempic	Semaglutide	38	11
Quetiapine Fumarate	Quetiapine Fumarate	37	suppressed
Xarelto	Rivaroxaban	37	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	36	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	36	11
Estradiol	Estradiol	36	11
Olmesartan Medoxomil	Olmesartan Medoxomil	36	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	35	11
Montelukast Sodium	Montelukast Sodium	35	11
Fluoxetine Hcl	Fluoxetine Hcl	33	suppressed
Nifedipine Er	Nifedipine	32	suppressed
Ondansetron Hcl	Ondansetron Hcl	31	12
Pravastatin Sodium	Pravastatin Sodium	31	suppressed
Temazepam	Temazepam	31	suppressed
Citalopram Hbr	Citalopram Hydrobromide	30	suppressed
Risperidone	Risperidone	30	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	29	suppressed
Furosemide	Furosemide	29	12
Metoprolol Tartrate	Metoprolol Tartrate	28	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	28	suppressed
Mounjaro	Tirzepatide	27	suppressed
Clonazepam	Clonazepam	26	suppressed
Duloxetine Hcl	Duloxetine Hcl	25	suppressed
Meloxicam	Meloxicam	25	suppressed
Benazepril Hcl	Benazepril Hcl	24	suppressed
Chlorthalidone	Chlorthalidone	24	suppressed
Bupropion Xl	Bupropion Hcl	23	suppressed
Valacyclovir	Valacyclovir Hcl	23	suppressed
Mirtazapine	Mirtazapine	22	suppressed
Prednisone	Prednisone	22	14
Venlafaxine Hcl Er	Venlafaxine Hcl	21	suppressed
Warfarin Sodium	Warfarin Sodium	21	suppressed
Ropinirole Hcl	Ropinirole Hcl	20	suppressed
Ventolin Hfa	Albuterol Sulfate	20	suppressed
Felodipine Er	Felodipine	19	suppressed
Ipratropium Bromide	Ipratropium Bromide	19	suppressed
Topiramate	Topiramate	19	suppressed
Diltiazem 24hr Er	Diltiazem Hcl	18	suppressed
Glipizide	Glipizide	18	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	17	suppressed
Irbesartan	Irbesartan	17	suppressed
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	17	suppressed
Divalproex Sodium	Divalproex Sodium	16	suppressed
Tizanidine Hcl	Tizanidine Hcl	16	suppressed
Tradjenta	Linagliptin	16	suppressed
Premarin	Estrogens, Conjugated	15	suppressed
Spiriva Respimat	Tiotropium Bromide	15	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	14	11
Colchicine	Colchicine	14	suppressed
Entresto	Sacubitril/Valsartan	14	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	14	suppressed
Midodrine Hcl	Midodrine Hcl	14	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	14	suppressed
Zolpidem Tartrate Er	Zolpidem Tartrate	14	suppressed
Bupropion Hcl Sr	Bupropion Hcl	13	suppressed
Donepezil Hcl	Donepezil Hcl	13	suppressed
Meclizine Hcl	Meclizine Hcl	13	suppressed
Nystatin	Nystatin	13	suppressed
Ramelteon	Ramelteon	13	suppressed
Tresiba Flextouch U-100	Insulin Degludec	13	suppressed
Acarbose	Acarbose	12	suppressed
Azithromycin	Azithromycin	12	11
Eszopiclone	Eszopiclone	12	suppressed
Lacosamide	Lacosamide	12	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	12	11
Oxycodone Hcl	Oxycodone Hcl	12	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	12	12
Symbicort	Budesonide/Formoterol Fumarate	12	suppressed
Fluocinonide	Fluocinonide	11	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	11	suppressed
Novolog Mix 70-30 Flexpen	Insulin Aspart Prot/Insuln Asp	11	suppressed
Rybelsus	Semaglutide	11	suppressed
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	11	suppressed

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