Healthcare provider profile · identity verified

Gregory Singleton, MD

Family Practice · ORANGEBURG, SC · NPI 1013953330

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	543	137
Atorvastatin Calcium	Atorvastatin Calcium	342	83
Hydrochlorothiazide	Hydrochlorothiazide	257	67
Omeprazole	Omeprazole	196	37
Rosuvastatin Calcium	Rosuvastatin Calcium	177	50
Metformin Hcl	Metformin Hcl	158	31
Doxazosin Mesylate	Doxazosin Mesylate	152	39
Fluticasone Propionate	Fluticasone Propionate	152	31
Metoprolol Succinate	Metoprolol Succinate	151	39
Montelukast Sodium	Montelukast Sodium	148	28
Levothyroxine Sodium	Levothyroxine Sodium	139	21
Famotidine	Famotidine	133	39
Meloxicam	Meloxicam	133	31
Tamsulosin Hcl	Tamsulosin Hcl	116	30
Alendronate Sodium	Alendronate Sodium	115	29
Furosemide	Furosemide	113	31
Potassium Chloride	Potassium Chloride	112	19
Lisinopril	Lisinopril	110	18
Simvastatin	Simvastatin	110	18
Pravastatin Sodium	Pravastatin Sodium	101	19
Gabapentin	Gabapentin	90	28
Pantoprazole Sodium	Pantoprazole Sodium	89	18
Metoprolol Tartrate	Metoprolol Tartrate	87	17
Amlodipine-Valsartan	Amlodipine Besylate/Valsartan	86	21
Janumet Xr	Sitagliptin Phos/Metformin Hcl	84	suppressed
Azithromycin	Azithromycin	81	72
Valsartan	Valsartan	80	22
Clonidine Hcl	Clonidine Hcl	78	15
Albuterol Sulfate Hfa	Albuterol Sulfate	76	16
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	75	20
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	71	14
Diclofenac Sodium	Diclofenac Sodium	68	15
Eliquis	Apixaban	66	12
Alprazolam	Alprazolam	65	12
Losartan Potassium	Losartan Potassium	65	14
Ozempic	Semaglutide	57	suppressed
Spironolactone	Spironolactone	52	15
Celecoxib	Celecoxib	51	13
Lamotrigine	Lamotrigine	50	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	50	14
Zolpidem Tartrate	Zolpidem Tartrate	50	suppressed
Ibuprofen	Ibuprofen	49	18
Irbesartan	Irbesartan	49	15
Farxiga	Dapagliflozin Propanediol	47	suppressed
Colchicine	Colchicine	46	17
Etodolac	Etodolac	46	17
Carvedilol	Carvedilol	42	12
Ciprofloxacin Hcl	Ciprofloxacin Hcl	39	31
Irbesartan-Hydrochlorothiazide	Irbesartan/Hydrochlorothiazide	36	suppressed
Januvia	Sitagliptin Phosphate	36	suppressed
Ketoconazole	Ketoconazole	36	suppressed
Methylprednisolone	Methylprednisolone	36	31
Olmesartan Medoxomil	Olmesartan Medoxomil	36	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	35	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	34	suppressed
Metformin Hcl Er	Metformin Hcl	33	suppressed
Olmesartan-Amlodipine-Hctz	Olmesartan/Amlodipin/Hcthiazid	32	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	31	suppressed
Levetiracetam	Levetiracetam	31	suppressed
Sertraline Hcl	Sertraline Hcl	31	12
Vitamin D2	Ergocalciferol (Vitamin D2)	31	suppressed
Janumet	Sitagliptin Phos/Metformin Hcl	30	suppressed
Propranolol Hcl	Propranolol Hcl	30	suppressed
Humalog Kwikpen U-100	Insulin Lispro	29	suppressed
Testosterone Cypionate	Testosterone Cypionate	29	suppressed
Allopurinol	Allopurinol	28	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	28	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	28	15
Clopidogrel	Clopidogrel Bisulfate	27	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	27	suppressed
Duloxetine Hcl	Duloxetine Hcl	26	suppressed
Xarelto	Rivaroxaban	26	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	25	suppressed
Meclizine Hcl	Meclizine Hcl	25	13
Venlafaxine Hcl Er	Venlafaxine Hcl	25	suppressed
Acetazolamide	Acetazolamide	23	suppressed
Clonazepam	Clonazepam	23	suppressed
Clotrimazole-Betamethasone	Clotrimazole/Betamethasone Dip	23	suppressed
Glimepiride	Glimepiride	23	suppressed
Symbicort	Budesonide/Formoterol Fumarate	23	suppressed
Amlodipine-Atorvastatin	Amlodipine/Atorvastatin	22	suppressed
Divalproex Sodium	Divalproex Sodium	22	suppressed
Febuxostat	Febuxostat	22	suppressed
Ultra-Fine Nano Pen Needle	Pen Needle, Diabetic	22	suppressed
Bupropion Xl	Bupropion Hcl	21	suppressed
Mupirocin	Mupirocin	21	suppressed
Tramadol Hcl	Tramadol Hcl	21	suppressed
Glipizide Er	Glipizide	20	suppressed
Hydralazine Hcl	Hydralazine Hcl	20	suppressed
Jardiance	Empagliflozin	20	suppressed
Lactulose	Lactulose	20	suppressed
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	19	suppressed
Clarithromycin	Clarithromycin	18	17
Ezetimibe	Ezetimibe	18	suppressed
Gemfibrozil	Gemfibrozil	18	suppressed
Erythromycin	Erythromycin Base	17	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	17	suppressed
Levocetirizine Dihydrochloride	Levocetirizine Dihydrochloride	17	suppressed
Lorazepam	Lorazepam	17	suppressed
Prednisone	Prednisone	17	suppressed
Amlodipine-Valsartan-Hctz	Amlodipine/Valsartan/Hcthiazid	15	suppressed
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	15	suppressed
Hydroxyzine Pamoate	Hydroxyzine Pamoate	15	suppressed
Metolazone	Metolazone	15	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	15	suppressed
Nifedipine Er	Nifedipine	15	suppressed
Scopolamine	Scopolamine	15	suppressed
Carbamazepine	Carbamazepine	14	suppressed
Carbamazepine Er	Carbamazepine	14	suppressed
Dexlansoprazole Dr	Dexlansoprazole	14	suppressed
Finasteride	Finasteride	14	suppressed
Valacyclovir	Valacyclovir Hcl	14	suppressed
Acitretin	Acitretin	13	suppressed
Ammonium Lactate	Ammonium Lactate	13	suppressed
Breo Ellipta	Fluticasone/Vilanterol	13	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	13	suppressed
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	13	suppressed
Lurasidone Hcl	Lurasidone Hcl	13	suppressed
Amlodipine-Olmesartan	Amlodipine Bes/Olmesartan Med	12	suppressed
Chlorthalidone	Chlorthalidone	12	suppressed
Edarbyclor	Azilsartan Med/Chlorthalidone	12	suppressed
Lovastatin	Lovastatin	12	suppressed
Novolog Mix 70-30 Flexpen	Insulin Aspart Prot/Insuln Asp	12	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	12	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	12	suppressed
Toujeo Max Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Donepezil Hcl	Donepezil Hcl	11	suppressed
Fluconazole	Fluconazole	11	suppressed
Hydrocortisone	Hydrocortisone	11	suppressed
Nystop	Nystatin	11	suppressed
Tresiba Flextouch U-100	Insulin Degludec	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