Healthcare provider profile · identity verified

Dorcas C. Ang, MD

Internal Medicine · FONTANA, CA · NPI 1508914417

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	533	179
Levothyroxine Sodium	Levothyroxine Sodium	472	140
Lisinopril	Lisinopril	343	117
Amlodipine Besylate	Amlodipine Besylate	267	95
Losartan Potassium	Losartan Potassium	253	81
Simvastatin	Simvastatin	244	73
Omeprazole	Omeprazole	226	81
Metformin Hcl Er	Metformin Hcl	182	67
Trazodone Hcl	Trazodone Hcl	173	51
Gabapentin	Gabapentin	164	52
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	162	31
Meloxicam	Meloxicam	161	50
Hydrochlorothiazide	Hydrochlorothiazide	144	53
Alendronate Sodium	Alendronate Sodium	139	47
Albuterol Sulfate Hfa	Albuterol Sulfate	133	62
Pantoprazole Sodium	Pantoprazole Sodium	133	45
Montelukast Sodium	Montelukast Sodium	124	41
Azelastine Hcl	Azelastine Hcl	119	41
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	114	34
Potassium Chloride	Potassium Chloride	110	40
Pradaxa	Dabigatran Etexilate Mesylate	103	35
Prednisone	Prednisone	102	77
Bisoprolol Fumarate	Bisoprolol Fumarate	101	41
Metoprolol Tartrate	Metoprolol Tartrate	101	32
Terazosin Hcl	Terazosin Hcl	94	31
Acetaminophen-Codeine	Acetaminophen With Codeine	92	22
Tramadol Hcl	Tramadol Hcl	86	29
Famotidine	Famotidine	84	33
Metformin Hcl	Metformin Hcl	83	32
Estradiol	Estradiol	82	28
Bupropion Hcl Sr	Bupropion Hcl	81	25
Atenolol	Atenolol	79	26
Glipizide	Glipizide	79	27
Sertraline Hcl	Sertraline Hcl	78	27
Triamcinolone Acetonide	Triamcinolone Acetonide	77	44
Ibuprofen	Ibuprofen	73	24
Fluticasone Propionate	Fluticasone Propionate	72	20
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	70	30
Duloxetine Hcl	Duloxetine Hcl	67	25
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	66	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	65	22
Allopurinol	Allopurinol	64	20
Furosemide	Furosemide	64	25
Temazepam	Temazepam	64	suppressed
Lorazepam	Lorazepam	63	11
Rosuvastatin Calcium	Rosuvastatin Calcium	63	25
Hydrocortisone	Hydrocortisone	56	33
Escitalopram Oxalate	Escitalopram Oxalate	49	16
Humulin N	Insulin Nph Human Isophane	48	17
Acyclovir	Acyclovir	45	18
Colchicine	Colchicine	43	16
Spironolactone	Spironolactone	43	17
Victoza 2-Pak	Liraglutide	43	12
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	42	38
Liraglutide	Liraglutide	41	12
Rizatriptan	Rizatriptan Benzoate	41	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	40	11
Tamsulosin Hcl	Tamsulosin Hcl	40	13
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	39	39
Trospium Chloride	Trospium Chloride	39	15
Zenpep	Lipase/Protease/Amylase	39	11
Bupropion Xl	Bupropion Hcl	38	15
Spiriva Respimat	Tiotropium Bromide	38	13
Chlorthalidone	Chlorthalidone	37	14
Lidocaine	Lidocaine	37	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	37	14
Eliquis	Apixaban	36	14
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	36	12
Buspirone Hcl	Buspirone Hcl	35	15
Wixela Inhub	Fluticasone Propion/Salmeterol	35	11
Methenamine Hippurate	Methenamine Hippurate	34	13
Naproxen	Naproxen	34	15
Ozempic	Semaglutide	34	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	34	13
Finasteride	Finasteride	33	13
Ipratropium Bromide	Ipratropium Bromide	32	14
Morphine Sulfate Er	Morphine Sulfate	32	suppressed
Ondansetron Odt	Ondansetron	32	14
Clopidogrel	Clopidogrel Bisulfate	31	14
Ibandronate Sodium	Ibandronate Sodium	31	11
Nystatin	Nystatin	31	12
Clonidine Hcl	Clonidine Hcl	30	12
Pravastatin Sodium	Pravastatin Sodium	30	suppressed
Cartia Xt	Diltiazem Hcl	29	20
Hydralazine Hcl	Hydralazine Hcl	29	12
Topiramate	Topiramate	29	14
Arexvy	Rsvpref3 Antigen/As01e/Pf	28	28
Carvedilol	Carvedilol	27	11
Cephalexin	Cephalexin	27	21
Fenofibrate	Fenofibrate	27	suppressed
Lactulose	Lactulose	27	suppressed
Tizanidine Hcl	Tizanidine Hcl	27	16
Donepezil Hcl	Donepezil Hcl	26	suppressed
Ezetimibe	Ezetimibe	26	suppressed
Ondansetron Hcl	Ondansetron Hcl	26	suppressed
Alvesco	Ciclesonide	25	13
Clobetasol Propionate	Clobetasol Propionate	25	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	25	suppressed
Gavilyte-C	Peg3350/Sod Sulf,bicarb,cl/Kcl	24	21
Morphine Sulfate	Morphine Sulfate	24	suppressed
Veo Insulin Syringe	Syringe And Needle,insulin,1ml	24	suppressed
Alprazolam	Alprazolam	23	suppressed
Azithromycin	Azithromycin	23	21
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	23	suppressed
Cefuroxime	Cefuroxime Axetil	22	21
Humulin N Kwikpen	Insulin Nph Human Isophane	22	suppressed
Testosterone	Testosterone	22	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	21	21
Memantine Hcl	Memantine Hcl	20	suppressed
Citalopram Hbr	Citalopram Hydrobromide	19	suppressed
Humulin R	Insulin Regular, Human	19	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	19	suppressed
Nifedipine Er	Nifedipine	19	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	18	17
Jardiance	Empagliflozin	18	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	18	suppressed
Humulin 70/30 Kwikpen	Insulin Nph Hum/Reg Insulin Hm	17	suppressed
Nabumetone	Nabumetone	17	suppressed
Nitroglycerin	Nitroglycerin	17	suppressed
Risedronate Sodium	Risedronate Sodium	17	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	17	suppressed
Baclofen	Baclofen	16	suppressed
Carbidopa-Levodopa	Carbidopa/Levodopa	16	suppressed
Digoxin	Digoxin	16	suppressed
Oxazepam	Oxazepam	16	suppressed
Amoxicillin	Amoxicillin	15	13
Cholestyramine	Cholestyramine (With Sugar)	15	suppressed
Fluocinonide	Fluocinonide	15	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	15	suppressed
Proctozone-Hc	Hydrocortisone	15	suppressed
Propranolol Hcl	Propranolol Hcl	15	suppressed
Warfarin Sodium	Warfarin Sodium	15	suppressed
Divalproex Sodium	Divalproex Sodium	14	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	14	suppressed
Betamethasone Valerate	Betamethasone Valerate	13	suppressed
Metoprolol Succinate	Metoprolol Succinate	13	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	13	suppressed
Potassium Citrate Er	Potassium Citrate	13	suppressed
Climara	Estradiol	12	suppressed
Clonazepam	Clonazepam	12	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	12	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	12	suppressed
Methocarbamol	Methocarbamol	12	suppressed
Metronidazole	Metronidazole	12	suppressed
Mirtazapine	Mirtazapine	12	suppressed
Ssd	Silver Sulfadiazine	12	suppressed
Clindamycin Hcl	Clindamycin Hcl	11	suppressed
Diltiazem Hcl	Diltiazem Hcl	11	suppressed
Haloperidol	Haloperidol	11	suppressed
Ketoconazole	Ketoconazole	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