Healthcare provider profile · identity verified

Irma Pfister, MD

Internal Medicine · SUGAR LAND, TX · NPI 1790740926

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	644	218
Amlodipine Besylate	Amlodipine Besylate	508	160
Levothyroxine Sodium	Levothyroxine Sodium	411	115
Simvastatin	Simvastatin	317	93
Metformin Hcl	Metformin Hcl	285	91
Rosuvastatin Calcium	Rosuvastatin Calcium	282	91
Losartan Potassium	Losartan Potassium	233	75
Alendronate Sodium	Alendronate Sodium	227	83
Lisinopril	Lisinopril	227	74
Omeprazole	Omeprazole	218	84
Ozempic	Semaglutide	216	34
Gabapentin	Gabapentin	208	86
Pantoprazole Sodium	Pantoprazole Sodium	188	67
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	177	33
Pravastatin Sodium	Pravastatin Sodium	160	47
Metformin Hcl Er	Metformin Hcl	157	56
Fluticasone Propionate	Fluticasone Propionate	153	60
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	145	42
Valsartan-Hydrochlorothiazide	Valsartan/Hydrochlorothiazide	131	38
Hydrochlorothiazide	Hydrochlorothiazide	130	47
Sertraline Hcl	Sertraline Hcl	124	47
Metoprolol Succinate	Metoprolol Succinate	118	46
Carvedilol	Carvedilol	100	31
Albuterol Sulfate Hfa	Albuterol Sulfate	99	39
Metoprolol Tartrate	Metoprolol Tartrate	98	34
Montelukast Sodium	Montelukast Sodium	92	33
Pioglitazone Hcl	Pioglitazone Hcl	89	32
Tizanidine Hcl	Tizanidine Hcl	89	44
Ciprofloxacin Hcl	Ciprofloxacin Hcl	83	74
Clopidogrel	Clopidogrel Bisulfate	79	24
Furosemide	Furosemide	79	38
Potassium Chloride	Potassium Chloride	74	29
Allopurinol	Allopurinol	73	21
Lorazepam	Lorazepam	72	30
Baclofen	Baclofen	70	37
Tamsulosin Hcl	Tamsulosin Hcl	69	25
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	64	21
Trazodone Hcl	Trazodone Hcl	64	26
Glimepiride	Glimepiride	63	24
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	59	53
Famotidine	Famotidine	59	27
Valsartan	Valsartan	56	21
Glipizide Er	Glipizide	52	19
Ezetimibe	Ezetimibe	51	19
Azithromycin	Azithromycin	49	46
Escitalopram Oxalate	Escitalopram Oxalate	49	19
Naproxen	Naproxen	46	21
Doxycycline Hyclate	Doxycycline Hyclate	45	42
Eliquis	Apixaban	45	13
Triamcinolone Acetonide	Triamcinolone Acetonide	44	36
Fenofibrate	Fenofibrate	43	suppressed
Ropinirole Hcl	Ropinirole Hcl	41	suppressed
Atenolol	Atenolol	38	13
Glipizide	Glipizide	38	13
Jardiance	Empagliflozin	38	21
Pregabalin	Pregabalin	37	13
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	36	suppressed
Diclofenac Sodium	Diclofenac Sodium	36	18
Hydralazine Hcl	Hydralazine Hcl	36	12
Januvia	Sitagliptin Phosphate	34	suppressed
Citalopram Hbr	Citalopram Hydrobromide	33	11
Olmesartan-Hydrochlorothiazide	Olmesartan/Hydrochlorothiazide	33	11
Duloxetine Hcl	Duloxetine Hcl	32	12
Glipizide-Metformin	Glipizide/Metformin Hcl	32	11
Amlodipine Besylate-Benazepril	Amlodipine Besylate/Benazepril	30	suppressed
Azelastine Hcl	Azelastine Hcl	30	19
Farxiga	Dapagliflozin Propanediol	29	13
Fluoxetine Hcl	Fluoxetine Hcl	29	11
Nifedipine Er	Nifedipine	28	suppressed
Prednisone	Prednisone	28	23
Sildenafil Citrate	Sildenafil Citrate	28	suppressed
Bupropion Xl	Bupropion Hcl	27	suppressed
Warfarin Sodium	Warfarin Sodium	27	suppressed
Tramadol Hcl	Tramadol Hcl	26	15
Finasteride	Finasteride	25	suppressed
Meloxicam	Meloxicam	24	13
Risedronate Sodium	Risedronate Sodium	24	13
Sumatriptan Succinate	Sumatriptan Succinate	24	suppressed
Alprazolam	Alprazolam	23	11
Ibuprofen	Ibuprofen	23	19
Ondansetron Hcl	Ondansetron Hcl	22	14
Spironolactone	Spironolactone	22	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	21	suppressed
Adacel Tdap	Diph,pertuss(Acell),tet Vac/Pf	21	21
Valacyclovir	Valacyclovir Hcl	21	15
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	20	suppressed
Metronidazole	Metronidazole	19	12
Donepezil Hcl	Donepezil Hcl	18	suppressed
Estradiol	Estradiol	18	11
Irbesartan	Irbesartan	18	suppressed
Methylprednisolone	Methylprednisolone	18	18
Mupirocin	Mupirocin	18	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	17	suppressed
Clonidine Hcl	Clonidine Hcl	17	suppressed
Abrysvo	Rsv Vacc, Pref A And Pref B/Pf	16	16
Advair Hfa	Fluticasone Propion/Salmeterol	16	suppressed
Buspirone Hcl	Buspirone Hcl	16	suppressed
Ramipril	Ramipril	16	suppressed
Atenolol-Chlorthalidone	Atenolol/Chlorthalidone	15	suppressed
Clonazepam	Clonazepam	15	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	15	suppressed
Synthroid	Levothyroxine Sodium	15	suppressed
Ibandronate Sodium	Ibandronate Sodium	14	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	14	suppressed
Sucralfate	Sucralfate	14	suppressed
Fluconazole	Fluconazole	13	suppressed
Hydrocortisone	Hydrocortisone	13	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	13	suppressed
Ketoconazole	Ketoconazole	13	suppressed
Nystatin	Nystatin	13	suppressed
Paxlovid	Nirmatrelvir/Ritonavir	13	13
Propranolol Hcl	Propranolol Hcl	13	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	13	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	12	suppressed
Lansoprazole	Lansoprazole	12	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	12	suppressed
Mounjaro	Tirzepatide	12	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	12	suppressed
Novolog Flexpen	Insulin Aspart	12	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	12	suppressed
Rizatriptan	Rizatriptan Benzoate	12	suppressed
Verapamil Er	Verapamil Hcl	12	suppressed
Benazepril Hcl	Benazepril Hcl	11	suppressed
Benazepril-Hydrochlorothiazide	Benazepril/Hydrochlorothiazide	11	suppressed
Bumetanide	Bumetanide	11	suppressed
Telmisartan	Telmisartan	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