Healthcare provider profile · identity verified

Christopher Callahan Schuster, MD

Family Practice · IOWA CITY, IA · NPI 1437479771

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	844	201
Levothyroxine Sodium	Levothyroxine Sodium	530	112
Amlodipine Besylate	Amlodipine Besylate	504	109
Losartan Potassium	Losartan Potassium	382	98
Lisinopril	Lisinopril	344	89
Metoprolol Succinate	Metoprolol Succinate	226	59
Hydrochlorothiazide	Hydrochlorothiazide	190	56
Omeprazole	Omeprazole	189	53
Gabapentin	Gabapentin	186	53
Simvastatin	Simvastatin	182	42
Metformin Hcl	Metformin Hcl	173	40
Rosuvastatin Calcium	Rosuvastatin Calcium	166	43
Pantoprazole Sodium	Pantoprazole Sodium	141	37
Eliquis	Apixaban	134	26
Alendronate Sodium	Alendronate Sodium	127	30
Metformin Hcl Er	Metformin Hcl	122	29
Duloxetine Hcl	Duloxetine Hcl	116	20
Montelukast Sodium	Montelukast Sodium	116	30
Albuterol Sulfate Hfa	Albuterol Sulfate	112	31
Fluoxetine Hcl	Fluoxetine Hcl	111	24
Furosemide	Furosemide	111	40
Tamsulosin Hcl	Tamsulosin Hcl	103	32
Jardiance	Empagliflozin	98	17
Ozempic	Semaglutide	98	13
Warfarin Sodium	Warfarin Sodium	86	21
Allopurinol	Allopurinol	83	18
Bupropion Xl	Bupropion Hcl	81	12
Terazosin Hcl	Terazosin Hcl	81	18
Famotidine	Famotidine	80	19
Potassium Chloride	Potassium Chloride	74	16
Pravastatin Sodium	Pravastatin Sodium	71	16
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	69	suppressed
Tramadol Hcl	Tramadol Hcl	67	12
Trazodone Hcl	Trazodone Hcl	67	20
Metoprolol Tartrate	Metoprolol Tartrate	65	18
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	62	suppressed
Glipizide	Glipizide	60	14
Carvedilol	Carvedilol	58	16
Clopidogrel	Clopidogrel Bisulfate	55	16
Januvia	Sitagliptin Phosphate	53	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	51	14
Pregabalin	Pregabalin	51	11
Sertraline Hcl	Sertraline Hcl	51	14
Alprazolam	Alprazolam	49	12
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	48	suppressed
Lorazepam	Lorazepam	46	15
Atenolol	Atenolol	45	13
Citalopram Hbr	Citalopram Hydrobromide	43	suppressed
Glimepiride	Glimepiride	42	11
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	42	11
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	39	suppressed
Ezetimibe	Ezetimibe	38	14
Buspirone Hcl	Buspirone Hcl	35	suppressed
Diclofenac Sodium	Diclofenac Sodium	34	suppressed
Propranolol Hcl Er	Propranolol Hcl	33	suppressed
Chlorthalidone	Chlorthalidone	32	suppressed
Fentanyl	Fentanyl	31	suppressed
Finasteride	Finasteride	31	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	29	suppressed
Topiramate	Topiramate	29	suppressed
Baclofen	Baclofen	28	suppressed
Glipizide Er	Glipizide	28	suppressed
Myrbetriq	Mirabegron	27	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	27	suppressed
Propranolol Hcl	Propranolol Hcl	27	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	26	suppressed
Prednisone	Prednisone	26	18
Arnuity Ellipta	Fluticasone Furoate	25	suppressed
Irbesartan	Irbesartan	25	suppressed
Ondansetron Odt	Ondansetron	25	suppressed
Tizanidine Hcl	Tizanidine Hcl	24	suppressed
Xarelto	Rivaroxaban	24	suppressed
Lovastatin	Lovastatin	23	suppressed
Pramipexole Dihydrochloride	Pramipexole Di-Hcl	23	suppressed
Spironolactone	Spironolactone	23	suppressed
Farxiga	Dapagliflozin Propanediol	22	suppressed
Naproxen	Naproxen	22	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	22	suppressed
Carbamazepine Er	Carbamazepine	21	suppressed
Linzess	Linaclotide	21	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	21	suppressed
Oxycodone Hcl	Oxycodone Hcl	20	suppressed
Clonazepam	Clonazepam	19	suppressed
Fluticasone Propionate	Fluticasone Propionate	19	suppressed
Isosorbide Mononitrate Er	Isosorbide Mononitrate	19	suppressed
Humalog Kwikpen U-100	Insulin Lispro	18	suppressed
Mirtazapine	Mirtazapine	18	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	18	suppressed
Benazepril Hcl	Benazepril Hcl	17	suppressed
Brilinta	Ticagrelor	17	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	17	suppressed
Lamotrigine	Lamotrigine	17	suppressed
Oxybutynin Chloride	Oxybutynin Chloride	17	suppressed
Solifenacin Succinate	Solifenacin Succinate	17	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	17	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	17	suppressed
Ultra-Fine Short Pen Needle	Pen Needle, Diabetic	17	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	16	suppressed
Amoxicillin	Amoxicillin	16	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	16	suppressed
Fenofibrate	Fenofibrate	16	suppressed
Varenicline Tartrate	Varenicline Tartrate	16	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	15	suppressed
Valacyclovir	Valacyclovir Hcl	15	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	15	suppressed
Breo Ellipta	Fluticasone/Vilanterol	14	suppressed
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	14	suppressed
Liothyronine Sodium	Liothyronine Sodium	14	suppressed
Nystatin	Nystatin	14	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	14	suppressed
Synthroid	Levothyroxine Sodium	14	suppressed
Torsemide	Torsemide	14	suppressed
Tresiba Flextouch U-200	Insulin Degludec	14	suppressed
Butalbital-Acetaminophen-Caffe	Butalb/Acetaminophen/Caffeine	13	suppressed
Incruse Ellipta	Umeclidinium Bromide	13	suppressed
Paroxetine Hcl	Paroxetine Hcl	13	suppressed
Cephalexin	Cephalexin	12	suppressed
Meloxicam	Meloxicam	12	suppressed
Nano 2nd Gen Pen Needle	Pen Needle, Diabetic	12	suppressed
Acyclovir	Acyclovir	11	suppressed
Enalapril Maleate	Enalapril Maleate	11	suppressed
Minoxidil	Minoxidil	11	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	11	suppressed
Spiriva Handihaler	Tiotropium Bromide	11	suppressed
Tresiba Flextouch U-100	Insulin Degludec	11	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	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