Healthcare provider profile · identity verified

Rolf D. Knapp, D.O

Osteopathic Manipulative Medicine · ORANGE, CA · NPI 1053355982

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
Levothyroxine Sodium	Levothyroxine Sodium	279	76
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	226	40
Atorvastatin Calcium	Atorvastatin Calcium	214	73
Losartan Potassium	Losartan Potassium	160	47
Omeprazole	Omeprazole	142	45
Amlodipine Besylate	Amlodipine Besylate	118	34
Rosuvastatin Calcium	Rosuvastatin Calcium	108	31
Escitalopram Oxalate	Escitalopram Oxalate	105	26
Trazodone Hcl	Trazodone Hcl	102	28
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	101	16
Alprazolam	Alprazolam	96	33
Tramadol Hcl	Tramadol Hcl	89	16
Gabapentin	Gabapentin	87	26
Lorazepam	Lorazepam	87	18
Bupropion Xl	Bupropion Hcl	82	20
Hydrochlorothiazide	Hydrochlorothiazide	81	21
Benazepril Hcl	Benazepril Hcl	77	22
Metformin Hcl	Metformin Hcl	77	28
Simvastatin	Simvastatin	75	22
Meloxicam	Meloxicam	74	13
Ozempic	Semaglutide	68	13
Carvedilol	Carvedilol	66	19
Lisinopril	Lisinopril	64	17
Tamsulosin Hcl	Tamsulosin Hcl	64	18
Duloxetine Hcl	Duloxetine Hcl	61	13
Mirtazapine	Mirtazapine	61	15
Famotidine	Famotidine	58	17
Montelukast Sodium	Montelukast Sodium	58	19
Albuterol Sulfate Hfa	Albuterol Sulfate	56	19
Pantoprazole Sodium	Pantoprazole Sodium	56	19
Zolpidem Tartrate	Zolpidem Tartrate	56	17
Metoprolol Succinate	Metoprolol Succinate	55	16
Furosemide	Furosemide	54	18
Pregabalin	Pregabalin	48	11
Metoprolol Tartrate	Metoprolol Tartrate	47	13
Estradiol	Estradiol	41	14
Diazepam	Diazepam	39	11
Sumatriptan Succinate	Sumatriptan Succinate	39	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	38	12
Ibuprofen	Ibuprofen	37	12
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	37	25
Synthroid	Levothyroxine Sodium	37	11
Finasteride	Finasteride	33	suppressed
Citalopram Hbr	Citalopram Hydrobromide	32	suppressed
Prednisone	Prednisone	32	26
Sertraline Hcl	Sertraline Hcl	31	suppressed
Clopidogrel	Clopidogrel Bisulfate	30	suppressed
Gammagard Liquid	Immun Glob G(Igg)/Gly/Iga Ov50	30	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	29	suppressed
Levofloxacin	Levofloxacin	29	21
Clonidine Hcl	Clonidine Hcl	28	suppressed
Hydromorphone Hcl	Hydromorphone Hcl	28	suppressed
Ketoconazole	Ketoconazole	28	12
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	28	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	28	14
Atenolol	Atenolol	27	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	27	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	27	suppressed
Fluticasone Propionate	Fluticasone Propionate	26	12
Januvia	Sitagliptin Phosphate	26	suppressed
Ondansetron Odt	Ondansetron	25	suppressed
Oxcarbazepine	Oxcarbazepine	25	suppressed
Clonazepam	Clonazepam	24	suppressed
Eliquis	Apixaban	24	11
Ezetimibe	Ezetimibe	24	suppressed
Cefdinir	Cefdinir	23	22
Estradiol (Twice Weekly)	Estradiol	23	suppressed
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	23	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	22	19
Cymbalta	Duloxetine Hcl	22	suppressed
Metformin Hcl Er	Metformin Hcl	22	suppressed
Triamterene-Hydrochlorothiazid	Triamterene/Hydrochlorothiazid	21	suppressed
Acetaminophen-Codeine	Acetaminophen With Codeine	20	suppressed
Alendronate Sodium	Alendronate Sodium	20	suppressed
Potassium Chloride	Potassium Chloride	20	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	20	suppressed
Fluconazole	Fluconazole	19	11
Xarelto	Rivaroxaban	19	suppressed
Oxybutynin Chloride Er	Oxybutynin Chloride	18	suppressed
Verapamil Er	Verapamil Hcl	18	suppressed
Mupirocin	Mupirocin	17	suppressed
Diphenhydramine Hcl	Diphenhydramine Hcl	16	suppressed
Eszopiclone	Eszopiclone	16	suppressed
Felodipine Er	Felodipine	16	suppressed
Naproxen	Naproxen	16	suppressed
Paroxetine Hcl	Paroxetine Hcl	16	suppressed
Symbicort	Budesonide/Formoterol Fumarate	16	suppressed
Tizanidine Hcl	Tizanidine Hcl	16	suppressed
Donepezil Hcl	Donepezil Hcl	15	suppressed
Glimepiride	Glimepiride	15	suppressed
Temazepam	Temazepam	15	suppressed
Azelastine Hcl	Azelastine Hcl	14	suppressed
Celecoxib	Celecoxib	14	suppressed
Dextrose In Water	Dextrose 5 % In Water	14	suppressed
Fluoxetine Hcl	Fluoxetine Hcl	14	suppressed
Lovastatin	Lovastatin	14	suppressed
Tradjenta	Linagliptin	14	suppressed
Belsomra	Suvorexant	13	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	13	suppressed
Testosterone	Testosterone	13	suppressed
Concerta	Methylphenidate Hcl	12	suppressed
Dextroamphetamine-Amphetamine	Dextroamphetamine/Amphetamine	12	suppressed
Epinephrine	Epinephrine	12	suppressed
Jardiance	Empagliflozin	12	suppressed
Methadone Hcl	Methadone Hcl	12	suppressed
Morphine Sulfate Er	Morphine Sulfate	12	suppressed
Potassium Citrate Er	Potassium Citrate	12	suppressed
Quetiapine Fumarate	Quetiapine Fumarate	12	suppressed
Tramadol Hcl-Acetaminophen	Tramadol Hcl/Acetaminophen	12	suppressed
Valacyclovir	Valacyclovir Hcl	12	suppressed
Ascomp With Codeine	Codeine/Butalbital/Asa/Caffein	11	suppressed
Diphenoxylate-Atropine	Diphenoxylate Hcl/Atropine	11	suppressed
Eucrisa	Crisaborole	11	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	11	suppressed
Progesterone	Progesterone, Micronized	11	suppressed
Savella	Milnacipran Hcl	11	suppressed
Tazarotene	Tazarotene	11	suppressed
Wegovy	Semaglutide	11	suppressed
Wellbutrin Xl	Bupropion Hcl	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