Healthcare provider profile · identity verified

David Nathanson

Internal Medicine · WALNUT CREEK, CA · NPI 1013478676

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	328	128
Amlodipine Besylate	Amlodipine Besylate	223	85
Losartan Potassium	Losartan Potassium	153	57
Lisinopril	Lisinopril	145	53
Levothyroxine Sodium	Levothyroxine Sodium	144	47
Fluticasone Propionate	Fluticasone Propionate	140	56
Gabapentin	Gabapentin	121	37
Tamsulosin Hcl	Tamsulosin Hcl	108	43
Trazodone Hcl	Trazodone Hcl	92	36
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	84	16
Metformin Hcl	Metformin Hcl	76	25
Hydrochlorothiazide	Hydrochlorothiazide	73	30
Albuterol Sulfate Hfa	Albuterol Sulfate	71	38
Azelastine Hcl	Azelastine Hcl	71	17
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	71	31
Famotidine	Famotidine	64	28
Tizanidine Hcl	Tizanidine Hcl	62	19
Furosemide	Furosemide	59	27
Glipizide	Glipizide	58	20
Pantoprazole Sodium	Pantoprazole Sodium	58	25
Atenolol	Atenolol	56	23
Simvastatin	Simvastatin	50	22
Metoprolol Tartrate	Metoprolol Tartrate	47	22
Omeprazole	Omeprazole	44	14
Ozempic	Semaglutide	44	suppressed
Metformin Hcl Er	Metformin Hcl	42	19
Alendronate Sodium	Alendronate Sodium	41	16
Alvesco	Ciclesonide	41	18
Metoprolol Succinate	Metoprolol Succinate	40	17
Carvedilol	Carvedilol	39	16
Ibuprofen	Ibuprofen	39	15
Ipratropium Bromide	Ipratropium Bromide	38	13
Hydralazine Hcl	Hydralazine Hcl	35	14
Hydrocortisone	Hydrocortisone	34	15
Losartan-Hydrochlorothiazide	Losartan/Hydrochlorothiazide	34	13
Allopurinol	Allopurinol	33	15
Lovastatin	Lovastatin	32	14
Clonidine Hcl	Clonidine Hcl	31	suppressed
Jardiance	Empagliflozin	31	12
Tramadol Hcl	Tramadol Hcl	30	suppressed
Rosuvastatin Calcium	Rosuvastatin Calcium	28	11
Citalopram Hbr	Citalopram Hydrobromide	27	12
Terazosin Hcl	Terazosin Hcl	27	11
Fluoxetine Hcl	Fluoxetine Hcl	26	suppressed
Meloxicam	Meloxicam	26	suppressed
Potassium Chloride	Potassium Chloride	25	suppressed
Sertraline Hcl	Sertraline Hcl	24	suppressed
Buspirone Hcl	Buspirone Hcl	23	suppressed
Humulin N Kwikpen	Insulin Nph Human Isophane	23	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	23	17
Pravastatin Sodium	Pravastatin Sodium	23	suppressed
Escitalopram Oxalate	Escitalopram Oxalate	22	suppressed
Montelukast Sodium	Montelukast Sodium	22	11
Pradaxa	Dabigatran Etexilate Mesylate	21	suppressed
Colchicine	Colchicine	20	11
Donepezil Hcl	Donepezil Hcl	20	suppressed
Cefadroxil	Cefadroxil	19	19
Prednisone	Prednisone	19	16
Shingrix	Varicella-Zoster Ge/As01b/Pf	18	13
Spiriva Respimat	Tiotropium Bromide	18	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	18	suppressed
Amoxicillin	Amoxicillin	17	11
Finasteride	Finasteride	17	suppressed
Propranolol Hcl	Propranolol Hcl	17	suppressed
Triamcinolone Acetonide	Triamcinolone Acetonide	17	suppressed
Fluocinonide	Fluocinonide	16	suppressed
Ondansetron Hcl	Ondansetron Hcl	16	suppressed
Wixela Inhub	Fluticasone Propion/Salmeterol	16	suppressed
Duloxetine Hcl	Duloxetine Hcl	15	suppressed
Humulin N	Insulin Nph Human Isophane	15	suppressed
Ultra-Fine Mini Pen Needle	Pen Needle, Diabetic	15	suppressed
Glipizide Er	Glipizide	13	suppressed
Glycopyrrolate	Glycopyrrolate	13	suppressed
Nortriptyline Hcl	Nortriptyline Hcl	13	suppressed
Spironolactone	Spironolactone	13	suppressed
Bupropion Xl	Bupropion Hcl	12	suppressed
Divalproex Sodium	Divalproex Sodium	12	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	12	suppressed
Naproxen	Naproxen	12	suppressed
Sulfasalazine	Sulfasalazine	12	suppressed
Baclofen	Baclofen	11	suppressed
Clonazepam	Clonazepam	11	suppressed
Clopidogrel	Clopidogrel Bisulfate	11	suppressed
Dicyclomine Hcl	Dicyclomine Hcl	11	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	11	suppressed
Methocarbamol	Methocarbamol	11	suppressed
Retin-A	Tretinoin	11	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	11	suppressed
Zolpidem Tartrate	Zolpidem Tartrate	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