Healthcare provider profile · identity verified

John Mark Geiss, D.O.

Family Practice · SANTA ANA, CA · NPI 1053651497

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

BrandGenericClaimsBeneficiaries
Atorvastatin CalciumAtorvastatin Calcium43272
EliquisApixaban37634
GabapentinGabapentin32347
Levothyroxine SodiumLevothyroxine Sodium27150
Metoprolol TartrateMetoprolol Tartrate22839
Amlodipine BesylateAmlodipine Besylate21635
Losartan PotassiumLosartan Potassium18530
FurosemideFurosemide18333
Tamsulosin HclTamsulosin Hcl17233
FamotidineFamotidine16732
Potassium ChloridePotassium Chloride15532
LisinoprilLisinopril15126
Donepezil HclDonepezil Hcl14223
Metformin HclMetformin Hcl13019
OmeprazoleOmeprazole10721
MirtazapineMirtazapine10631
LactuloseLactulose10017
Trazodone HclTrazodone Hcl9715
XareltoRivaroxaban96suppressed
BaclofenBaclofen8915
Memantine HclMemantine Hcl8913
Pantoprazole SodiumPantoprazole Sodium8816
LevetiracetamLevetiracetam82suppressed
FinasterideFinasteride8116
Quetiapine FumarateQuetiapine Fumarate7811
Warfarin SodiumWarfarin Sodium69suppressed
CarvedilolCarvedilol6714
Metoprolol SuccinateMetoprolol Succinate66suppressed
ClopidogrelClopidogrel Bisulfate6317
Hydralazine HclHydralazine Hcl6321
Duloxetine HclDuloxetine Hcl61suppressed
SimvastatinSimvastatin58suppressed
LatanoprostLatanoprost5715
Carbidopa-LevodopaCarbidopa/Levodopa5511
Lantus SolostarInsulin Glargine,hum.Rec.Anlog5411
SucralfateSucralfate52suppressed
LidocaineLidocaine50suppressed
Escitalopram OxalateEscitalopram Oxalate47suppressed
AllopurinolAllopurinol45suppressed
Divalproex SodiumDivalproex Sodium44suppressed
LovastatinLovastatin44suppressed
Ipratropium-AlbuterolIpratropium/Albuterol Sulfate4318
Sertraline HclSertraline Hcl41suppressed
Sodium Chloride0.9 % Sodium Chloride3919
DigoxinDigoxin35suppressed
LansoprazoleLansoprazole35suppressed
Amiodarone HclAmiodarone Hcl33suppressed
Brimonidine TartrateBrimonidine Tartrate32suppressed
MethocarbamolMethocarbamol32suppressed
Basaglar Kwikpen U-100Insulin Glargine,hum.Rec.Anlog31suppressed
Fluticasone-SalmeterolFluticasone Propion/Salmeterol31suppressed
Humulin RInsulin Regular, Human31suppressed
CarbamazepineCarbamazepine29suppressed
HydrocortisoneHydrocortisone29suppressed
PrednisonePrednisone29suppressed
Doxazosin MesylateDoxazosin Mesylate28suppressed
Diclofenac SodiumDiclofenac Sodium27suppressed
Benazepril HclBenazepril Hcl26suppressed
Alendronate SodiumAlendronate Sodium25suppressed
Cyclobenzaprine HclCyclobenzaprine Hcl25suppressed
Dantrolene SodiumDantrolene Sodium25suppressed
FenofibrateFenofibrate Nanocrystallized25suppressed
JanuviaSitagliptin Phosphate25suppressed
Methenamine HippurateMethenamine Hippurate24suppressed
Ondansetron HclOndansetron Hcl2416
Rosuvastatin CalciumRosuvastatin Calcium24suppressed
Citalopram HbrCitalopram Hydrobromide23suppressed
ClonidineClonidine23suppressed
LubiprostoneLubiprostone23suppressed
OlanzapineOlanzapine23suppressed
Ropinirole HclRopinirole Hcl22suppressed
Fludrocortisone AcetateFludrocortisone Acetate21suppressed
Fluticasone PropionateFluticasone Propionate21suppressed
Insulin Lispro Kwikpen U-100Insulin Lispro21suppressed
TrulicityDulaglutide21suppressed
Buspirone HclBuspirone Hcl20suppressed
ChlorthalidoneChlorthalidone20suppressed
Clonidine HclClonidine Hcl20suppressed
Novolin RInsulin Regular, Human20suppressed
Amikacin SulfateAmikacin Sulfate19suppressed
GlimepirideGlimepiride19suppressed
GlipizideGlipizide19suppressed
Mycophenolate MofetilMycophenolate Mofetil19suppressed
Verapamil ErVerapamil Hcl19suppressed
Midodrine HclMidodrine Hcl18suppressed
Ranolazine ErRanolazine18suppressed
XifaxanRifaximin18suppressed
EntrestoSacubitril/Valsartan17suppressed
Nitrofurantoin Mono-MacroNitrofurantoin Monohyd/M-Cryst17suppressed
ZenpepLipase/Protease/Amylase17suppressed
Albuterol Sulfate HfaAlbuterol Sulfate16suppressed
AripiprazoleAripiprazole16suppressed
Dicyclomine HclDicyclomine Hcl16suppressed
Propranolol HclPropranolol Hcl16suppressed
RisperidoneRisperidone16suppressed
Valproic AcidValproic Acid (As Sodium Salt)16suppressed
AlprazolamAlprazolam15suppressed
AtenololAtenolol15suppressed
CyclosporineCyclosporine15suppressed
Dorzolamide HclDorzolamide Hcl15suppressed
IngrezzaValbenazine Tosylate15suppressed
Isosorbide Mononitrate ErIsosorbide Mononitrate15suppressed
MeloxicamMeloxicam15suppressed
MovantikNaloxegol Oxalate15suppressed
TacrolimusTacrolimus15suppressed
ErtapenemErtapenem Sodium14suppressed
Humalog Kwikpen U-100Insulin Lispro14suppressed
HydrochlorothiazideHydrochlorothiazide14suppressed
Hydroxyzine HclHydroxyzine Hcl14suppressed
Labetalol HclLabetalol Hcl14suppressed
Novolin R FlexpenInsulin Regular, Human14suppressed
Ondansetron OdtOndansetron14suppressed
Amitriptyline HclAmitriptyline Hcl13suppressed
Bupropion HclBupropion Hcl13suppressed
Dexlansoprazole DrDexlansoprazole13suppressed
Enoxaparin SodiumEnoxaparin Sodium13suppressed
Hydroxychloroquine SulfateHydroxychloroquine Sulfate13suppressed
Azelastine HclAzelastine Hcl12suppressed
CephalexinCephalexin12suppressed
Ciprofloxacin HclCiprofloxacin Hcl12suppressed
DutasterideDutasteride12suppressed
FebuxostatFebuxostat12suppressed
Humulin 70/30 KwikpenInsulin Nph Hum/Reg Insulin Hm12suppressed
HydroxyureaHydroxyurea12suppressed
Ipratropium BromideIpratropium Bromide12suppressed
Montelukast SodiumMontelukast Sodium12suppressed
MyrbetriqMirabegron12suppressed
SpironolactoneSpironolactone12suppressed
Cholestyramine LightCholestyramine11suppressed
EzetimibeEzetimibe11suppressed
MethotrexateMethotrexate Sodium11suppressed
MetolazoneMetolazone11suppressed
Nitroglycerin PatchNitroglycerin11suppressed
NystatinNystatin11suppressed
Selegiline HclSelegiline Hcl11suppressed

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.

YearGeneral PaymentsMain payerExplicit productsCompany overlapsPart D coverage
2025
2024 Complete

Questions to ask

Questions you could discuss with your doctor

These are general questions generated from reviewed templates. They are not personalized medical advice.

Sources and limitations

How to read this page

Loaded source releases

DatasetYearPublicationSource
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