What is John Mahmarian's specialty?

John Mahmarian (NPI 1114957511) is a Medicare-billing provider whose primary specialty is Cardiology in Houston, TX.

Where does John Mahmarian practice?

John Mahmarian practices in Houston, TX, based on the location reported in the CMS Medicare provider datasets for NPI 1114957511.

How much does Medicare pay John Mahmarian?

John Mahmarian (NPI 1114957511) received approximately $124K in total Medicare Part B payments, serving 808 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1114957511

John MahmarianM.D.

CardiologyHouston, TXI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

1,883

Unique beneficiaries

—

Total services

2,057

Distinct HCPCS

Medicare payment

$122K

Peer benchmark

Total Medicare services vs. 1,379 Cardiology providers in TX — below median (cohort median 2,215).

PRESCRIBING · PART D · 2024

Total Rx claims

2,510

Beneficiaries

—

Total drug cost

$282K

Distinct drugs

Brand share

16.9%

Top prescribed drugs

Rosuvastatin Calcium505 claims

Ezetimibe285 claims

Carvedilol249 claims

Losartan Potassium214 claims

Amlodipine Besylate152 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$90

Payment records

By payment type

Food and Beverage$90

Top paying entities

Food and Beverage$90

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (4)

Hospital

Hospital

Hospital

Hospital

REFERRAL NETWORK

Where John Mahmarian's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 67 inbound referrers · 137 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
Quest Diagnostics Clinical Laboratories Inc Clinical Laboratory · Houston, TX	157	320
Su Chang Cardiology · Houston, TX	113	201
Chun Lin Interventional Cardiology · San Francisco, CA	111	282
Zsolt Garami General Practice · Houston, TX	89	128
Sherif Nagueh Cardiology · Houston, TX	74	98
Faisal Nabi Cardiology · Houston, TX	69	134
Dipan Shah Cardiology · Houston, TX	69	119
John Haddad Diagnostic Radiology · Houston, TX	63	86
Kapil Shroff Diagnostic Radiology · Houston, TX	62	98
HEDRICK, THOMAS	61	87
City Of Houston Ambulance Service Provider · Houston, TX	58	75
Tilottama Majumdar Pulmonary Disease · Birmingham, AL	53	84

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
THE METHODIST HOSPITAL	395	767
Chun Lin Interventional Cardiology · San Francisco, CA	157	402
Su Chang Cardiology · Houston, TX	149	262
Quest Diagnostics Clinical Laboratories Inc Clinical Laboratory · Houston, TX	144	350
Colin Barker Internal Medicine · Nashville, TN	134	424
Stephen Little Cardiology · Houston, TX	111	184
John Buergler Interventional Cardiology · Houston, TX	100	292
Faisal Nabi Cardiology · Houston, TX	96	178
Dipan Shah Cardiology · Houston, TX	91	166
Sherif Nagueh Cardiology · Houston, TX	69	116
Miguel Quinones Cardiology · Houston, TX	67	91
HEDRICK, THOMAS	64	103

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events