JOHN JOSEPH MAHMARIAN M.D.
NPI 1114957511
Internal Medicine - Cardiovascular Disease in Houston, TX

Q: What is John Mahmarian's NPI number?

The NPI number for John Mahmarian is 1114957511. It was assigned to this individual provider in the NPPES registry on July 3, 2006.

Q: What is John Mahmarian's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Q: When was this NPI record last updated?

The NPPES record for John Mahmarian was last updated on March 7, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since July 03, 2006PECOS EnrolledAccepts Medicare Assignment

6550 FANNIN ST, SMITH TOWER, SUITE 1901, HOUSTON, TX 77030(713) 441-1100(713) 790-2643 Get Directions Write a Review

NPPES record last updated: March 7, 2014. Verified against the NPPES registry weekly; last sync: August 09, 2026.

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About John Joseph Mahmarian M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN JOSEPH MAHMARIAN M.D. (NPI 1114957511) is an individual cardiovascular disease provider in Houston, Texas, licensed in Texas (F9767) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Houston Methodist Hospital, and is a graduate of New York Medical College (1980).

NPPES Registry Identity

NPI1114957511

Entity TypeIndividualMale

Primary Taxonomy207RC0000X

Provider Legal NameJOHN JOSEPH MAHMARIANCredential: M.D.

Location Address6550 FANNIN ST, SMITH TOWER, SUITE 1901Houston, TX 77030-2717

Mailing Address6550 Fannin St, Smith Tower, Suite 1901Houston, TX 77030-2717 · (713) 441-1100 · Fax (713) 790-2643

Phone(713) 441-1100

Fax(713) 790-2643

Sole ProprietorNo

Medical School CMSNew York Medical CollegeGraduated 1980

Enumeration DateJuly 3, 2006

Last NPPES UpdateMarch 7, 2014

✔ NPI 1114957511 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Cardiovascular DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RC0000X

License✔ Licensed in TX · F9767

Definition

An internist who specializes in diseases of the heart and blood vessels and manages complex cardiac conditions such as heart attacks and life-threatening, abnormal heartbeat rhythms.

6550 FANNIN ST, Houston, TX 77030

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Other Identifiers 15

Other8U8373TX · Blue Cross Blue Shield

OtherP01036901TX · Rr Medicare

Medicaid134999510TX

Medicare PIN8F1438TX

Medicare PINTXB145582TX

Other00T79STX · Medicare1

Medicaid134999509TX

Medicare PIN332670YMVQTX

Other612341TX · Medicare 2

Other770000927TX · Medicare 3

Medicare UPINB24570TX

OtherP00295327TX · Railroad Medicare

Medicaid134999511TX

Medicaid1375250LA

Medicare PIN8L4923TX

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Molina Healthcare, WellPoint.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

John Joseph Mahmarian M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID2668490459

PECOS Enrollment IDI20051110000207

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Ct scan of blood vessels of chest with contrast 71275

A CT scan of the chest with contrast is a non-invasive imaging test. It uses X-rays and a special dye to get detailed images of your blood vessels in the chest. This helps in diagnosing conditions related to heart and lungs.

325 services322 patients

Ct scan of blood vessels and grafts of heart with contrast 75574

A CT scan of the heart's blood vessels and grafts with contrast is a diagnostic test. A special dye (contrast) is injected into your veins, which helps create clear images of your heart's vessels and grafts. This helps doctors detect blockages or other abnormalities.

320 services317 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician 93018

An exercise or drug-induced heart stress test with ECG is a procedure to assess how your heart functions under stress. It can involve exercising or medication to make your heart work harder while an ECG records its activity. A physician reviews the results.

234 services232 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

182 services135 patients

Injection, regadenoson, 0.1 mg J2785

Regadenoson injection, 0.1 mg, is a medication used to help visualize the heart during a stress test. It works by increasing blood flow in the arteries of the heart. It's injected into a vein and is generally well-tolerated.

152 services38 patients

Nuclear medicine studies of blood flow in heart muscle at rest and with stress with concurrent ct scan 78431

This is a diagnostic test where a tiny amount of radioactive material is used to examine your heart's blood flow at rest & during stress, alongside a CT scan for detailed images. It helps identify any heart-related issues like blockages or damage.

135 services134 patients

Nuclear medicine study of heart muscle blood flow by pet 78434

A nuclear medicine study of heart muscle blood flow by PET is a non-invasive test that uses a small amount of radioactive substance to create detailed images of your heart's blood flow and function. It helps assess heart health and diagnose heart conditions.

135 services134 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician 93016

An exercise or drug-induced heart stress test with ECG involves monitoring your heart's activity while it's under stress, either from exercise or medication. A doctor supervises the entire procedure to ensure safety and accuracy in results. This test helps detect heart problems.

133 services132 patients

Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision and review by physician 93015

An exercise or drug-induced heart stress test with ECG is a procedure performed by a doctor to assess how your heart responds to exertion. It involves monitoring your heart's electrical activity while you exercise or after medication is given to mimic exercise effects.

76 services76 patients

Nuclear medicine study of heart muscle at rest and with stress and spect 78451

A nuclear medicine study of the heart muscle, both at rest and under stress, along with SPECT, helps assess heart health. A safe radioactive substance is injected, which the heart absorbs. Then, a special camera captures images of the heart. This procedure can detect heart disease or other issues.

63 services63 patients

Nuclear medicine studies of heart muscle at rest and with stress and spect 78452

Nuclear medicine studies of the heart involve two parts: rest and stress. During rest, images are taken of your heart at ease. During stress, images are taken after exercise or medication-induced stress. SPECT is a special imaging technique providing 3D pictures of your heart, helping identify any issues.

57 services57 patients

Technetium tc-99m tetrofosmin, diagnostic, per study dose A9502

Technetium Tc-99m Tetrofosmin is a radiopharmaceutical used in diagnostic imaging. It helps highlight areas of concern in the heart by emitting signals captured by a special camera. This assists doctors in detecting heart conditions.

43 services43 patients

Nuclear medicine studies of heart muscle at rest and with stress and spect 78452

40 services40 patients

Technetium tc-99m sestamibi, diagnostic, per study dose A9500

Technetium Tc-99m Sestamibi is a diagnostic test used to create images of your heart or breast tissues. It involves a safe radioactive substance injection that helps doctors to detect any abnormalities or changes in these tissues.

34 services32 patients

Nuclear medicine study, spect imaging, 1 area or single acquisition, single day imaging 78803

A nuclear medicine study with SPECT involves a safe, small amount of radioactive substance to help visualize body organs. SPECT, or Single Photon Emission Computed Tomography, creates detailed 3D images. This helps doctors diagnose and monitor conditions in a specific body area.

31 services31 patients

Nuclear medicine study of heart muscle at rest and with stress and spect 78451

19 services19 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

16 services16 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Houston Methodist Hospital

Acute Care Hospitals · Houston, TX

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450358

Location6565 FanninHouston, TX 77030 · Harris County

Emergency services Birthing friendly

Houston Methodist Sugarland Hospital

Acute Care Hospitals · Sugar Land, TX

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number450820

Location16655 Southwest FreewaySugar Land, TX 77479 · Fort Bend County

Emergency services Birthing friendly

Houston Methodist West Hospital

Acute Care Hospitals · Houston, TX

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number670077

Location18500 Katy FreewayHouston, TX 77094 · Harris County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 77030 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$134.06 typical visit price

range $58.24 – $176.98

Typical copayment $33.51 (range $14.56 – $44.24)

Most-billed visit code 99204

Established Patient

$72.62 typical visit price

range $18.60 – $143.93

Typical copayment $18.15 (range $4.65 – $35.98)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MEGAN MCCLANAHAN

Student in an Organized Health Care Education/Training Program

6550 FANNIN ST
HOUSTON, TX 77030

Harris County (713) 441-5155

MARIANNE CARLSON PSYD

Psychologist (Clinical)

6550 FANNIN ST
HOUSTON, TX 77030

Harris County (346) 248-2040

MARIE MCLAIN P.A.

Physician Assistant

6550 FANNIN ST, SMITH TOWER, SUITE 1901
HOUSTON, TX 77030

Harris County (713) 441-1100

DALIA MOGHAZY MD

Obstetrics & Gynecology

6550 FANNIN ST
HOUSTON, TX 77030

Harris County (713) 790-3311

YVONNE I-FANG CHU M.D.

Ophthalmology

6550 FANNIN ST, SUITE 1501
HOUSTON, TX 77030

Harris County (713) 798-6100

DR. SAM JERRY LONG D.D.S.

Dentist (General Practice)

6550 FANNIN ST, STE 2103
HOUSTON, TX 77030

Harris County (713) 797-0846

THOMAS W KNIGHT MD

Internal Medicine

6550 FANNIN ST, SMITH 1101
HOUSTON, TX 77030

Harris County (713) 441-0006

DR. JOOHI JIMENEZ-SHAHED M.D.

Psychiatry & Neurology (Neurology)

6550 FANNIN ST, SUITE 1801
HOUSTON, TX 77030

Harris County (713) 798-5975

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Mahmarian's NPI number?

The NPI number for John Mahmarian is 1114957511. It was assigned to this individual provider in the NPPES registry on July 3, 2006.

Where is John Mahmarian located?

John Mahmarian practices at 6550 Fannin St Smith Tower, Suite 1901, Houston, TX 77030. The listed phone number is (713) 441-1100.

What is John Mahmarian's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Cardiovascular Disease, with taxonomy code 207RC0000X.

Is John Mahmarian enrolled in Medicare?

Yes. John Mahmarian is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does John Mahmarian accept?

Health plans from Molina Healthcare and WellPoint list John Mahmarian as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is John Mahmarian affiliated with any hospitals?

According to CMS data, John Mahmarian is affiliated with Houston Methodist Hospital, Houston Methodist Sugarland Hospital and Houston Methodist West Hospital.

When was this NPI record last updated?

The NPPES record for John Mahmarian was last updated on March 7, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.