Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John Charles Isaac, MD

Individual provider Interventional Cardiology Physician · NPI 1295799005

John Charles Isaac, MD is registered under Cardiovascular Disease (Cardiology) in Houston, Texas. Graduated from University of Texas Southwestern Medical School at Dallas in 1994, 32 years ago. Practices with Houston Cardiovascular Assoc PA, a 82-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Texas.

Years since qualifying
32
Trained at
University of Texas Southwestern Medical School at Dallas
Licensed in
TX
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

6560 Fannin St Ste 620
Houston, TX 77030-2761 Not confirmed with CMS for 10 years — call before visiting
Phone: (713) 791-1978
Fax: (713) 791-1870
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Interventional Cardiology Physician (primary) Taxonomy 207RI0011X · Licence K4090 (TX)
Cardiovascular Disease Physician Taxonomy 207RC0000X · Licence K4090 (TX)

Record details

NPI number1295799005
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 17, 2006
Last updated in NPPESOctober 25, 2016

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolUNIVERSITY OF TEXAS SOUTHWESTERN MEDICAL SCHOOL AT DALLAS
Graduated 1994 (32 years in practice)
Group practice Houston Cardiovascular Assoc Pa — 82 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Coronary angioplasty and stenting 19 times · 47th percentile
Pacemaker insertion or repair 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients1,253
Services billed 9,530 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $171,043 77 payments
Travel and Lodging $19,031 127 payments · travel or lodging paid or reimbursed, such as to attend a conference
Consulting Fee $15,908 3 payments
Food and Beverage $8,374 175 payments · a meal or drink at a meeting or visit, not a fee
Education $20 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Houston Cardiovascular Assoc PA

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 82 clinicians in the practice; 12 are shown here.

Other providers in Houston