JOHN CHARLES ISAAC (M.D.) – Interventional Cardiology Physician, NPI 1295799005
Interventional Cardiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,430 CARDIOVASCULAR DISEASE (CARDIOLOGY) in TX
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Provider Addresses for JOHN CHARLES ISAAC (M.D.)
Houston Methodist - Scurlock Tower, 6560, Fannin Street, Texas Medical Center, Houston, Harris County, Texas, 77030, United States
STE 620
HOUSTON, TX 770302761
Phone: (713) 791-1978
Fax: (713) 791-1870
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 796 Open Payments records for all available years, with a total value of $339,384.
Total Amount is formed as General ($339,384) + Research ($0) + Ownership ($0) = $339,384.
Last reported payment date: 2024-12-27 • Largest payer in this snapshot: Amgen Inc. ($55,566).
Total Amount
$339,384
General + Research + Ownership
Payments
796
Total payment records
General Amount
$339,384
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-27
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Amgen Inc. | $55,566 |
| Esperion Therapeutics, Inc. | $50,449 |
| Kiniksa Pharmaceuticals International, plc | $48,405 |
| E.R. Squibb & Sons, L.L.C. | $30,003 |
| AstraZeneca Pharmaceuticals LP | $26,498 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-12-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20051212000547 | I | Cardiovascular Disease (Cardiology) | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 2,306 | 1,068 | $0 |
| J2785 | Injection, regadenoson, 0.1 mg | 1,860 | 465 | $0 |
| 93306 | Ultrasound of heart with color-depicted blood flow, rate, direction and valve function | 753 | 714 | $0 |
| 93298 | Evaluation of cardiac rhythm monitor system, remote up to 30 days | 710 | 91 | $0 |
| G2066 | Interrogation device evaluation(s), (remote) up to 30 days; implantable cardiovascular physiologic monitor system, implantable loop recorder system, or subcutaneous cardiac rhythm monitor system, remote data acquisition(s), receipt of transmissions and tec | 709 | 90 | $0 |
Insurance plans in this area (ZIP 77030)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| CARDIOVASCULAR DISEASE (CARDIOLOGY) | TX | 85610 | Blood test, clotting time | 277 | 47 |
| CARDIOVASCULAR DISEASE (CARDIOLOGY) | TX | 93458 | Insertion of catheter in left heart for imaging of blood vessels or grafts and left lower heart | 18 | 17 |
| CARDIOVASCULAR DISEASE (CARDIOLOGY) | TX | 93922 | Ultrasound study of arteries of both arms and legs | 20 | 18 |
| CARDIOVASCULAR DISEASE (CARDIOLOGY) | TX | 93971 | Ultrasound scan of veins of one arm or leg or limited including assessment of compression and functional maneuvers | 19 | 17 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Cardiovascular Disease (Cardiology) | TX | |
| - | TX | |
| - | TX | |
| Cardiac Electrophysiology | TX | |
| Cardiovascular Disease (Cardiology), Interventional Cardiology | TX | |
| Cardiovascular Disease (Cardiology), Cardiac Electrophysiology | TX | |
| Physician Assistant | TX | |
| Internal Medicine, Cardiovascular Disease (Cardiology) | TX | |
| Cardiovascular Disease (Cardiology), Interventional Cardiology | TX | |
| Cardiovascular Disease (Cardiology), Internal Medicine, Interventional Cardiology | TX |
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