John F. Zaki, MD

Medicare activity in 2024

Official CMS public-use data for John F. Zaki, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Insertion of artery tube for blood sampling or infusion through skin (36620)34 services
2. Anesthesia for procedure to assess heart electrical activity (00537)14 services
3. Ultrasound of heart with probe in esophagus, with report (93312)12 services
4. Anesthesia for procedure on heart and large blood vessels (00560)11 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Atrial fibrillation60%
• Heart failure59%
• Ischemic heart disease58%
• Chronic kidney disease54%

Hospitals where John F. Zaki works

Medicare's Facility Affiliation Data lists John F. Zaki at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Memorial Hermann - Texas Medical CenterHouston, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · CCN 450068

Practice locations

Addresses where John F. Zaki is enrolled with Medicare (CMS data updated October 2, 2026).

• 6410 Fannin StHouston, TX 77030
• 6411 Fannin StHouston, TX 77030
• 6411 Fannin St, Suite 400Houston, TX 77030 (713) 500‑3267
• 6431 Fannin St, Msb2.100Houston, TX 77030 (713) 500‑7700

Group practices

Medicare enrollment lists John F. Zaki as a member of this group (CMS data updated October 2, 2026).

• UT Physicians1,765 clinicians in the group

Specialties

• Anesthesiologyprimary

Find other Anesthesiology doctors in Texas →

Other anesthesiologists in Houston

Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.

• Chyong-Jy J. Liu, DO
• Erin S. Williams, MD
• Ricardo Mora, MD
• Gabriel E. Mena, MD
• Abdul S. Vohra, MD
• Marcial J. Bacani, MD
• Ronald B. Easley, MD
• Kathryn B. McPherson, MD

All anesthesiologists in Houston →

Other clinicians in UT Physicians

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Tien C. Ko, MD
• Sebastian Bruera, MD
• Sami Hossri, MD
• Kristin M. Falce, MD
• Sussy A. Gonzalez, NP
• Aamir A. Abbas, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians