Quick answers
- Does Nadim M. Zacca accept Medicare assignment?
- Yes. Medicare's clinician data says Nadim M. Zacca accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Nadim M. Zacca see?
- In 2024, CMS data shows 280 Original Medicare patients and 3,997 services for Nadim M. Zacca. This counts Original Medicare only and measures volume, not quality.
- What is Nadim M. Zacca's NPI number?
- 1114019346. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Nadim M. Zacca, 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.
| Original Medicare patients | 280 |
|---|---|
| Services billed to Medicare | 3,997 |
| Different services or procedures | 29 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, adenosine, 1 mg (not to be used to report any adenosine phosphate compounds) (J0153)1,980 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)640 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)220 services
- Injection, regadenoson, 0.1 mg (J2785)145 services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)133 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%
- Ischemic heart disease56%
- Diabetes53%
- Chronic kidney disease49%
- Heart failure49%
Hospitals where Nadim M. Zacca works
Medicare's Facility Affiliation Data lists Nadim M. Zacca 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.
- Houston Methodist HospitalHouston, TX · Acute Care Hospital · Medicare rating: 5 of 5 stars · CCN 450358
Practice locations
Addresses where Nadim M. Zacca is enrolled with Medicare (CMS data updated October 2, 2026).
- 6550 Fannin St, Suite 2229Houston, TX 77030
- 6550 Fannin St, Suite 2427Houston, TX 77030 (713) 795‑4059
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Texas →
Other cardiologists in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1979 (47 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114019346 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians