Mazen Zaarour, M.D.
NPI 1437599875 · Hematology & Oncology Physician · Winter Garden, FL
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mazen Zaarour, M.D. is a Hematology & Oncology Physician provider in Winter Garden, FL (NPI 1437599875).
Provider details
- NPI number
- 1437599875
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 37907 (AL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
12 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
539 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 189 | $130 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 184 | $88 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 49 | $62 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 39 | $58 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 28 | $118 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 29 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Letrozole | 147 | 24 |
| Ondansetron Hcl | 63 | 47 |
| Prednisone | 52 | 11 |
| Abiraterone Acetate | 48 | — |
| Oxycodone Hcl | 33 | 15 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | 12 |
| Lenalidomide | 29 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,073 across 106 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-06-30
- Last updated
- 2025-11-17
- Certified
- 2025-11-17
Frequently asked questions
- What is Mazen Zaarour's NPI number?
- Mazen Zaarour's National Provider Identifier (NPI) is 1437599875, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mazen Zaarour's specialty?
- Mazen Zaarour is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Mazen Zaarour located?
- Mazen Zaarour's practice location on file with NPPES is 2000 Fowler Grove Blvd # 3, Winter Garden, FL 34787-5050.
- What is Mazen Zaarour's phone number?
- The practice phone number listed in the NPPES registry for Mazen Zaarour is (407) 609-7510.
- Does Mazen Zaarour accept Medicare?
- Mazen Zaarour is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mazen Zaarour's NPI active?
- Yes — Mazen Zaarour's NPI (1437599875) is active in the NPPES registry as of the last update on 2025-11-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.