Ghassan Zalzaleh, MD
NPI 1992704035 · Hematology & Oncology Physician · Oak Lawn, IL
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ghassan Zalzaleh, MD is a Hematology & Oncology Physician provider in Oak Lawn, IL (NPI 1992704035).
Provider details
- NPI number
- 1992704035
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036089713 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 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
4,477 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 723 | $132 |
| Administration of Chemotherapy Into Vein, 1 Hour Or Less96413 | 493 | $132 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less96367 | 351 | $29 |
| Injection of Additional New Drug Or Substance Into Vein96375 | 296 | $16 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 294 | $17 |
| Injection of Drug Or Substance Under Skin Or Into Muscle |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 64 | 17 |
| Prednisone | 44 | 20 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 33 | 18 |
| Lenalidomidebrand: Revlimid | 28 | — |
| Imatinib Mesylate | 23 | — |
| Hydroxyurea | 21 | — |
| Abiraterone Acetate | 20 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16,185 across 199 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
- 2005-07-20
- Last updated
- 2015-07-10
Frequently asked questions
- What is Ghassan Zalzaleh's NPI number?
- Ghassan Zalzaleh's National Provider Identifier (NPI) is 1992704035, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ghassan Zalzaleh's specialty?
- Ghassan Zalzaleh is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ghassan Zalzaleh located?
- Ghassan Zalzaleh's practice location on file with NPPES is 4400 W 95th St, Oak Lawn, IL 60453-2654.
- What is Ghassan Zalzaleh's phone number?
- The practice phone number listed in the NPPES registry for Ghassan Zalzaleh is (708) 424-9710.
- Does Ghassan Zalzaleh accept Medicare?
- Ghassan Zalzaleh is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ghassan Zalzaleh's NPI active?
- Yes — Ghassan Zalzaleh's NPI (1992704035) is active in the NPPES registry as of the last update on 2015-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.