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.

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Ghassan Zalzaleh, MD

NPI 1992704035 · Hematology & Oncology Physician · Oak Lawn, IL

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)

Practice location

4400 W 95th St

Suite 311

Oak Lawn, IL 60453-2654

Phone: (708) 424-9710

Fax: (708) 424-4331

Street-level locationGet directions

More IL providers

Mailing address

62647 Collection Center Dr

Chicago, IL 60693-0626

Specialties & taxonomies

Hematology & Oncology PhysicianPrimary207RH0003XLicense 036089713 (IL)
Allopathic & Osteopathic Physicians

Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(86/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure25% of score
21 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 methodology.

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.

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.

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)

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Frequently asked questions

Profile Score

What this provider does (Medicare)

What this provider prescribes (Medicare Part D)

Transparency — industry payments