GHASSAN ZALZALEH (MD) – Hematology & Oncology Physician, NPI 1992704035
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
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Provider Addresses for GHASSAN ZALZALEH (MD)
62647 COLLECTION CENTER DR
CHICAGO, IL 606930626
Phone: (815) 895-2144
Fax: (630) 789-1432
Type: Mailing
Advocate Christ Medical Center, 4400, West 95th Street, Oak Lawn, Worth Township, Cook County, Illinois, 60453, United States
SUITE 311
OAK LAWN, IL 604532654
Phone: (708) 424-9710
Fax: (708) 424-4331
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 343 Open Payments records for all available years, with a total value of $23,832.
Total Amount is formed as General ($23,832) + Research ($0) + Ownership ($0) = $23,832.
Last reported payment date: 2024-12-27 • Largest payer in this snapshot: EMD Serono, Inc. ($11,001).
Total Amount
$23,832
General + Research + Ownership
Payments
343
Total payment records
General Amount
$23,832
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-27
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| EMD Serono, Inc. | $11,001 |
| Bayer Healthcare Pharmaceuticals Inc. | $4,454 |
| Karyopharm Therapeutics Inc. | $1,100 |
| Janssen Biotech, Inc. | $519 |
| PFIZER INC. | $301 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-09-30
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040930000994 | I | Internal Medicine | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| J9271 | Injection, pembrolizumab, 1 mg | 39,200 | 40 | $0 |
| J1439 | Injection, ferric carboxymaltose, 1 mg | 30,000 | 29 | $0 |
| J1453 | Injection, fosaprepitant, 1 mg | 23,850 | 53 | $0 |
| Q5110 | Injection, filgrastim-aafi, biosimilar, (nivestym), 1 microgram | 17,940 | 15 | $0 |
| J0881 | Injection, darbepoetin alfa, 1 microgram (non-esrd use) | 16,200 | 11 | $0 |
Insurance plans in this area (ZIP 60693)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Internal Medicine, Hematology/Oncology | IL | |
| Gynecological Oncology | IL | |
| Gynecological Oncology, Obstetrics/Gynecology | IL | |
| Hematology/Oncology, Internal Medicine | IL | |
| Radiation Oncology | IL | |
| Radiation Oncology | IL | |
| Physician Assistant | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL | |
| - | IL | |
| - | IL |
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