CHRISTOPHER GREB (MD) – Allergy & Immunology (Internal Medicine) Physician, NPI 1134623895
Allergy & Immunology (Internal Medicine) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
220 ALLERGY/IMMUNOLOGY in IL
Provider Addresses for CHRISTOPHER GREB (MD)
1725 W HARRISON STREET STE 970
CHICAGO, IL 606123828
Phone:
Type: Mailing
2160 S 1st Ave
Maywood, IL 601533328
Phone: (888) 584-7888
Type: Location
500 S Preston St Rm 305
Louisville, KY 402021702
Phone: (502) 852-8696
Type: Location
2160, South 1st Avenue, Maywood, Proviso Township, Cook County, Illinois, 60153, United States
MAYWOOD, IL 601533328
Phone: (888) 584-7888
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 11 Open Payments records for all available years, with a total value of $1,032.
Total Amount is formed as General ($1,032) + Research ($0) + Ownership ($0) = $1,032.
Last reported payment date: 2024-12-12 • Largest payer in this snapshot: AstraZeneca Pharmaceuticals LP ($471).
Total Amount
$1,032
General + Research + Ownership
Payments
11
Total payment records
General Amount
$1,032
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-12
Latest reported date
Top Companies
Largest payers in this snapshot
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: 2025-09-05
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 |
|---|---|---|---|---|
| I20250905003609 | I | Allergy/Immunology | 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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 60612)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| General Surgery | IL | |
| Internal Medicine | IL | |
| Diagnostic Radiology | WI | |
| Internal Medicine | MI | |
| Hematology/Oncology, Hospice/Palliative Care | IL | |
| Nurse Practitioner | IL | |
| O B S T E T R I C S/ G Y N E C O L O G Y | OH | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| O T O L A R Y N G O L O G Y | CT |
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