LEONARD M KLEIN – Hematology & Oncology Physician, NPI 1255328878
Hematology & Oncology Physician
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NPPES metrics only — not quality of care.
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Provider Addresses for LEONARD M KLEIN
Golf Road, Skokie, Niles Township, Cook County, Illinois, 60025, United States
NILES, IL 607145905
Phone: (847) 827-9060
Fax: (847) 827-7196
Type: Location
25070 NETWORK PL
CHICAGO, IL 606731250
Phone: (847) 585-7000
Fax: (847) 240-0622
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 $245.
Total Amount is formed as General ($245) + Research ($0) + Ownership ($0) = $245.
Last reported payment date: 2024-08-05 • Largest payer in this snapshot: PFIZER INC. ($45).
Total Amount
$245
General + Research + Ownership
Payments
11
Total payment records
General Amount
$245
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-05
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: 2009-12-31
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 |
|---|---|---|---|---|
| I20091231000478 | I | Hematology/Oncology | 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 |
|---|---|---|---|---|
| J9144 | Injection, daratumumab, 10 mg and hyaluronidase-fihj | 12,240 | 16 | $0 |
| J0897 | Injection, denosumab, 1 mg | 2,520 | 12 | $0 |
| J2469 | Injection, palonosetron hcl, 25 mcg | 640 | 15 | $0 |
| J1100 | Injection, dexamethasone sodium phosphate, 1 mg | 635 | 19 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 326 | 124 | $0 |
Insurance plans in this area (ZIP 60714)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Hematology/Oncology, Hematology | IL | |
| Nurse Practitioner | IL | |
| Medical Oncology | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL | |
| Medical Oncology, Internal Medicine | IL | |
| Hematology/Oncology, Internal Medicine | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL |
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