MARK ANDREW WALSHAUSER (M.D.) – Hematology & Oncology Physician, NPI 1306020664
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
727 HEMATOLOGY/ONCOLOGY in IL
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Provider Addresses for MARK ANDREW WALSHAUSER (M.D.)
1, Wolf Creek Drive, Swansea, Saint Clair County, Illinois, 62226, United States
SWANSEA, IL 622262367
Phone: (618) 416-7970
Type: Mailing
321 REGENCY PARK STE 100
O FALLON, IL 622691887
Phone: (618) 416-7970
Fax: (618) 416-7971
Type: Location
Broadway Plaza Suite 1
Sparta, IL 622861800
Phone: (618) 416-7970
Fax: (618) 416-7971
Type: Location
12860 Troxler Ave Ste 135
Highland, IL 622492898
Phone: (618) 416-7970
Fax: (618) 416-7971
Type: Location
PO BOX 25228
DECATUR, IL 625255228
Phone: (217) 329-3232
Fax: (217) 233-1670
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 189 Open Payments records for all available years, with a total value of $11,578.
Total Amount is formed as General ($11,578) + Research ($0) + Ownership ($0) = $11,578.
Last reported payment date: 2024-12-16 • Largest payer in this snapshot: Regeneron Pharmaceuticals, Inc. ($3,833).
Total Amount
$11,578
General + Research + Ownership
Payments
189
Total payment records
General Amount
$11,578
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-16
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Regeneron Pharmaceuticals, Inc. | $3,833 |
| BeiGene USA, Inc. | $2,322 |
| AstraZeneca Pharmaceuticals LP | $606 |
| E.R. Squibb & Sons, L.L.C. | $386 |
| PFIZER INC. | $353 |
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: 2014-07-11
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Past revalidation due date
Earliest CMS due date was 2023-07-31 (1043 days ago).
Enrollment records
1
Earliest due date
2023-07-31
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 |
|---|---|---|---|---|
| I20140711000552 | I | Hematology/Oncology | IL | 2023-07-31 |
What to do next
- Verify current status on the CMS Revalidation Lookup Tool immediately.
- Complete revalidation in PECOS or contact your Medicare Administrative Contractor (MAC).
- Overdue revalidation can lead to deactivation of Medicare billing privileges.
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 |
|---|---|---|---|---|
| J1439 | Injection, ferric carboxymaltose, 1 mg | 43,500 | 28 | $0 |
| Q9967 | Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 14,300 | 74 | $0 |
| J1100 | Injection, dexamethasone sodium phosphate, 1 mg | 2,687 | 37 | $0 |
| J2469 | Injection, palonosetron hcl, 25 mcg | 1,520 | 22 | $0 |
| 96375 | Injection of additional new drug or substance into vein | 1,118 | 54 | $0 |
Insurance plans in this area (ZIP 62226)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | IL | |
| Nurse Practitioner | 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 | |
| Hematology/Oncology, Internal Medicine | IL | |
| H E M A T O L O G Y/ O N C O L O G Y | IL |
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