MATTHIAS WEISS (MD) – Hematology & Oncology Physician, NPI 1245336759
Hematology & Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
350 HEMATOLOGY/ONCOLOGY in WI
Provider Addresses for MATTHIAS WEISS (MD)
700 WEST AVE S
LA CROSSE, WI 546014783
Phone: (608) 785-0940
Type: Location
1818 N Meade St
Suite W120
Appleton, WI 549113454
Phone: (920) 735-7300
Fax: (920) 735-7333
Type: Location
200 1ST ST SW
ROCHESTER, MN 559050002
Phone: (608) 785-0940
Type: Mailing
Mitchell F. Lundgaard Post Office, Sherman Place, Appleton, Outagamie County, Wisconsin, 54911, United States
APPLETON, WI 549128003
Phone: (920) 830-5900
Fax: (920) 830-5970
Type: Mailing
ThedaCare Regional Medical Center-Appleton, 1818, North Meade Street, Erb Park, Appleton, Outagamie County, Wisconsin, 54911, United States
SUITE W120
APPLETON, WI 549113454
Phone: (920) 735-7300
Fax: (920) 735-7333
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $249.
Total Amount is formed as General ($249) + Research ($0) + Ownership ($0) = $249.
Last reported payment date: 2024-11-19 • Largest payer in this snapshot: Tempus AI, Inc ($249).
Total Amount
$249
General + Research + Ownership
Payments
4
Total payment records
General Amount
$249
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-11-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Tempus AI, Inc | $249 |
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: 2010-06-23
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 |
|---|---|---|---|---|
| I20100623000197 | I | Hematology/Oncology | WI | 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 54601)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | WI | |
| Family Practice | WI | |
| - | FL | |
| Hospitalist, Internal Medicine | MI | |
| P S Y C H I A T R Y | WI | |
| - | WI | |
| - | WA | |
| Physician Assistant | WI | |
| Family Practice | WI | |
| Nurse Practitioner | WI |
Reviews
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