DR. HASSAN I. TAHSILDAR (M.D.) – Medical Oncology Physician, NPI 1629067269
Medical Oncology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
121 MEDICAL ONCOLOGY in WI
Provider Addresses for DR. HASSAN I. TAHSILDAR (M.D.)
2820 Roosevelt Rd
Marinette, WI 541433834
Phone: (715) 735-5225
Fax: (715) 735-5388
Type: Location
744 S Webster Ave
Green Bay, WI 543013505
Phone: (920) 433-3500
Fax: (920) 445-7301
Type: Location
PO box, Russell Road, Paoli, Tredyffrin Township, Chester County, Pennsylvania, 19301, United States
GREEN BAY, WI 543052487
Phone: (920) 445-7222
Fax: (920) 445-7289
Type: Mailing
1580, Commanche Avenue, Ashwaubenon, Brown County, Wisconsin, 54313, United States
GREEN BAY, WI 543135751
Phone: (920) 435-8326
Type: Location
820 Arbutus Ave
Oconto, WI 541532004
Phone: (920) 835-1100
Fax: (920) 835-1099
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $80.
Total Amount is formed as General ($80) + Research ($0) + Ownership ($0) = $80.
Last reported payment date: 2024-07-29 • Largest payer in this snapshot: JAZZ PHARMACEUTICALS INC. ($54).
Total Amount
$80
General + Research + Ownership
Payments
3
Total payment records
General Amount
$80
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-29
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| JAZZ PHARMACEUTICALS INC. | $54 |
| Celgene Corporation | $26 |
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: 2010-12-07
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 |
|---|---|---|---|---|
| I20101207001253 | I | Medical 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.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 180 | 96 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 19 | 18 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 17 | 17 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 17 | 17 | $0 |
Insurance plans in this area (ZIP 54143)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | WI | |
| Nurse Practitioner | WI | |
| - | WI | |
| - | WI | |
| O B S T E T R I C S/ G Y N E C O L O G Y | WI | |
| Nurse Practitioner | WI | |
| E N D O C R I N O L O G Y | WI | |
| - | WI | |
| - | WI | |
| Nurse Practitioner | WI |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.