PAUL J WARREN (MD) – Nephrology Physician, NPI 1487646477
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
239 NEPHROLOGY in WI
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Provider Addresses for PAUL J WARREN (MD)
Fresenius Medical Care, 3120, South 27th Street, Southgate, Milwaukee, Milwaukee County, Wisconsin, 53154, United States
MILWAUKEE, WI 53215
Phone: (414) 672-8282
Fax: (414) 672-8282
Type: Location
335 MAHN COURT
OAK CREEK, WI 53154
Phone: (414) 762-2020
Fax: (414) 762-2024
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $45.
Total Amount is formed as General ($45) + Research ($0) + Ownership ($0) = $45.
Last reported payment date: 2024-10-18 • Largest payer in this snapshot: AKEBIA THERAPEUTICS INC ($25).
Total Amount
$45
General + Research + Ownership
Payments
2
Total payment records
General Amount
$45
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-10-18
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| AKEBIA THERAPEUTICS INC | $25 |
| Baxter Healthcare | $21 |
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: 2010-08-24
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 |
|---|---|---|---|---|
| I20100824000957 | I | Nephrology | 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 |
|---|---|---|---|---|
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 567 | 216 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 545 | 326 | $0 |
| 90970 | Dialysis services, per day, less than full month service (20 years or older) | 517 | 18 | $0 |
| 90960 | Dialysis services, 4 or more physician visits per month (20 years or older) | 356 | 55 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 172 | 85 | $0 |
Insurance plans in this area (ZIP 53215)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| N E P H R O L O G Y | MI | |
| N E P H R O L O G Y | WI | |
| - | WI | |
| N E P H R O L O G Y | IL | |
| N E P H R O L O G Y | WI | |
| Physician Assistant | WI | |
| N E P H R O L O G Y | WI | |
| - | WI | |
| Nurse Practitioner | WI | |
| N E P H R O L O G Y | WI |
Reviews
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