WILLIAM P MUSTAS (P.A.) – Physician Assistant, NPI 1629080932
Physician Assistant
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
3,672 PHYSICIAN ASSISTANT in WI
Provider Addresses for WILLIAM P MUSTAS (P.A.)
1111 DELAFIELD ST STE 215
WAUKESHA, WI 531883403
Phone: (262) 542-0074
Fax: (262) 542-2803
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 78 Open Payments records for all available years, with a total value of $2,087.
Total Amount is formed as General ($2,087) + Research ($0) + Ownership ($0) = $2,087.
Last reported payment date: 2024-06-19 • Largest payer in this snapshot: Astellas Pharma US Inc ($605).
Total Amount
$2,087
General + Research + Ownership
Payments
78
Total payment records
General Amount
$2,087
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-06-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Astellas Pharma US Inc | $605 |
| Janssen Biotech, Inc. | $367 |
| Halozyme Inc | $250 |
| PFIZER INC. | $211 |
| Sumitomo Pharma America, Inc. | $136 |
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: 2025-02-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20200320002377 | I | Physician Assistant | WI | TBD |
| I20250212001475 | I | Physician Assistant | NM | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 146 | 87 | $0 |
| 81003 | Automated urinalysis test | 52 | 39 | $0 |
| 51798 | Ultrasound measurement of bladder capacity after voiding | 39 | 34 | $0 |
| 99221 | Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes | 31 | 30 | $0 |
| 99203 | New patient office or other outpatient visit, 30-44 minutes | 28 | 28 | $0 |
Insurance plans in this area (ZIP 53188)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| O B S T E T R I C S/ G Y N E C O L O G Y | MI | |
| Gastroenterology, Internal Medicine | AZ | |
| Nurse Practitioner | NM | |
| General Surgery | LA | |
| General Surgery | OH | |
| Family Practice | NM | |
| Gastroenterology, Internal Medicine | FL | |
| Orthopedic Surgery | NM | |
| General Surgery | NM | |
| O B S T E T R I C S/ G Y N E C O L O G Y | OH |
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