IndividualActiveAccepts Medicare

William Mustas, P.A.

NPI 1629080932 · Physician Assistant · Waukesha, WI

Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Provider details

NPI number: 1629080932
Entity type: Individual
Primary specialty: Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
Credential: P.A.
Sex: Male
Sole proprietor: Yes
License: 1307 (WI)

Specialties & taxonomies

Physician AssistantPrimary363A00000XLicense 1307 (WI)
Physician Assistants & Advanced Practice Nursing Providers

Profile Score

Established profile(72/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure25% of score
19 yrs in NPPES registry
Profile completeness25% of score
100% of core fields populated
Practice footprint15% of score
1 documented practice location
Medicare service volume (vs. specialty peers)25% of score
148 Medicare services, 2024 (ranked within specialty)
Open Payments transparency10% of score
Has Open Payments disclosures (2024)

Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .

What this provider does (Medicare)

Based on Medicare fee-for-service claims, 2024; not all care is captured.

Service (HCPCS)	Medicare services	Typical Medicare-allowed (2024)
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	76	$72
Ultrasound Measurement of Bladder Capacity After Voiding51798	33	$10
Automated Urinalysis Test81003	20	$2
Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221	19	$64

Typical Medicare-allowed amounts for these services range $2–$72 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.

What this provider prescribes (Medicare Part D)

Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Tamsulosin Hcl	183	69
Mirabegronbrand: Myrbetriq	61	14
Oxybutynin Chloridebrand: Oxybutynin Chloride Er	47	16
Vibegronbrand: Gemtesa	45	16
Ciprofloxacin Hcl	39	38
Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro	29	16
Cephalexin	27

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$604 across 30 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Practice location

1111 Delafield St Ste 215

Waukesha, WI 53188-3403

Phone: (262) 542-0074

Fax: (262) 542-2803

Street-level locationGet directions

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Mailing address