William Patrick Mazur, M.D.
Infectious Disease Internal Medicine
William Patrick Mazur is an Infectious Disease Internal Medicine specialist based in Wilmington, DE with over 30 years of clinical experience. Medicare-enrolled per CMS records and offers virtual telehealth visits.
Also practices: INTERNAL MEDICINE
William Patrick Mazur, M.D. practices as part of a group infectious disease specialist practice in Wilmington, DE. With 30+ years of experience, he has been practicing in the Wilmington area. Among his Medicare patients, common conditions include hypertension, high cholesterol, and kidney disease (per CMS data).
Older · 4218dNPPES updated 2014-11-04 · verify NPI on CMS · Verify license at Delaware Board of Medical Licensure & Discipline
Contact & Location
Practice Location
1400 N Washington St, Wilmington, DE 19801-1024
How Does This Doctor Compare?
Generic Rx
↑ Higher = better20.2%
Delaware avg: 84.9 · US avg: 82.8
⚠ Lower than most doctors nationally(-62.6 pts)
How often this doctor prescribes affordable generic drugs instead of expensive brand-name ones.
Medicare Patients
41
Unique beneficiaries
Boutique practicePrescription Recipients
99
Patients prescribed
Prescriptions Written
1,046
Total claims
Total Medicare drug cost: $3.13M
Percentile rankings compared against 134 reporting peers in Delaware.
Data Note: Sourced from CMS Medicare Provider Utilization & Payment Data. Percentile rankings compare this provider against all peers with reported data in the same state. Updated annually to reflect the latest federal reporting cycle.
What This Doctor Treats Most
Based on Medicare claims data — here's what patients commonly see this doctor for
Based on Medicare data, this doctor primarily manages Hypertension, High Cholesterol, and Chronic Kidney Disease.
High blood pressure — a leading risk factor for heart disease and stroke
US avg: 70.2%↑ More patients than average (+3%) — a focus area for this doctor
Elevated cholesterol or triglycerides that increase heart disease risk
US avg: 70.4%↓ Fewer patients than average (-4%) — less common here
Gradual loss of kidney function over time, often linked to diabetes or hypertension
US avg: 29.6%↑ More patients than average (+9%) — a focus area for this doctor
Joint inflammation causing pain, swelling, and stiffness
US avg: 49.3%↓ Fewer patients than average (-15%) — less common here
A condition where the body cannot properly regulate blood sugar levels
US avg: 34.5%↓ Fewer patients than average (-2%) — less common here
Percentage of this provider's Medicare patients diagnosed with each condition. Source: CMS Utilization Data.
$15 received from industry
1 transaction reported in 2018 ·Low tier
Payments include consulting fees, speaking honoraria, food & beverage, travel, research support, and ownership interests from drug and medical device manufacturers. Disclosure is required by the federal Physician Payments Sunshine Act. These payments do not necessarily indicate conflicts of interest. National median: $338 across 136 000 tracked providers.
Tiers — Low: under $500 · Moderate: $500-5 000 · High: $5 000-25 000 · Very High: $25 000+. Source: CMS Open Payments 2018, attributed to William Patrick Mazur's NPI.
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Background & Specialty
Education, training, and specialty classification from CMS NPPES and Medicare records.
30 years in practice
Senior practitioner
Infectious disease specialists diagnose and treat complex infections including HIV/AIDS, hepatitis, tuberculosis, antibiotic-resistant infections (MRSA), post-surgical infections, and travel-related illnesses. They also provide pre-travel vaccination counseling and manage infections in immunocompromised patients.
Taxonomy: 207RI0200X
Primary hospital affiliation: Acute Care Hospitals
CMS Certification Number: 490007
View hospital on Medicare Care CompareVirtual Infectious Disease Care With William Patrick Mazur
NPPES records indicate this provider offers telehealth services. Contact the office to confirm availability and scheduling.
Schedule a virtual visit with William Patrick Mazur for blood pressure monitoring, cholesterol management, kidney care follow-ups — no travel to Wilmington required. The office sends a secure video link before your appointment. Most visits take 15–30 minutes. Medicare enrolled per CMS records.
Frequently Asked Questions
Common questions about William Patrick Mazur
NPI records show Dr. Mazur as active with telehealth listed in Wilmington, DE. NPI status alone doesn't confirm open availability — call the office to confirm. Phone: (302) 320-1300.
Sourced from CMS NPPES · OIG LEIE · CMS Medicare Part D · CMS Open Payments 2018 · CMS Physician Comparator. See Data Methodology.
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Contact William Patrick Mazur
Practice Location
1400 N Washington St, Wilmington, DE 19801-1024
Mailing Address
1400 N Washington St, Wilmington, DE 19801-1024
This is a provider directory. Contact the office directly to schedule appointments.
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