William Mazur, M.D.
NPI 1518250828 · Infectious Disease Physician · Wilmington, DE
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mazur, M.D. is a Infectious Disease Physician provider in Wilmington, DE (NPI 1518250828).
Provider details
- NPI number
- 1518250828
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- C1-0008683 (DE)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
53 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 23 | $119 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 17 | $176 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 13 | $141 |
Typical Medicare-allowed amounts for these services range $119–$176 (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 · 26 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bictegrav/Emtricit/Tenofov Alabrand: Biktarvy | 352 | 55 |
| Darunavir/Cobicistatbrand: Prezcobix | 96 | — |
| Dolutegravir/Rilpivirinebrand: Juluca | 89 | — |
| Dolutegravir Sodium/Lamivudinebrand: Dovato | 87 | 11 |
| Abacavir/Dolutegravir/Lamivudibrand: Triumeq | 85 | 14 |
| Rosuvastatin Calcium | 81 | 25 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2011-05-19
- Last updated
- 2014-11-04
Frequently asked questions
- What is William Mazur's NPI number?
- William Mazur's National Provider Identifier (NPI) is 1518250828, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mazur's specialty?
- William Mazur is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is William Mazur located?
- William Mazur's practice location on file with NPPES is 1400 N Washington St, Wilmington, DE 19801-1024.
- What is William Mazur's phone number?
- The practice phone number listed in the NPPES registry for William Mazur is (302) 320-1300.
- Does William Mazur accept Medicare?
- William Mazur is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mazur's NPI active?
- Yes — William Mazur's NPI (1518250828) is active in the NPPES registry as of the last update on 2014-11-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.