William Mazzella, MD
NPI 1528158227 · Hospitalist Physician · Greenville, SC
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mazzella, MD is a Hospitalist Physician provider in Greenville, SC (NPI 1528158227).
Provider details
- NPI number
- 1528158227
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 200101093 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
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
7 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
566 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 191 | $110 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 139 | $106 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 125 | $73 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 62 | $163 |
| Critical Care, First 30-74 Minutes99291 | 36 | $200 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 13 | $76 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Empagliflozinbrand: Jardiance | 32 | 15 |
| Prednisone | 30 | 25 |
| Levofloxacin | 28 | 28 |
| Gabapentin | 21 | 20 |
| Amlodipine Besylate | 20 | 19 |
| Rosuvastatin Calcium | 20 | — |
| Doxycycline Hyclate | 18 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$12 across 1 record (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
Mailing address
Additional practice locations (6)
- 11109 Parkview Plaza DrFort Wayne, IN 46845-1701Phone: (260) 266-2020
- 7777 Hennessy Blvd Ste 701Baton Rouge, LA 70808-4370Phone: (225) 765-5864Fax: (225) 765-2013
- 5000 Hennessy BlvdBaton Rouge, LA 70808-4375Phone: (225) 765-5864Fax: (225) 765-2013
- 309 Jackson StMonroe, LA 71201-7407Phone: (318) 966-4541Fax: (318) 966-4543
- 19 Maxwell RdChapel Hill, NC 27517-4043Phone: (704) 709-9362
- 601 N Elm StHigh Point, NC 27262-4331Phone: (336) 716-2255
Registry dates
- Enumerated
- 2006-10-13
- Last updated
- 2023-01-31
- Certified
- 2023-01-31
Frequently asked questions
- What is William Mazzella's NPI number?
- William Mazzella's National Provider Identifier (NPI) is 1528158227, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mazzella's specialty?
- William Mazzella is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is William Mazzella located?
- William Mazzella's practice location on file with NPPES is 701 Grove Rd Fl 5, Greenville, SC 29605-4210.
- What is William Mazzella's phone number?
- The practice phone number listed in the NPPES registry for William Mazzella is (864) 455-4411.
- Does William Mazzella accept Medicare?
- William Mazzella is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mazzella's NPI active?
- Yes — William Mazzella's NPI (1528158227) is active in the NPPES registry as of the last update on 2023-01-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.