William Mayo, APRN
NPI 1558817809 · Family Nurse Practitioner · Clemson, SC
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Mayo, APRN is a Family Nurse Practitioner provider in Clemson, SC (NPI 1558817809).
Provider details
- NPI number
- 1558817809
- Entity type
- Individual
- Primary specialty
- Family Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APRN
- Sex
- Male
- Sole proprietor
- No
- License
- 20201 (SC)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
9 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 84 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 185 | 67 |
| Losartan Potassium | 182 | 79 |
| Hydrochlorothiazide | 149 | 62 |
| Pantoprazole Sodium | 123 | 49 |
| Simvastatin | 122 | 58 |
| Amlodipine Besylate | 104 | 45 |
| Levothyroxine Sodium | 101 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,429 across 83 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
Mailing address
Registry dates
- Enumerated
- 2016-08-28
- Last updated
- 2016-08-28
Frequently asked questions
- What is William Mayo's NPI number?
- William Mayo's National Provider Identifier (NPI) is 1558817809, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mayo's specialty?
- William Mayo is listed in the NPPES registry with a primary specialty of Family Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is William Mayo located?
- William Mayo's practice location on file with NPPES is 101 Edwards Hall, Clemson, SC 29634-0742.
- What is William Mayo's phone number?
- The practice phone number listed in the NPPES registry for William Mayo is (864) 656-3076.
- Does William Mayo accept Medicare?
- William Mayo is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Mayo's NPI active?
- Yes — William Mayo's NPI (1558817809) is active in the NPPES registry as of the last update on 2016-08-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.