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WILLIAM WORRALL MAYO APRN
NPI 1558817809
Nurse Practitioner - Family in Clemson, SC

Active since August 28, 2016PECOS EnrolledAccepts Medicare Assignment
101 EDWARDS HALL, CLEMSON, SC 29634(864) 656-3076(864) 656-1123 Get Directions Write a Review

NPPES record last updated: August 28, 2016. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About William Worrall Mayo Aprn NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM WORRALL MAYO APRN (NPI 1558817809) is an individual family provider in Clemson, South Carolina, licensed in South Carolina (20201) and active in the NPI registry since August 2016. He is enrolled in Medicare PECOS, is affiliated with Margaret R Pardee Memorial Hospital, and is a graduate of Other (2016).

NPPES Registry Identity

NPI1558817809
Entity TypeIndividualMale
Primary Taxonomy363LF0000X
Provider Legal NameWILLIAM WORRALL MAYOCredential: APRN
Location Address101 EDWARDS HALLClemson, SC 29634-0742
Mailing Address101 Edwards HallClemson, SC 29634-0742 · (864) 656-3076 · Fax (864) 656-1123
Phone(864) 656-3076
Fax(864) 656-1123
Sole ProprietorNo
Medical School CMSOtherGraduated 2016
Enumeration DateAugust 28, 2016
✔ NPI 1558817809 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in SC · 20201
101 EDWARDS HALL, Clemson, SC 29634
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cigna Healthcare, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William Worrall Mayo Aprn is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4082033386
PECOS Enrollment IDI20231109000078
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show William Mayo reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Clemson University
15 mi
Family
200 BOOKER DR
Walhalla, SC 29691
  • Reassigned Medicare billing, South Carolina enrollment
  • 17 clinicians in this Medicare group
NPI 1093990707 (864) 656-1969
James J. Caserio, M.D., PA
49 mi
Internal Medicine
547 N JUSTICE ST
Hendersonville, NC 28739
  • Reassigned Medicare billing, North Carolina enrollment
  • Medicare enrollment name: James J Caserio MD PA
  • 2 clinicians in this Medicare group
NPI 1992819056 (828) 692-5096

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Margaret R Pardee Memorial Hospital

Acute Care Hospitals · Hendersonville, NC
5/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number340017
Location800 N Justice StHendersonville, NC 28791 · Henderson County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 29634 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$83.18 typical visit price
range $53.57 – $163.84
Typical copayment $20.79 (range $13.39 – $40.96)
Most-billed visit code 99203
Established Patient
$95.12 typical visit price
range $16.96 – $133.52
Typical copayment $23.78 (range $4.24 – $33.38)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MRS. WHITNEY WILLIAMS NP-C
Nurse Practitioner (Family)
101 EDWARDS HALL
CLEMSON, SC 29634
Pickens County (864) 656-3076
PAULA J WATT PHD, APRN-BC, FNP
Nurse Practitioner (Family)
101 EDWARDS HALL
CLEMSON, SC 29634
Pickens County (864) 656-3076
CAITLIN A MOORE APRN
Nurse Practitioner (Family)
101 EDWARDS HALL
CLEMSON, SC 29634
Pickens County (864) 656-3076

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Mayo's NPI number?

The NPI number for William Mayo is 1558817809. It was assigned to this individual provider in the NPPES registry on August 28, 2016.

Where is William Mayo located?

William Mayo practices at 101 Edwards Hall, Clemson, SC 29634. The listed phone number is (864) 656-3076.

What is William Mayo's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is William Mayo enrolled in Medicare?

Yes. William Mayo is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for William Mayo's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Mayo reassigns Medicare benefits to 2 organizations: Clemson University (Walhalla, SC) and James J. Caserio, M.D., PA (Hendersonville, NC). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for William Mayo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Mayo accept?

Health plans from Cigna Healthcare and UnitedHealthcare list William Mayo as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Mayo affiliated with any hospitals?

According to CMS data, William Mayo is affiliated with Margaret R Pardee Memorial Hospital.

When was this NPI record last updated?

The NPPES record for William Mayo was last updated on August 28, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.