DR. WILLIAM STEWART HORSLEY M.D.
NPI 1841341369
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Florence, SC
About Dr. William Stewart Horsley M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM STEWART HORSLEY M.D. (NPI 1841341369) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Florence, South Carolina, licensed in South Carolina (97964) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS, is affiliated with Baptist Health Medical Center - Jacksonville, and maintains 5 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 5
Other Identifiers 1
Accepted 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
Dr. William Stewart Horsley M.d. 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.
Medicare Billing Reassignments
5Medicare enrollment records show William Horsley reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Jacksonville, FL 32204
- Reassigned Medicare billing, Florida enrollment
- 102 clinicians in this Medicare group
Munford, AL 36268
- Reassigned Medicare billing, Alabama enrollment
- 430 clinicians in this Medicare group
Fort Myers, FL 33908
- Reassigned Medicare billing, Florida enrollment
- 1,899 clinicians in this Medicare group
Jackson, MS 39202
- Reassigned Medicare billing, Mississippi enrollment
- 154 clinicians in this Medicare group
Beaver Dam, WI 53916
- Reassigned Medicare billing, Wisconsin enrollment
- 606 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Baptist Health Medical Center - Jacksonville
Acute Care Hospitals · Jacksonville, FLHca Florida Memorial Hospital
Acute Care Hospitals · Jacksonville, FLHca Florida Orange Park Hospital
Acute Care Hospitals · Orange Park, FLPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 29506 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Horsley's NPI number?
The NPI number for William Horsley is 1841341369. It was assigned to this individual provider in the NPPES registry on January 12, 2007.
Where is William Horsley located?
William Horsley practices at 101 S Ravenel St Ste 120, Florence, SC 29506. The listed phone number is (843) 777-7020.
What is William Horsley's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is William Horsley enrolled in Medicare?
Yes. William Horsley 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 Horsley's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Horsley reassigns Medicare benefits to 5 organizations: Cardiothoracic & Vascular Surgical Associates PA (Jacksonville, FL), Baptist Health Centers LLC (Munford, AL), Lee Health System Inc (Fort Myers, FL), Mississippi Baptist Medical Center, Inc. (Jackson, MS) and Agnesian Healthcare (Beaver Dam, WI). 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 Horsley's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Horsley accept?
Health plans from AvMed, Blue Cross and Blue Shield of Alabama, Dean Health Plan, Florida Blue (BlueCross BlueShield FL) and Florida Blue HMO (a BlueCross BlueShield FL company) and 5 other insurers list William Horsley 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 Horsley affiliated with any hospitals?
According to CMS data, William Horsley is affiliated with Baptist Health Medical Center - Jacksonville, Hca Florida Memorial Hospital and Hca Florida Orange Park Hospital.
When was this NPI record last updated?
The NPPES record for William Horsley was last updated on September 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 45 days 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.
# Dr. William Stewart Horsley, M.D. · NPI 1841341369
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Florence, South Carolina. Individual provider, active in the CMS NPPES registry since January 12, 2007.
## Identity
- **NPI:** 1841341369 (Entity type: Individual)
- **Enumerated:** January 12, 2007
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** 97964 (South Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 S RAVENEL ST STE 120, Florence, SC 29506-2619
- **Phone:** (843) 777-7020
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 5 organizations under Medicare reassignment (form CMS-855R): Cardiothoracic & Vascular Surgical Associates PA (NPI 1245111335, Jacksonville, FL); Baptist Health Centers LLC (NPI 1427012566, Munford, AL); Lee Health System Inc (NPI 1942058557, Fort Myers, FL); Mississippi Baptist Medical Center, Inc. (NPI 1467589556, Jackson, MS); Agnesian Healthcare (NPI 1700817657, Beaver Dam, WI) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Alabama School Of Medicine, class of 1989
## Record status
- **NPPES last updated:** September 10, 2026
- **Other identifiers:** Medicaid 124691000 (FL)
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Source: [NPI Profile](https://npiprofile.com/npi/1841341369) · Data from the CMS NPPES public registry.