WILLIAM S MARSH III, DO, PA
NPI 1063440014
Physical Medicine & Rehabilitation in Killeen, TX
About William S Marsh Iii, Do, Pa NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM S MARSH III, DO, PA (NPI 1063440014) is a healthcare organization registered as a physical medicine & rehabilitation in Killeen, Texas and active in the NPI registry since June 2006. The organization holds a CLIA Waiver certificate valid through March 9, 2028 and lists William S Marsh, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
William S Marsh Iii, Do, Pa is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
7Medicare enrollment records show 7 clinicians reassign Medicare billing to William S Marsh III, Do, PA, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 3 within 10 miles. They are listed nearest first.
Clinicians, nearest first (7)
Killeen, TX 76543
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 45D2004656
William S Marsh III Do PA · Killeen, TXFrequently 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 S Marsh III, Do, PA's NPI number?
The NPI number for William S Marsh III, Do, PA is 1063440014. It was assigned to this organization in the NPPES registry on June 29, 2006.
Where is William S Marsh III, Do, PA located?
William S Marsh III, Do, PA is located at 5320 E Central Texas Expy Ste 105, Killeen, TX 76543. The listed phone number is (254) 519-1900.
What is William S Marsh III, Do, PA's specialty?
The primary specialty registered for this NPI is Physical Medicine & Rehabilitation with taxonomy code 208100000X.
Is William S Marsh III, Do, PA enrolled in Medicare?
Yes. William S Marsh III, Do, PA is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through William S Marsh III, Do, PA?
According to the CMS Revalidation Reassignment List (October 2026 release), 7 clinicians in 4 Medicare specialties reassign their Medicare billing to William S Marsh III, Do, PA. A 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 the clinician's services. The largest specialties are Nurse Practitioner (4), General Practice (1) and Orthopedic Surgery (1). Of these, 1 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does William S Marsh III, Do, PA hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 45D2004656) is associated with this NPI, valid through March 9, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does William S Marsh III, Do, PA accept?
Health plans from Blue Cross and Blue Shield of Texas list William S Marsh III, Do, PA 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.
When was this NPI record last updated?
The NPPES record for William S Marsh III, Do, PA was last updated on August 8, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.