DR. WILLIAM GUNNAR O'NEAL MD
NPI 1063156768
Family Medicine - Sports Medicine in Chillicothe, OH
About Dr. William Gunnar O'neal Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM GUNNAR O'NEAL MD (NPI 1063156768) is an individual sports medicine provider in Chillicothe, Ohio, licensed in Ohio (35.156549) and active in the NPI registry since April 2022. He is enrolled in Medicare PECOS, is affiliated with Adena Regional Medical Center, and is a graduate of Indiana University School Of Medicine (2022).
NPPES Registry Identity
Specialties & Licenses
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 Gunnar O'neal Md 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 Reassignment
Medicare enrollment records show William O'neal reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chillicothe, OH 45601
- Reassigned Medicare billing, Ohio enrollment
- 763 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Adena Regional Medical Center
Acute Care Hospitals · Chillicothe, OHAdena Pike Medical Center
Critical Access Hospitals · Waverly, OHPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 45601 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CHILLICOTHE, OH 45601
CHILLICOTHE, OH 45601
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 O'neal's NPI number?
The NPI number for William O'neal is 1063156768. It was assigned to this individual provider in the NPPES registry on April 27, 2022.
Where is William O'neal located?
William O'neal practices at 272 Hospital Rd, Chillicothe, OH 45601. The listed phone number is (740) 779-4598.
What is William O'neal's specialty?
The primary specialty registered for this NPI is Family Medicine, specializing in Sports Medicine, with taxonomy code 207QS0010X.
Is William O'neal enrolled in Medicare?
Yes. William O'neal 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 organization bills Medicare for William O'neal's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William O'neal reassigns Medicare benefits to Adena Medical Group LLC (Chillicothe, OH). The 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 O'neal's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William O'neal accept?
Health plans from Anthem Blue Cross and Blue Shield, CareSource, MedMutual, Molina Healthcare and Oscar Health Insurance list William O'neal 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 O'neal affiliated with any hospitals?
According to CMS data, William O'neal is affiliated with Adena Regional Medical Center and Adena Pike Medical Center.
When was this NPI record last updated?
The NPPES record for William O'neal was last updated on August 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 months 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 Gunnar O'neal, MD · NPI 1063156768
Sports Medicine physician in Chillicothe, Ohio. Individual provider, active in the CMS NPPES registry since April 27, 2022.
## Identity
- **NPI:** 1063156768 (Entity type: Individual)
- **Enumerated:** April 27, 2022
- **Primary specialty:** Family Medicine - Sports Medicine · taxonomy 207QS0010X
- **State license:** 35.156549 (Ohio)
- **Sole proprietor:** No
## Practice location
- **Address:** 272 HOSPITAL RD, Chillicothe, OH 45601-9031
- **Phone:** (740) 779-4598
## 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:** Adena Medical Group LLC (NPI 1235468083, Chillicothe, OH), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Indiana University School Of Medicine, class of 2022
## Record status
- **NPPES last updated:** August 5, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1063156768) · Data from the CMS NPPES public registry.