DR. MARK D GWYNNE MD
NPI 1639275100
Family Medicine in Chapel Hill, NC
About Dr. Mark D Gwynne Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARK D GWYNNE MD (NPI 1639275100) is an individual family medicine provider in Chapel Hill, North Carolina, licensed in North Carolina (200400038) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Unc Hospitals, and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses
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. Mark D Gwynne 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 Reassignments
2Medicare enrollment records show Mark Gwynne reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chapel Hill, NC 27514
- Reassigned Medicare billing, North Carolina enrollment
- 2,797 clinicians in this Medicare group
Siler City, NC 27344
- Reassigned Medicare billing, North Carolina enrollment
- 234 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Unc Hospitals
Acute Care Hospitals · Chapel Hill, NCPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 27599 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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.
CHAPEL HILL, NC 27599
CHAPEL HILL, ND 27599
CHAPEL HILL, NC 27599
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 Mark Gwynne's NPI number?
The NPI number for Mark Gwynne is 1639275100. It was assigned to this individual provider in the NPPES registry on September 15, 2006.
Where is Mark Gwynne located?
Mark Gwynne practices at 101 Manning Dr, Chapel Hill, NC 27599. The listed phone number is (919) 966-4996.
What is Mark Gwynne's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mark Gwynne enrolled in Medicare?
Yes. Mark Gwynne 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 Mark Gwynne's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Gwynne reassigns Medicare benefits to 2 organizations: University Of North Carolina At Chapel Hill (Chapel Hill, NC) and Chatham Hospital, Inc. (Siler City, 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 Mark Gwynne's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Gwynne accept?
Health plans from UnitedHealthcare list Mark Gwynne 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 Mark Gwynne affiliated with any hospitals?
According to CMS data, Mark Gwynne is affiliated with Unc Hospitals.
When was this NPI record last updated?
The NPPES record for Mark Gwynne was last updated on March 31, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Dr. Mark D Gwynne, MD · NPI 1639275100
Family Medicine physician in Chapel Hill, North Carolina. Individual provider, active in the CMS NPPES registry since September 15, 2006.
## Identity
- **NPI:** 1639275100 (Entity type: Individual)
- **Enumerated:** September 15, 2006
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 200400038 (North Carolina)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 MANNING DR, Chapel Hill, NC 27599-0001
- **Phone:** (919) 966-4996 · **Fax:** (919) 843-5515
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): University Of North Carolina At Chapel Hill (NPI 1780669200, Chapel Hill, NC); Chatham Hospital, Inc. (NPI 1689967457, Siler City, NC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** March 31, 2021
- **Other identifiers:** Medicaid 89137AA (NC)
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Source: [NPI Profile](https://npiprofile.com/npi/1639275100) · Data from the CMS NPPES public registry.