DR. GREGORY W RENNIRT M.D.
NPI 1871517664
Orthopaedic Surgery in Louisville, KY
About Dr. Gregory W Rennirt M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GREGORY W RENNIRT M.D. (NPI 1871517664) is an individual orthopaedic surgery provider in Louisville, Kentucky, licensed in Kentucky (29728) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Chi St Alexius Health Williston, and is a graduate of University Of Louisville School Of Medicine (1992).
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. Gregory W Rennirt 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
2Medicare enrollment records show Gregory Rennirt reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Louisville, KY 40202
- Reassigned Medicare billing, Kentucky enrollment
- 2,337 clinicians in this Medicare group
Williston, ND 58801
- Reassigned Medicare billing, North Dakota enrollment
- Also billed through NPI 1902824576 (North Dakota)
- 268 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Chi St Alexius Health Williston
Critical Access Hospitals · Williston, NDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 40202 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 2
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 Gregory Rennirt's NPI number?
The NPI number for Gregory Rennirt is 1871517664. It was assigned to this individual provider in the NPPES registry on July 26, 2006.
Where is Gregory Rennirt located?
Gregory Rennirt practices at 234 E Gray St Ste 564, Louisville, KY 40202. The listed phone number is (502) 629-5460.
What is Gregory Rennirt's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Gregory Rennirt enrolled in Medicare?
Yes. Gregory Rennirt 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 Gregory Rennirt's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gregory Rennirt reassigns Medicare benefits to 2 organizations: University Of Louisville Physicians, Inc. (Louisville, KY) and Mercy Medical Center (Williston, ND). 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 Gregory Rennirt's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gregory Rennirt accept?
Health plans from Blue Cross Blue Shield of North Dakota and Sanford Health Plan list Gregory Rennirt 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 Gregory Rennirt affiliated with any hospitals?
According to CMS data, Gregory Rennirt is affiliated with Chi St Alexius Health Williston.
When was this NPI record last updated?
The NPPES record for Gregory Rennirt was last updated on August 29, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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. Gregory W Rennirt, M.D. · NPI 1871517664
Orthopaedic Surgery physician in Louisville, Kentucky. Individual provider, active in the CMS NPPES registry since July 26, 2006.
## Identity
- **NPI:** 1871517664 (Entity type: Individual)
- **Enumerated:** July 26, 2006
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **State license:** 29728 (Kentucky)
- **Sole proprietor:** No
## Practice location
- **Address:** 234 E GRAY ST STE 564, Louisville, KY 40202-1914
- **Phone:** (502) 629-5460 · **Fax:** (502) 629-5461
## 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 Louisville Physicians, Inc. (NPI 1184980963, Louisville, KY); Mercy Medical Center (NPI 1700990041, Williston, ND) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Louisville School Of Medicine, class of 1992
## Record status
- **NPPES last updated:** August 29, 2019
- **Other identifiers:** Medicaid 64297286 (KY)
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Source: [NPI Profile](https://npiprofile.com/npi/1871517664) · Data from the CMS NPPES public registry.