GREYSTONE OBGYN PC
NPI 1790839157
Specialist in Conyers, GA
About Greystone Obgyn Pc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GREYSTONE OBGYN PC (NPI 1790839157), doing business as Greystone Ob Gyn, is a healthcare organization registered as a specialist in Conyers, Georgia and active in the NPI registry since January 2007. The organization holds a CLIA Waiver certificate valid through December 17, 2026 and lists Timothy N. Cowthorn, Physician/managing Partner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 1
Group Practice 1
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)
Greystone Obgyn Pc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
18Medicare enrollment records show 18 clinicians reassign Medicare billing to Greystone Obgyn PC, which bills Medicare for the services they deliver. Of these, 14 practice at this address. They are listed nearest first.
Clinicians by Medicare Specialty 3
Clinicians, nearest first (18)
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 11D0923203
Greystone Ob/Gyn PC · Conyers, GAFrequently 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 Greystone Obgyn PC's NPI number?
The NPI number for Greystone Obgyn PC is 1790839157. It was assigned to this organization in the NPPES registry on January 23, 2007. The provider is doing business as Greystone OB GYN.
Where is Greystone Obgyn PC located?
Greystone Obgyn PC is located at 3240 Avalon Boulevard, Conyers, GA 30013. The listed phone number is (770) 860-1133.
What is Greystone Obgyn PC's specialty?
The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.
Is Greystone Obgyn PC enrolled in Medicare?
Yes. Greystone Obgyn PC is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Greystone Obgyn PC?
According to the CMS Revalidation Reassignment List (October 2026 release), 18 clinicians in 3 Medicare specialties reassign their Medicare billing to Greystone Obgyn PC. 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 Certified Nurse Midwife (CNM) (8), Obstetrics/Gynecology (7) and Nurse Practitioner (3). Of these, 14 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Greystone Obgyn PC hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 11D0923203) is associated with this NPI, valid through December 17, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
What insurance does Greystone Obgyn PC accept?
Health plans from Ambetter Health, Ambetter from Absolute Total Care, Ambetter of Alabama, Ambetter of North Carolina and Ambetter of Tennessee list Greystone Obgyn PC 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 Greystone Obgyn PC was last updated on July 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Greystone Obgyn Pc · NPI 1790839157
Specialist organization in Conyers, Georgia. Organization record, active in the CMS NPPES registry since January 23, 2007.
## Identity
- **NPI:** 1790839157 (Entity type: Organization)
- **Enumerated:** January 23, 2007
- **Primary specialty:** Specialist · taxonomy 174400000X
- **Also known as:** Greystone OB GYN (Doing Business As)
- **Organization subpart:** No
- **Authorized official:** Timothy Cowthorn, PHYSICIAN/MANAGING PARTNER
## Practice location
- **Address:** 3240 AVALON BOULEVARD, Conyers, GA 30013-6320
- **Phone:** (770) 860-1133 · **Fax:** (770) 860-1599
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 18 clinicians in 3 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Certified Nurse Midwife (CNM) (8), Obstetrics/Gynecology (7), Nurse Practitioner (3); 14 practice at this address · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 28, 2025
- **Other identifiers:** Medicaid 00615469E (GA)
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1790839157) · Data from the CMS NPPES public registry.