CLAYTON MEDICAL ASSOCIATES, P.C.
NPI 1891774329
Internal Medicine - Rheumatology in Saint Louis, MO
About Clayton Medical Associates, P.c. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CLAYTON MEDICAL ASSOCIATES, P.C. (NPI 1891774329), doing business as Saint Louis Rheumatology, is a healthcare organization registered as a rheumatology in Saint Louis, Missouri and active in the NPI registry since January 2006. The organization lists Laci Hueffmeier, Practice Administrator, as its authorized official.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 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)
Clayton Medical Associates, P.c. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
3Medicare enrollment records show 3 clinicians reassign Medicare billing to Clayton Medical Associates, P.C., which bills Medicare for the services they deliver. Of these, 2 practice within 10 miles. They are listed nearest first.
Clinicians, nearest first (3)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Clayton Medical Associates, P.C.'s NPI number?
The NPI number for Clayton Medical Associates, P.C. is 1891774329. It was assigned to this organization in the NPPES registry on January 12, 2006. The provider is doing business as Saint Louis Rheumatology.
Where is Clayton Medical Associates, P.C. located?
Clayton Medical Associates, P.C. is located at 520 S Elm Ave, Saint Louis, MO 63119. The listed phone number is (314) 645-4434.
What is Clayton Medical Associates, P.C.'s specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Clayton Medical Associates, P.C. enrolled in Medicare?
Yes. Clayton Medical Associates, P.C. is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Clayton Medical Associates, P.C.?
According to the CMS Revalidation Reassignment List (October 2026 release), 3 clinicians reassign their Medicare billing to Clayton Medical Associates, P.C., in Nurse Practitioner and Rheumatology. 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. Of these, 2 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does Clayton Medical Associates, P.C. accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Absolute Total Care, Ambetter from Arkansas Health & Wellness and Ambetter from Buckeye Health Plan and 13 other insurers list Clayton Medical Associates, P.C. 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 Clayton Medical Associates, P.C. was last updated on July 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Clayton Medical Associates, P.c. · NPI 1891774329
Rheumatology organization in Saint Louis, Missouri. Organization record, active in the CMS NPPES registry since January 12, 2006.
## Identity
- **NPI:** 1891774329 (Entity type: Organization)
- **Enumerated:** January 12, 2006
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **Also known as:** Saint Louis Rheumatology (Doing Business As)
- **Organization subpart:** No
- **Authorized official:** Laci Hueffmeier, PRACTICE ADMINISTRATOR
## Practice location
- **Address:** 520 S ELM AVE, Saint Louis, MO 63119-3845
- **Phone:** (314) 645-4434 · **Fax:** (314) 645-3801
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 3 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Rheumatology (2), Nurse Practitioner (1); 2 practice within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 16, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1891774329) · Data from the CMS NPPES public registry.