MARGARET M. MUELLER M.D.
NPI 1295889244
Pediatrics in Cottleville, MO
About Margaret M. Mueller M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARGARET M. MUELLER M.D. (NPI 1295889244) is an individual pediatrics provider in Cottleville, Missouri, licensed in Missouri (2006031055) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS.
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 (PECOS)
Margaret M. Mueller M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Margaret Mueller reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 435 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63376 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 7
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 Margaret Mueller's NPI number?
The NPI number for Margaret Mueller is 1295889244. It was assigned to this individual provider in the NPPES registry on January 23, 2007.
Where is Margaret Mueller located?
Margaret Mueller practices at 4525 Mid Rivers Mall Dr Suite 20, Cottleville, MO 63376. The listed phone number is (636) 229-3393.
What is Margaret Mueller's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Margaret Mueller enrolled in Medicare?
Yes. Margaret Mueller is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Margaret Mueller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Margaret Mueller reassigns Medicare benefits to Mercy Hospitals East Communities (Saint Louis, MO). 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 Margaret Mueller's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Margaret Mueller accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 3 other insurers list Margaret Mueller 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 Margaret Mueller was last updated on December 14, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Margaret M. Mueller, M.D. · NPI 1295889244
Pediatrics physician in Cottleville, Missouri. Individual provider, active in the CMS NPPES registry since January 23, 2007.
## Identity
- **NPI:** 1295889244 (Entity type: Individual)
- **Enumerated:** January 23, 2007
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 2006031055 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 4525 MID RIVERS MALL DR, SUITE 20, Cottleville, MO 63376-2820
- **Phone:** (636) 229-3393 · **Fax:** (636) 441-4398
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Mercy Hospitals East Communities (NPI 1851431738, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 14, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1295889244) · Data from the CMS NPPES public registry.