MCKENZIE DEE MACMILLAN
NPI 1952245037
Nurse Practitioner - Family in Saint Louis, MO
About Mckenzie Dee Macmillan NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MCKENZIE DEE MACMILLAN (NPI 1952245037) is an individual family provider in Saint Louis, Missouri, licensed in Missouri (F06261703) and active in the NPI registry since April 2026. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Other (2026).
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 and accepts Medicare assignment
Mckenzie Dee Macmillan 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 Reassignment
Medicare enrollment records show Mckenzie Macmillan 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
- 228 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.
Mercy Hospital St Louis
Acute Care Hospitals · Saint Louis, MOPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63141 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
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 Mckenzie Macmillan's NPI number?
The NPI number for Mckenzie Macmillan is 1952245037. It was assigned to this individual provider in the NPPES registry on April 17, 2026.
Where is Mckenzie Macmillan located?
Mckenzie Macmillan practices at 621 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (314) 251-6800.
What is Mckenzie Macmillan's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Mckenzie Macmillan enrolled in Medicare?
Yes. Mckenzie Macmillan 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 organization bills Medicare for Mckenzie Macmillan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mckenzie Macmillan reassigns Medicare benefits to Mercy Clinic 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 Mckenzie Macmillan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mckenzie Macmillan 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 2 other insurers list Mckenzie Macmillan 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 Mckenzie Macmillan affiliated with any hospitals?
According to CMS data, Mckenzie Macmillan is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Mckenzie Macmillan was last updated on June 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Mckenzie Dee Macmillan · NPI 1952245037
Family physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since April 17, 2026.
## Identity
- **NPI:** 1952245037 (Entity type: Individual)
- **Enumerated:** April 17, 2026
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** F06261703 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 621 S NEW BALLAS RD, Saint Louis, MO 63141-8232
- **Phone:** (314) 251-6800
## 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:** Mercy Clinic East Communities (NPI 1851335228, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2026
## Record status
- **NPPES last updated:** June 24, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1952245037) · Data from the CMS NPPES public registry.