MRS. LAUREN ELIZABETH MOUNTJOY NP
NPI 1477339711
Nurse Practitioner - Pediatrics in Saint Louis, MO
About Mrs. Lauren Elizabeth Mountjoy Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MRS. LAUREN ELIZABETH MOUNTJOY NP (NPI 1477339711) is an individual pediatrics provider in Saint Louis, Missouri, licensed in Missouri (2023035002) and active in the NPI registry since September 2023. She is enrolled in Medicare PECOS and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Secondary Practice Locations 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mrs. Lauren Elizabeth Mountjoy Np is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Lauren Mountjoy reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 435 clinicians in this Medicare group
Saint Louis, MO 63128
- Reassigned Medicare billing, Missouri enrollment
- Medicare enrollment name: St Anthonys Physician Organization Hospitalist Services Lc
- 340 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 63110 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 63110
SAINT LOUIS, MO 63110
SAINT LOUIS, MO 63110
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 Lauren Mountjoy's NPI number?
The NPI number for Lauren Mountjoy is 1477339711. It was assigned to this individual provider in the NPPES registry on September 4, 2023. The provider is also known as Lauren Elizabeth Nejelski.
Where is Lauren Mountjoy located?
Lauren Mountjoy practices at 1 Childrens Pl, Saint Louis, MO 63110. The listed phone number is (636) 875-4834.
What is Lauren Mountjoy's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Pediatrics, with taxonomy code 363LP0200X.
Is Lauren Mountjoy enrolled in Medicare?
Yes. Lauren Mountjoy is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Lauren Mountjoy's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Lauren Mountjoy reassigns Medicare benefits to 2 organizations: Mercy Hospitals East Communities (Saint Louis, MO) and St Anthonys Physician Organization Hospitalist Services, L.C. (Saint Louis, MO). 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 Lauren Mountjoy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Lauren Mountjoy was last updated on December 31, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Mrs. Lauren Elizabeth Mountjoy, NP · NPI 1477339711
Pediatrics physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since September 4, 2023.
## Identity
- **NPI:** 1477339711 (Entity type: Individual)
- **Enumerated:** September 4, 2023
- **Primary specialty:** Nurse Practitioner - Pediatrics · taxonomy 363LP0200X
- **State license:** 2023035002 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 CHILDRENS PL, Saint Louis, MO 63110-1002
- **Phone:** (636) 875-4834
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Mercy Hospitals East Communities (NPI 1851431738, Saint Louis, MO); St Anthonys Physician Organization Hospitalist Services, L.C. (NPI 1407216336, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 31, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1477339711) · Data from the CMS NPPES public registry.