MARY BETH WALKER FNP
NPI 1003309147
Nurse Practitioner - Family in Saint Louis, MO
About Mary Beth Walker Fnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY BETH WALKER FNP (NPI 1003309147) is an individual family provider in Saint Louis, Missouri, licensed in Missouri (2018013788) and active in the NPI registry since June 2018. She is enrolled in Medicare PECOS, is affiliated with Mercy Hospital St Louis, and is a graduate of Other (2017).
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
Mary Beth Walker Fnp 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 Reassignments
2Medicare enrollment records show Mary Beth Walker 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
- 241 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 326 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
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
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 Mary Beth Walker's NPI number?
The NPI number for Mary Beth Walker is 1003309147. It was assigned to this individual provider in the NPPES registry on June 13, 2018.
Where is Mary Beth Walker located?
Mary Beth Walker practices at 615 S New Ballas Rd, Saint Louis, MO 63141. The listed phone number is (314) 251-6000.
What is Mary Beth Walker's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.
Is Mary Beth Walker enrolled in Medicare?
Yes. Mary Beth Walker 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 organizations bill Medicare for Mary Beth Walker's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Beth Walker reassigns Medicare benefits to 2 organizations: Mercy Hospitals East Communities (Saint Louis, MO) and Mercy Clinic Adult Hospitalists - St. Louis, LLC (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 Mary Beth Walker's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Beth Walker accept?
Health plans from Anthem Blue Cross and Blue Shield list Mary Beth Walker 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 Mary Beth Walker affiliated with any hospitals?
According to CMS data, Mary Beth Walker is affiliated with Mercy Hospital St Louis.
When was this NPI record last updated?
The NPPES record for Mary Beth Walker was last updated on June 13, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Mary Beth Walker, FNP · NPI 1003309147
Family physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since June 13, 2018.
## Identity
- **NPI:** 1003309147 (Entity type: Individual)
- **Enumerated:** June 13, 2018
- **Primary specialty:** Nurse Practitioner - Family · taxonomy 363LF0000X
- **State license:** 2018013788 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 615 S NEW BALLAS RD, Saint Louis, MO 63141-8221
- **Phone:** (314) 251-6000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Mercy Hospitals East Communities (NPI 1427098169, Saint Louis, MO); Mercy Clinic Adult Hospitalists - St. Louis, LLC (NPI 1841235108, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2017
## Record status
- **NPPES last updated:** June 13, 2018
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Source: [NPI Profile](https://npiprofile.com/npi/1003309147) · Data from the CMS NPPES public registry.