MARIA LENA WALLS ANP
NPI 1740517515
Nurse Practitioner - Adult Health in O Fallon, MO
About Maria Lena Walls Anp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARIA LENA WALLS ANP (NPI 1740517515) is an individual adult health provider in O Fallon, Missouri, licensed in Missouri (2009034346) and active in the NPI registry since November 2009. She is enrolled in Medicare PECOS and is a graduate of Other (2004).
NPPES Registry Identity
Specialties & Licenses 2
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
Maria Lena Walls Anp 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 Maria Walls 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
- 611 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 8
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 63368 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 4
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 Maria Walls's NPI number?
The NPI number for Maria Walls is 1740517515. It was assigned to this individual provider in the NPPES registry on November 15, 2009.
Where is Maria Walls located?
Maria Walls practices at 2299 Technology Dr Ste 320, O Fallon, MO 63368. The listed phone number is (314) 996-4545.
What is Maria Walls's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Adult Health, with taxonomy code 363LA2200X.
Is Maria Walls enrolled in Medicare?
Yes. Maria Walls 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 Maria Walls's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maria Walls reassigns Medicare benefits to Physician Groups Lc (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 Maria Walls's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Maria Walls accept?
Health plans from UnitedHealthcare list Maria Walls 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 Maria Walls was last updated on October 23, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 days 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.
# Maria Lena Walls, ANP · NPI 1740517515
Adult Health physician in O Fallon, Missouri. Individual provider, active in the CMS NPPES registry since November 15, 2009.
## Identity
- **NPI:** 1740517515 (Entity type: Individual)
- **Enumerated:** November 15, 2009
- **Primary specialty:** Nurse Practitioner - Adult Health · taxonomy 363LA2200X
- **State license:** 2009034346 (Missouri)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2299 TECHNOLOGY DR STE 320, O Fallon, MO 63368-7341
- **Phone:** (314) 996-4545 · **Fax:** (314) 996-4546
## 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:** Physician Groups Lc (NPI 1285664268, Saint Louis, MO), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** October 23, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1740517515) · Data from the CMS NPPES public registry.