MS. ELLEN EDITH MOUSER PMHNP
NPI 1003238668
Nurse Practitioner - Psychiatric/Mental Health in Saint Louis, MO
About Ms. Ellen Edith Mouser Pmhnp NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. ELLEN EDITH MOUSER PMHNP (NPI 1003238668) is an individual psychiatric/mental health provider in Saint Louis, Missouri, licensed in Missouri (2013037707) and active in the NPI registry since January 2014. She is enrolled in Medicare PECOS and maintains a secondary practice location in O Fallon.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 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 (PECOS)
Ms. Ellen Edith Mouser Pmhnp is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Ellen Mouser reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Wood River, IL 62095
- Reassigned Medicare billing, Illinois enrollment
- 90 clinicians in this Medicare group
Jerseyville, IL 62052
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Jersey Community Hospital
- 61 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 63129 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 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT LOUIS, MO 63129
SAINT LOUIS, MO 63129
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 Ellen Mouser's NPI number?
The NPI number for Ellen Mouser is 1003238668. It was assigned to this individual provider in the NPPES registry on January 15, 2014.
Where is Ellen Mouser located?
Ellen Mouser practices at 4121 Union Rd Ste 201, Saint Louis, MO 63129. The listed phone number is (314) 930-3520.
What is Ellen Mouser's specialty?
The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.
Is Ellen Mouser enrolled in Medicare?
Yes. Ellen Mouser is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Ellen Mouser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Mouser reassigns Medicare benefits to 2 organizations: Chestnut Health Systems Inc. (Wood River, IL) and Jersey Community Hospital District (Jerseyville, IL). 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 Ellen Mouser's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ellen Mouser accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Moda Health Plan, Inc. list Ellen Mouser 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 Ellen Mouser was last updated on October 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Ms. Ellen Edith Mouser, PMHNP · NPI 1003238668
Psychiatric/Mental Health physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since January 15, 2014.
## Identity
- **NPI:** 1003238668 (Entity type: Individual)
- **Enumerated:** January 15, 2014
- **Primary specialty:** Nurse Practitioner - Psychiatric/Mental Health · taxonomy 363LP0808X
- **State license:** 2013037707 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 4121 UNION RD STE 201, Saint Louis, MO 63129-1070
- **Phone:** (314) 930-3520 · **Fax:** (314) 930-3675
## 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): Chestnut Health Systems Inc. (NPI 1235941311, Wood River, IL); Jersey Community Hospital District (NPI 1134163827, Jerseyville, IL) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 22, 2026
- **Other identifiers:** Other 201905482NP-PP (OR); Other 2018080836 (IL)
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Source: [NPI Profile](https://npiprofile.com/npi/1003238668) · Data from the CMS NPPES public registry.