DR. ELLEN MARGARET NICASTRO MD
NPI 1861604423
Pediatrics in Saint Louis, MO
About Dr. Ellen Margaret Nicastro Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ELLEN MARGARET NICASTRO MD (NPI 1861604423) is an individual pediatrics provider in Saint Louis, Missouri, licensed in Missouri (2007010301) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
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)
Dr. Ellen Margaret Nicastro Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Ellen Nicastro reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Creve Coeur, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 19 clinicians in this Medicare group
Saint Louis, MO 63141
- Reassigned Medicare billing, Missouri enrollment
- 744 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 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.
CREVE COEUR, MO 63141
SAINT LOUIS, MO 63141
SAINT LOUIS, MO 63141
CREVE COEUR, 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 Ellen Nicastro's NPI number?
The NPI number for Ellen Nicastro is 1861604423. It was assigned to this individual provider in the NPPES registry on May 4, 2007.
Where is Ellen Nicastro located?
Ellen Nicastro practices at 845 N New Ballas Ct Ste 205, Saint Louis, MO 63141. The listed phone number is (314) 859-4460.
What is Ellen Nicastro's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Ellen Nicastro enrolled in Medicare?
Yes. Ellen Nicastro is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Ellen Nicastro's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Nicastro reassigns Medicare benefits to 2 organizations: Washington University (Creve Coeur, MO) and Mercy Clinic East Communities (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 Ellen Nicastro's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ellen Nicastro accept?
Health plans from Cox HealthPlans and UnitedHealthcare list Ellen Nicastro 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 Nicastro was last updated on April 18, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.
# Dr. Ellen Margaret Nicastro, MD · NPI 1861604423
Pediatrics physician in Saint Louis, Missouri. Individual provider, active in the CMS NPPES registry since May 4, 2007.
## Identity
- **NPI:** 1861604423 (Entity type: Individual)
- **Enumerated:** May 4, 2007
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 2007010301 (Missouri)
- **Sole proprietor:** No
## Practice location
- **Address:** 845 N NEW BALLAS CT, STE 205, Saint Louis, MO 63141-7134
- **Phone:** (314) 859-4460 · **Fax:** (833) 740-4372
## 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): Washington University (NPI 1770356289, Creve Coeur, MO); Mercy Clinic East Communities (NPI 1043574940, Saint Louis, MO) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 18, 2025
- **Other identifiers:** Medicaid 207278508 (MO)
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Source: [NPI Profile](https://npiprofile.com/npi/1861604423) · Data from the CMS NPPES public registry.