MARY CATHERINE ERNSTER MD
NPI 1407434517
Pediatrics in Madison, WI
About Mary Catherine Ernster Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARY CATHERINE ERNSTER MD (NPI 1407434517) is an individual pediatrics provider in Madison, Wisconsin, licensed in Wisconsin (85282-20) and active in the NPI registry since March 2021. She is enrolled in Medicare PECOS and maintains a secondary practice location in Madison.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Location 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)
Mary Catherine Ernster Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Mary Ernster reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Madison, WI 53715
- Reassigned Medicare billing, Wisconsin enrollment
- 1,377 clinicians in this Medicare group
Park Ridge, IL 60068
- Reassigned Medicare billing, Illinois enrollment
- Medicare enrollment name: Advocate Health And Hospitals Corporation
- 4,870 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 53715 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.
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 Ernster's NPI number?
The NPI number for Mary Ernster is 1407434517. It was assigned to this individual provider in the NPPES registry on March 30, 2021. The provider is also known as Mary C Moore.
Where is Mary Ernster located?
Mary Ernster practices at 1211 Fish Hatchery Rd, Madison, WI 53715. The listed phone number is (608) 252-8000.
What is Mary Ernster's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Mary Ernster enrolled in Medicare?
Yes. Mary Ernster is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Mary Ernster's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mary Ernster reassigns Medicare benefits to 2 organizations: Dean Health Systems, Inc (Madison, WI) and Lutheran General Hospital (Park Ridge, 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 Mary Ernster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mary Ernster accept?
Health plans from Anthem Blue Cross and Blue Shield and Dean Health Plan list Mary Ernster 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 Mary Ernster was last updated on October 27, 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.
# Mary Catherine Ernster, MD · NPI 1407434517
Pediatrics physician in Madison, Wisconsin. Individual provider, active in the CMS NPPES registry since March 30, 2021.
## Identity
- **NPI:** 1407434517 (Entity type: Individual)
- **Enumerated:** March 30, 2021
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** 85282-20 (Wisconsin)
- **Sole proprietor:** No
## Practice location
- **Address:** 1211 FISH HATCHERY RD, Madison, WI 53715-1909
- **Phone:** (608) 252-8000 · **Fax:** (608) 258-6933
## 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): Dean Health Systems, Inc (NPI 1053358846, Madison, WI); Lutheran General Hospital (NPI 1801809306, Park Ridge, IL) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** October 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1407434517) · Data from the CMS NPPES public registry.