ELLEN WALKER SEYLLER MD
NPI 1558940445
Family Medicine in Cromwell, CT
About Ellen Walker Seyller Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN WALKER SEYLLER MD (NPI 1558940445) is an individual family medicine provider in Cromwell, Connecticut, licensed in Connecticut (082545) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS and is a graduate of University Of Vermont College Of Medicine (2021).
NPPES Registry Identity
Specialties & Licenses
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
Ellen Walker Seyller Md 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 Ellen Seyller reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Middletown, CT 06457
- Reassigned Medicare billing, Connecticut enrollment
- 147 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 06416 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 11
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 Ellen Seyller's NPI number?
The NPI number for Ellen Seyller is 1558940445. It was assigned to this individual provider in the NPPES registry on April 7, 2021.
Where is Ellen Seyller located?
Ellen Seyller practices at 70 Shunpike Rd, Cromwell, CT 06416. The listed phone number is (860) 358-5280.
What is Ellen Seyller's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Ellen Seyller enrolled in Medicare?
Yes. Ellen Seyller 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 Ellen Seyller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Seyller reassigns Medicare benefits to Mhs Primary Care Inc. (Middletown, CT). 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 Ellen Seyller's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Ellen Seyller was last updated on November 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Ellen Walker Seyller, MD · NPI 1558940445
Family Medicine physician in Cromwell, Connecticut. Individual provider, active in the CMS NPPES registry since April 7, 2021.
## Identity
- **NPI:** 1558940445 (Entity type: Individual)
- **Enumerated:** April 7, 2021
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** 082545 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 70 SHUNPIKE RD, Cromwell, CT 06416
- **Phone:** (860) 358-5280 · **Fax:** (860) 358-8650
## 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:** Mhs Primary Care Inc. (NPI 1740666312, Middletown, CT), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Vermont College Of Medicine, class of 2021
## Record status
- **NPPES last updated:** November 5, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1558940445) · Data from the CMS NPPES public registry.