MICHAEL P SIEGENTHALER MD
NPI 1093863532
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Farmington, CT
About Michael P Siegenthaler Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL P SIEGENTHALER MD (NPI 1093863532) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Farmington, Connecticut, licensed in Connecticut (036842) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS, is affiliated with Springfield Regional Medical Center, and maintains 5 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 5
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 and accepts Medicare assignment
Michael P Siegenthaler 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 Reassignments
12Medicare enrollment records show Michael Siegenthaler reassigns Medicare billing to 12 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Farmington, CT 06030
- Reassigned Medicare billing, Connecticut enrollment
- 788 clinicians in this Medicare group
Columbus, OH 43213
- Reassigned Medicare billing, Ohio enrollment
- 241 clinicians in this Medicare group
Springfield, OH 45504
- Reassigned Medicare billing, Ohio enrollment
- 215 clinicians in this Medicare group
Lima, OH 45801
- Reassigned Medicare billing, Ohio enrollment
- 439 clinicians in this Medicare group
Juneau, WI 53039
- Reassigned Medicare billing, Wisconsin enrollment
- 1,447 clinicians in this Medicare group
Plover, WI 54467
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1952890873 (Wisconsin)
- 2,476 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,283 clinicians in this Medicare group
Park Falls, WI 54552
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1700963048 (Wisconsin)
- 1,351 clinicians in this Medicare group
Chetek, WI 54728
- Reassigned Medicare billing, Wisconsin enrollment
- 1,616 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 7
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Springfield Regional Medical Center
Acute Care Hospitals · Springfield, OHMonument Health Rapid City Hospital
Acute Care Hospitals · Rapid City, SDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 06030 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.
FARMINGTON, CT 06030
FARMINGTON, CT 06030
FARMINGTON, CT 06030
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 Michael Siegenthaler's NPI number?
The NPI number for Michael Siegenthaler is 1093863532. It was assigned to this individual provider in the NPPES registry on January 8, 2007.
Where is Michael Siegenthaler located?
Michael Siegenthaler practices at 263 Farmington Ave, Farmington, CT 06030. The listed phone number is (860) 679-3343.
What is Michael Siegenthaler's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is Michael Siegenthaler enrolled in Medicare?
Yes. Michael Siegenthaler 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 organizations bill Medicare for Michael Siegenthaler's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Siegenthaler reassigns Medicare benefits to 12 organizations: University Of Connecticut Health Center (Farmington, CT), Mount Carmel Healthproviders Two LLC (Columbus, OH), Mercy Health Physicians Springfield Specialty Care LLC (Springfield, OH), Mercy Health Physicians Lima Specialty Care LLC (Lima, OH), Beaver Dam Community Hospitals Inc (Juneau, WI) and 7 more organizations, listed in the Medicare section above. 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 Michael Siegenthaler's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Siegenthaler accept?
Health plans from Anthem Blue Cross and Blue Shield, Antidote Health Plan of Ohio, Inc., Avera Health Plans, Blue Cross and Blue Shield of Texas and CHRISTUS Health Plan and 4 other insurers list Michael Siegenthaler 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.
Is Michael Siegenthaler affiliated with any hospitals?
According to CMS data, Michael Siegenthaler is affiliated with Springfield Regional Medical Center and Monument Health Rapid City Hospital.
When was this NPI record last updated?
The NPPES record for Michael Siegenthaler was last updated on September 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 48 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.
# Michael P Siegenthaler, MD · NPI 1093863532
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Farmington, Connecticut. Individual provider, active in the CMS NPPES registry since January 8, 2007.
## Identity
- **NPI:** 1093863532 (Entity type: Individual)
- **Enumerated:** January 8, 2007
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** 036842 (Connecticut)
- **Sole proprietor:** No
## Practice location
- **Address:** 263 FARMINGTON AVE, Farmington, CT 06030-8063
- **Phone:** (860) 679-3343 · **Fax:** (860) 679-4256
## 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:** 12 organizations under Medicare reassignment (form CMS-855R): University Of Connecticut Health Center (NPI 1720083769, Farmington, CT); Mount Carmel Healthproviders Two LLC (NPI 1134154750, Columbus, OH); Mercy Health Physicians Springfield Specialty Care LLC (NPI 1790308104, Springfield, OH); Mercy Health Physicians Lima Specialty Care LLC (NPI 1518589803, Lima, OH); Beaver Dam Community Hospitals Inc (NPI 1831410521, Juneau, WI); and 7 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1991
## Record status
- **NPPES last updated:** September 16, 2026
- **Other identifiers:** Medicaid 415096100 (MD)
---
Source: [NPI Profile](https://npiprofile.com/npi/1093863532) · Data from the CMS NPPES public registry.