ANNE T CAHILL M.D.
NPI 1326066036
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Billings, MT
About Anne T Cahill M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ANNE T CAHILL M.D. (NPI 1326066036) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Billings, Montana, licensed in Montana (MED-PHYS-LIC-142972) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS, is affiliated with St Vincent Healthcare, and maintains a secondary practice location in Saint Joseph.
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Location 1
Other Identifiers 3
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
Anne T Cahill M.d. 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
15Medicare enrollment records show Anne Cahill reassigns Medicare billing to 15 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Billings, MT 59101
- Reassigned Medicare billing, Montana enrollment
- 438 clinicians in this Medicare group
Rice Lake, WI 54868
- Reassigned Medicare billing, Wisconsin enrollment
- 1,616 clinicians in this Medicare group
Eau Claire, WI 54701
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1952890873 (Wisconsin)
- 2,476 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
Neillsville, WI 54456
- Reassigned Medicare billing, Wisconsin enrollment
- Also billed through NPI 1346239373 (Wisconsin)
- 1,440 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, Wisconsin enrollment
- 2,540 clinicians in this Medicare group
New London, WI 54961
- Reassigned Medicare billing, Wisconsin enrollment
- 988 clinicians in this Medicare group
Columbus, WI 53925
- Reassigned Medicare billing, Wisconsin enrollment
- Medicare enrollment name: Beaver Dam Community Hospitals Inc.
- 1,447 clinicians in this Medicare group
O Fallon, MO 63366
- Reassigned Medicare billing, Missouri enrollment
- 697 clinicians in this Medicare group
Utica, NY 13502
- Reassigned Medicare billing, New York enrollment
- 657 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
St Vincent Healthcare
Acute Care Hospitals · Billings, MTPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 59101 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Anne Cahill's NPI number?
The NPI number for Anne Cahill is 1326066036. It was assigned to this individual provider in the NPPES registry on July 18, 2006. The provider is also known as Anne T Sykes M.D..
Where is Anne Cahill located?
Anne Cahill practices at 2900 12th Ave N Ste 400E, Billings, MT 59101. The listed phone number is (406) 238-6820.
What is Anne Cahill's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is Anne Cahill enrolled in Medicare?
Yes. Anne Cahill 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 Anne Cahill's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Anne Cahill reassigns Medicare benefits to 15 organizations: Scl Health Medical Group - Billings LLC (Billings, MT), Lakeview Medical Center Inc Of Rice Lake (Rice Lake, WI), Mchs Hospitals Inc (Eau Claire, WI), Flambeau Hospital Inc (Park Falls, WI), Memorial Hospital Inc (Neillsville, WI) and 10 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 Anne Cahill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Anne Cahill accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Arkansas Health & Wellness, Ambetter from Sunflower Health Plan and Ambetter of Oklahoma and 6 other insurers list Anne Cahill 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 Anne Cahill affiliated with any hospitals?
According to CMS data, Anne Cahill is affiliated with St Vincent Healthcare.
When was this NPI record last updated?
The NPPES record for Anne Cahill was last updated on August 31, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 57 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.
# Anne T Cahill, M.D. · NPI 1326066036
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Billings, Montana. Individual provider, active in the CMS NPPES registry since July 18, 2006.
## Identity
- **NPI:** 1326066036 (Entity type: Individual)
- **Enumerated:** July 18, 2006
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** MED-PHYS-LIC-142972 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 2900 12TH AVE N STE 400E, Billings, MT 59101-7514
- **Phone:** (406) 238-6820 · **Fax:** (406) 238-6838
## 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:** 15 organizations under Medicare reassignment (form CMS-855R): Scl Health Medical Group - Billings LLC (NPI 1508289703, Billings, MT); Lakeview Medical Center Inc Of Rice Lake (NPI 1093201832, Rice Lake, WI); Mchs Hospitals Inc (NPI 1316416035, Eau Claire, WI); Flambeau Hospital Inc (NPI 1194317966, Park Falls, WI); Memorial Hospital Inc (NPI 1033701800, Neillsville, WI); and 10 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Medical College Of Wisconsin, class of 1994
## Record status
- **NPPES last updated:** August 31, 2026
- **Other identifiers:** Medicaid 200899260A (OK); Medicaid 200020603 (MO); Medicaid 02205434 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1326066036) · Data from the CMS NPPES public registry.