Quick answers
- Does Sean C. Halligan accept Medicare assignment?
- Yes. Medicare's clinician data says Sean C. Halligan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Sean C. Halligan see?
- In 2024, CMS data shows 1,008 Original Medicare patients and 1,824 services for Sean C. Halligan. This counts Original Medicare only and measures volume, not quality.
- What is Sean C. Halligan's NPI number?
- 1174504658. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Sean C. Halligan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,008 |
|---|---|
| Services billed to Medicare | 1,824 |
| Different services or procedures | 60 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Ultrasound of heart with color-depicted blood flow, rate, direction and valve function (93306)585 services
- Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)252 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)159 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)85 services
- Ultrasound of heart, follow-up (93308)83 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease51%
- Arthritis43%
- Diabetes38%
- Chronic kidney disease35%
Hospitals where Sean C. Halligan works
Medicare's Facility Affiliation Data lists Sean C. Halligan at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Avera Heart Hospital of South DakotaSioux Falls, SD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 430095
- Avera McKennan Hospital & University Health CenterSioux Falls, SD · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 430016
- Lakes Regional HealthcareSpirit Lake, IA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 160124
- Sioux Center HealthSioux Center, IA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 161346
- Spencer Municipal HospitalSpencer, IA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 160112
Practice locations
Addresses where Sean C. Halligan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1325 S Cliff AveSioux Falls, SD 57105
- 300 S Bruce StMarshall, MN 56258 (507) 537‑9007
- 4500 W 69th StSioux Falls, SD 57108 (605) 977‑7000
- 4520 W 69th StSioux Falls, SD 57108
Group practices
Medicare enrollment lists Sean C. Halligan as a member of this group (CMS data updated October 2, 2026).
- Heart Hospital of South Dakota LLC67 clinicians in the group
Specialties
- Interventional Cardiologyprimary
Find other Interventional Cardiology doctors in South Dakota →
Other interventional cardiologists in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Other clinicians in Heart Hospital of South Dakota LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Nebraska College Of Medicine |
| Graduation year | 1997 (29 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1174504658 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians