Quick answers
- Which hospitals does Guy M. Sullivan work at?
- Medicare's official clinician data lists Guy M. Sullivan at 5 hospitals: Avera de Smet Memorial Hospital - CAH, Avera McKennan Hospital & University Health Center, Brookings Health System, Sanford Usd Medical Center and Sioux Falls Specialty Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Guy M. Sullivan see patients?
- Medicare's clinician data lists 4 practice locations, including Yankton, SD, Tea, SD and Brookings, SD. Call before your visit to confirm the address.
- What is Guy M. Sullivan's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Guy M. Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Guy M. Sullivan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Guy M. Sullivan?
- (605) 331-5890, as listed in official Medicare / NPI Registry data.
- What is Guy M. Sullivan's NPI number?
- 1841642667. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Guy M. Sullivan works
Medicare's Facility Affiliation Data lists Guy M. Sullivan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Avera de Smet Memorial Hospital - CAHDe Smet, SD · Critical Access Hospital · CCN 431332
- Avera McKennan Hospital & University Health CenterSioux Falls, SD · Acute Care Hospital · CCN 430016
- Brookings Health SystemBrookings, SD · Acute Care Hospital · CCN 430008
- Sanford Usd Medical CenterSioux Falls, SD · Acute Care Hospital · CCN 430027
- Sioux Falls Specialty HospitalSioux Falls, SD · Acute Care Hospital · CCN 430090
Practice locations
Addresses where Guy M. Sullivan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1101 Broadway AveYankton, SD 57078 (605) 331‑5890
- 2120 Live Stronger StTea, SD 57064 (605) 331‑5890
- 407 22nd AveBrookings, SD 57006 (605) 331‑5890
- 810 E 23rd StSioux Falls, SD 57105
Group practices
Medicare enrollment lists Guy M. Sullivan as a member of this group (CMS data updated 2026-10-02).
- Orthopedic Institute PC57 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Yankton
Clinicians with the same Medicare primary specialty in Yankton, SD — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2016 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1841642667 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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