Quick answers
- Which hospitals does Mariah Small-O'Sullivan work at?
- Medicare's official clinician data lists Mariah Small-O'Sullivan at 3 hospitals: CHI St. Vincent Hospital Hot Springs, Mena Regional Health System and National Park Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mariah Small-O'Sullivan see patients?
- Medicare's clinician data lists 3 practice locations, including Hot Springs National Park, AR, Rhinelander, WI and Stevens Point, WI. Call before your visit to confirm the address.
- What is Mariah Small-O'Sullivan's specialty?
- Medicare lists Otolaryngology as the primary specialty.
- Does Mariah Small-O'Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Mariah Small-O'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 Mariah Small-O'Sullivan?
- (501) 609-2368, as listed in official Medicare / NPI Registry data.
- What is Mariah Small-O'Sullivan's NPI number?
- 1477085249. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mariah Small-O'Sullivan works
Medicare's Facility Affiliation Data lists Mariah Small-O'Sullivan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- CHI St. Vincent Hospital Hot SpringsHot Springs, AR · Acute Care Hospital · CCN 040026
- Mena Regional Health SystemMena, AR · Critical Access Hospital · CCN 041334
- National Park Medical CenterHot Springs, AR · Acute Care Hospital · CCN 040078
Practice locations
Addresses where Mariah Small-O'Sullivan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Mercy Ln, Suite 106Hot Springs National Park, AR 71913 (501) 609‑2368
- 2251 N Shore Dr, Suite 100Rhinelander, WI 54501 (715) 361‑2000
- 824 Illinois AveStevens Point, WI 54481 (715) 344‑1600
Group practices
Medicare enrollment lists Mariah Small-O'Sullivan as a member of these groups (CMS data updated 2026-10-02).
- Aspirus Rhinelander and Tomahawk Hospitals and Clinics, Inc.574 clinicians in the group
- CHI St Vincent Medical Group Hot Springs185 clinicians in the group
Specialties
- Otolaryngologyprimary
Other ENT doctors in Arkansas
Clinicians with the same Medicare primary specialty in Arkansas — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Arkansas College Of Medicine |
| Graduation year | 2017 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477085249 |
| 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