Quick answers
- Which hospitals does Mark L. Stillwell work at?
- Medicare's official clinician data lists Mark L. Stillwell at 2 hospitals: Mercy Hospital Fort Smith and Sequoyah County-City of Sallisaw Hospital Authorit…. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark L. Stillwell see patients?
- Medicare's clinician data lists 1 practice location in Fort Smith, AR. Call before your visit to confirm the address.
- What is Mark L. Stillwell's specialty?
- Medicare lists Infectious Disease as the primary specialty, and also Internal Medicine.
- Does Mark L. Stillwell accept Medicare assignment?
- Yes. Medicare's clinician data says Mark L. Stillwell 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 Mark L. Stillwell?
- (479) 274-4100, as listed in official Medicare / NPI Registry data.
- What is Mark L. Stillwell's NPI number?
- 1568459451. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark L. Stillwell works
Medicare's Facility Affiliation Data lists Mark L. Stillwell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital Fort SmithFort Smith, AR · Acute Care Hospital · CCN 040062
- Sequoyah County-City of Sallisaw Hospital Authorit…Sallisaw, OK · Acute Care Hospital · CCN 370112
Practice locations
Addresses where Mark L. Stillwell is enrolled with Medicare (CMS data updated 2026-10-02).
- 6801 Rogers Ave, Fl 5Fort Smith, AR 72903 (479) 274‑4100
Group practices
Medicare enrollment lists Mark L. Stillwell as a member of this group (CMS data updated 2026-10-02).
- Mercy Clinic Fort Smith Communities372 clinicians in the group
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in Arkansas
Clinicians with the same Medicare primary specialty in Arkansas — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Maryland School Of Medicine |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568459451 |
| 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