Quick answers
- Does Alyssa D. McMillen accept Medicare assignment?
- Yes. Medicare's clinician data says Alyssa D. McMillen 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.
- What is Alyssa D. McMillen's NPI number?
- 1790595635. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alyssa D. McMillen works
Medicare's Facility Affiliation Data lists Alyssa D. McMillen 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.
- Franklin HospitalBenton, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141321
- Herrin HospitalHerrin, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 140011
- Marshall Browning HospitalDu Quoin, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141331
- Memorial Hospital of CarbondaleCarbondale, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 140164
- St Joseph Memorial HospitalMurphysboro, IL · Critical Access Hospital · Emergency services: listed by Medicare · CCN 141334
Practice locations
Addresses where Alyssa D. McMillen is enrolled with Medicare (CMS data updated October 2, 2026).
- 100 Dr Warren Tuttle DrHarrisburg, IL 62946 (618) 252‑0999
- 409 W Oak StCarbondale, IL 62901 (618) 529‑4455
Group practices
Medicare enrollment lists Alyssa D. McMillen as a member of this group (CMS data updated October 2, 2026).
- Southern Illinois Medical Services NFP334 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Harrisburg
Clinicians with the same Medicare primary specialty in Harrisburg, IL — not a recommendation.
Other clinicians in Southern Illinois Medical Services NFP
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2024 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790595635 |
| 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
- 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