Quick answers
- Which hospitals does Diane Flershem work at?
- Medicare's official clinician data lists Diane Flershem at 5 hospitals: Advocate Lutheran General Hospital, Northshore University Healthsystem - Evanston Hospital, Northwest Community Hospital 1, Northwestern Lake Forest Hospital and Northwestern Medicine Central Dupage Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Diane Flershem see patients?
- Medicare's clinician data lists 1 practice location in Arlington Heights, IL. Call before your visit to confirm the address.
- What is Diane Flershem's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Diane Flershem accept Medicare assignment?
- Yes. Medicare's clinician data says Diane Flershem 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.
- Does Diane Flershem offer telehealth?
- Medicare's clinician data says Diane Flershem offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Diane Flershem?
- (847) 577-9300, as listed in official Medicare / NPI Registry data.
- What is Diane Flershem's NPI number?
- 1447205869. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Diane Flershem works
Medicare's Facility Affiliation Data lists Diane Flershem at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Lutheran General HospitalPark Ridge, IL · Acute Care Hospital · CCN 140223
- Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · CCN 140010
- Northwest Community Hospital 1Arlington Heights, IL · Acute Care Hospital · CCN 140252
- Northwestern Lake Forest HospitalLake Forest, IL · Acute Care Hospital · CCN 140130
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
Practice locations
Addresses where Diane Flershem is enrolled with Medicare (CMS data updated 2026-10-02).
- 3405 N Arlington Heights RdArlington Heights, IL 60004 (847) 577‑9300
Group practices
Medicare enrollment lists Diane Flershem as a member of this group (CMS data updated 2026-10-02).
- Riverside Medical S C8 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Arlington Heights
Clinicians with the same Medicare primary specialty in Arlington Heights, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rush Medical College Of Rush University |
| Graduation year | 1994 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1447205869 |
| 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