Quick answers
- Which hospitals does Dennis Kellar work at?
- Medicare's official clinician data lists Dennis Kellar at 5 hospitals: Advocate Good Shepherd Hospital, Advocate Illinois Masonic Medical Center, Advocate Sherman Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Medicine McHenry. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Dennis Kellar see patients?
- Medicare's clinician data lists 1 practice location in Algonquin, IL. Call before your visit to confirm the address.
- What is Dennis Kellar's specialty?
- Medicare lists Pulmonary Disease as the primary specialty, and also Critical Care (Intensivists) and Internal Medicine.
- Does Dennis Kellar accept Medicare assignment?
- Yes. Medicare's clinician data says Dennis Kellar 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 Dennis Kellar offer telehealth?
- Medicare's clinician data says Dennis Kellar offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Dennis Kellar?
- (815) 477-7350, as listed in official Medicare / NPI Registry data.
- What is Dennis Kellar's NPI number?
- 1679683866. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Dennis Kellar works
Medicare's Facility Affiliation Data lists Dennis Kellar at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Good Shepherd HospitalBarrington, IL · Acute Care Hospital · CCN 140291
- Advocate Illinois Masonic Medical CenterChicago, IL · Acute Care Hospital · CCN 140182
- Advocate Sherman HospitalElgin, IL · Acute Care Hospital · CCN 140030
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Medicine McHenryMcHenry, IL · Acute Care Hospital · CCN 140116
Practice locations
Addresses where Dennis Kellar is enrolled with Medicare (CMS data updated 2026-10-02).
- 1340 Ryan PkwyAlgonquin, IL 60102 (815) 477‑7350
Group practices
Medicare enrollment lists Dennis Kellar as a member of this group (CMS data updated 2026-10-02).
- Northwest Pulmonary and Sleep Medicine SC2 clinicians in the group
Specialties
Other pulmonologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1679683866 |
| 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