Dr. Dennis Kellar, MD

Critical Care Medicine  |  
Male  |  
Age 48
Insurances AcceptedSave
Dr. Dennis Kellar, MD
Dr. Dennis Kellar, MD is a critical care medicine doctor who practices in Crystal Lake, IL. He is 48 years old and has been practicing for 20 years. Dr. Kellar is affiliated with Advocate Sherman Hospital, Centegra Hospital - McHenry, Centegra Hospital - Woodstock and Advocate Good Shepherd Hospital.

NW Pulmonary Sleep Wellness

360 Station Dr Ste 230

Crystal Lake, IL 60014

Contact Information

(815) 477-7350

Dr. Dennis Kellar, MD

Dr. Dennis Kellar, MD

Accepted insurance

  • Aetna
  • Blue Cross Blue Shield
  • Cigna
  • First Health (Coventry Health Care)
  • HealthLink
  • Humana
  • MultiPlan

*Please verify this information when scheduling an appointment.

Learn about Dr. Kellar

Dr. Kellar's Experience

Dr. Kellar's experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Critical Care Medicine
  • No malpractice claims found
  • No sanctions found
  • No board actions found


  • Critical Care Medicine
  • Pulmonology
  • Sleep Medicine

Board Certifications

Dr. Kellar does not have any board certifications listed.


Conditions Treated

  • Abscess
  • Acidosis
  • Acute Bronchitis
  • Acute Lower Respiratory Infection
  • Acute Pharyngitis
  • Alkalosis
  • Asbestosis
  • Asthma
  • Autoimmune Diseases
  • Blastomycosis
  • Bronchiectasis
  • Bronchitis
  • Bronchospasm
  • COPD (Chronic Obstructive Pulmonary Disease)
  • Chronic Pulmonary Heart Diseases (incl. Pulmonary Hypertension)
  • Classic Polyarteritis Nodosa
  • Collapsed Lung (Pneumothorax)
  • Common Cold
  • Cough
  • Emphysema
  • Empyema
  • Fungal Infections
  • Hypersensitivity Pneumonitis
  • Influenza (Flu)
  • Interstitial Lung Disease
  • Low Blood Oxygen Level
  • Lung Abscess
  • Lung Cancer
  • Lung Neoplasms, Not Specified as Malignant
  • Lung Nodule
  • Metastatic Respiratory System Cancer
  • Mycobacterial Lung Infection
  • Partial Lung Collapse
  • Pleural Effusion
  • Pneumoconiosis and Pneumonopathy
  • Pneumonia
  • Pneumonitis (Due to Solids or Liquids)
  • Primary Pulmonary Hypertension
  • Pulmonary Disease
  • Pulmonary Edema
  • Pulmonary Embolism
  • Pulmonary Hypertension
  • Pulmonary Insufficiency
  • Respiratory Failure
  • Respiratory Syncytial Virus
  • Sarcoidosis
  • Shortness of Breath
  • Sinusitis
  • Sleep Apnea
  • Sleep Disorders
  • Thrombosis
  • Tuberculosis
  • Valley Fever
  • Vascular Disease
  • Wegener's Granulomatosis
  • Wheezing


Read More


  • Arterial Blood Gas Test (ABG)
  • Bronchoscopy
  • Continuous Positive Airway Pressure (CPAP)
  • Pulmonary Function Test
  • Respiratory Management
  • Thoracentesis

Background Check

0 Malpractice Claims

No malpractice history found for Illinois.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Ross U Sch Of Med
    Medical School | Graduated 1997
  • Cook Cty Hosp
    Internship Hospital | Completed
  • Cook Cty Hosp
    Residency Hospital | Completed 2001
  • Rush University Medical Center
    Fellowship Hospital | Completed 2004

Awards & Recognition

Awards & Honors

Dr. Kellar has no awards or honors listed.

Media & Publications

Dr. Kellar has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Kellar does not have any memberships or affiliations listed. If you are Dr. Kellar and would like to add memberships or affiliations, please update your profile.

Dr. Kellar's Reviews

Likelihood of recommending Dr. Kellar to family and friends
based on 33 total reviews (8 with comments)
Dr. Kellar's Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    16 to 30 minutes
Patient Comments (8)
in Barrington, IL |
Sadly I spent 11/2 years under the care of Dr. K for sleep apnea and didn't improve but actually got worse. I received little education on the dos and donts like not letting pets in your bed. Though I complained about not feeling refreshed when I awoke, Dr. K never tried changing the pressures. When the readings indicated the mask was allowing air to escape,(leaking) he offered no fix. Now I'm with a new doc who did a new study, made pressure changes and after only 3 nights, I see some ??Change
Trevor, WI |
Warm, compassionate doctor.
Carpentersville, IL |
Initial meetings (2) were fine. Would you wait for OVER an hour in an exam room and have no one tell you what's going on? Would you accept a doctor who says that your numbers a fine despite the fact that you're telling the doctor that you aren't getting any sleep? Would you trust a doctor who bills your insurance even though they didn't see you? Receptionist staff has to be one of the rudest group I've ever come across.
in Lake County, Illinois |
Dr. Kellar seems to be both personable and knowledgeable. I have tremendous faith in him. I have found that his office and support staff is just terrible. There is a tremendous disconnect between Doctor, staff, and patient. Why should a simple question take multiple calls to the office and several days waiting to be answered??
in Cary, IL |
Dr. Keller found and treated a condition I had with sleep apnea, needing oxygen at night. My life has been vastly improved. Iam greatly appreciative for having found him ,the nurse practitioner Amanda , great practice , and their professiona staff and kind manner .
in Lake in the Hills, IL |
I was surprised how easy it was to get an appointment within a short amount of time. I didn't have to wait long in the office to see Dr Kellar like I do at other specialists. He answered all my questions but still made my appointment quick and concise. I also had experience with his respiratory therapist Melissa, she was great as well. All around a great couple of visits!!
in Huntley, IL |
The Doctor is ok but the staff is poorly trained in customer service and have even taken parts of a device that of course I was billed for. and getting to talk with their billing Department is a joke 10 calls and always get their voicemail promising to call back and never do.
in Crystal Lake, IL |
Some staff seem to not listen well and rush you through the processes
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Now Accepting New Patients
Dr. Kellar accepts 7 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • Blue Cross Blue Shield
    Blue Card PPO
  • Cigna
    Cigna HMO
    Cigna PPO
    Open Access Plus
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • HealthLink
    HealthLink PPO
  • Humana
    Choice Care PPO
  • MultiPlan
    MultiPlan PPO
    PHCS Network PPO

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Kellar has admitting privileges

Advocate Good Shepherd Hospital
450 W Il Route 22
Barrington, IL 60010
View Hospital Profile
Centegra Hospital - McHenry
4201 W Medical Center Dr
McHenry, IL 60050
View Hospital Profile
Centegra Hospital - Woodstock
3701 Doty Rd
Woodstock, IL 60098
View Hospital Profile
Advocate Sherman Hospital
1425 N Randall Rd
Elgin, IL 60123
View Hospital Profile

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