Mercy Clinics

Pulmonary & Sleep Medicine

Mercy Pulmonary & Sleep Medicine
540 E. Jefferson St. Ste. 301
Iowa City, IA 52245
Phone: 319-688-7779
Fax 319-887-2879  

Monday through Friday
8:30 a.m. - 5 p.m.

In-person and telehealth appointments


Andrew Ashby, MD
Dr. Ashby received his medical education from Indiana University, completed his residency at University of Iowa Hospitals and Clinics, and is certified by the American Board of Internal Medicine, Internal Medicine, Pulmonary Disease and Critical Care.
Ethan Emmons, MD
Dr. Emmons received his medical education from Uniformed Services University,
completed his residency at Walter Reed Army Medical Center, received his fellowship from Brooke Army Medical Center, and is certified by the American Board of Internal Medicine, with pulmonary disease and sleep medicine subspecialties.

Michael Hoffman, MD
Dr. Hoffman received his medical education from University of Wisconsin, completed his residency at University of Iowa Hospital & Clinics, and is certified by the American Board of Internal Medicine.

Specialized Expertise in:
  • Asthma
  • Chronic obstructive pulmonary disease
  • Emphysema
  • Exercise-induced asthma
  • Lung cancer
  • Occupational asthma
  • Pulmonary hypertension
  • Pulmonary infections
  • Tuberculosis
  • Wheezing

Video Series about Sleep Apnea and CPAP:

Treatments and Procedures:

  • Bronchoscopy
  • Cardiopulmonary stress testing
  • Chest tube placement
  • CPAP
  • Electromagnetic navigation bronchoscopy (ENB)
  • ENB placement of fiducial markers for stereotactic radiation
  • Endobronchial ultrasound for diagnosing
  • Peripheral lung lesions
  • Exercise laryngoscopy
  • Exercise oxygen desaturation
  • High altitude simulation testing
  • Linear endobronchial ultrasound for
  • Central lung lesions and lung cancer
  • Staging
  • Pleural biopsy
  • Polysomnography (sleep study)
  • Prevention education
  • Pulmonary function testing
  • Pulmonary rehabilitation
  • Pulmonary stress testing
  • Pulmonary therapy
  • Smoking cessation
  • Spirometry
  • Thoracentesis
  • Transthoracic needle biopsy
  • Ultrasound guided thoracentesis

Link to Mercy Iowa City's accredited Neurodiagnostic Sleep Center