Main Office Phone:  231-487-2100
Billing:  231-487-2183
Toll Free:  855-487-2100

Center for Pulmonary & Sleep Medicine Providers


Dwayne M. Griffin, DO

Medical School: Michigan State University
Residency: Michigan State University Associated Hospitals
Fellowship: University of Wisconsin
Board Certifications: Internal Medicine/Pulmonary Disease/ Critical Care Medicine/Sleep Medicine

Dr. Dwayne Griffin is board certified in Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine. Dr. Griffin completed his medical training and residency at Michigan State University. He completed his fellowship training in Pulmonary, Critical Care and Sleep Medicine from the  University of Wisconsin.  Dr. Griffin is a Fellow of the American College of Chest Physicians and a member of the American Sleep Disorders Association. He is also an adjunct Professor with Michigan State University.

Practicing medicine for over 25 years, Dr. Griffin loves his work and helping his patients live healthy lives. When he is not working, Dr. Griffin enjoys tennis, biking, boating, and skiing.


Trudy E. Day, MSN, NP

School: Michigan State University
Board Certification: Nurse Practitioner
Specialties: Pulmonary Disease/Sleep Medicine

Nurse Practitioner Trudy Day has over 15 years clinical experience in sleep and pulmonary medicine.  After completing an undergraduate degree in nursing from Lake Superior State University, she earned a Master's of Science in Nursing in 1998 from Michigan State University.  She is a board certified Nurse Practitioner with a subspecialty in Geriatrics. 

Clinical interests include: sleep apnea, insomnia, restless legs syndrome, narcolepsy, parasomnias, emphysema, and asthma.  Trudy sees patients in Petoskey and has satellite offices in Cheboygan and Gaylord. 

In her free time, Trudy enjoys snowshowing and fishing with her husband.

tammy m milbocker msn np

Tammy M. Milbocker, MSN, NP

School: Graceland University, Independence, Missouri
Certification: MSN Degree/Family Nurse Practitioner
Specialties: Pulmonary Disease/Sleep Medicine


Sarah A. Adams, PA-C

School: Central Michigan University
Board Certification: Certified Physician Assistant
Specialties: Pulmonary Disease/Sleep Medicine


danielle n cook pac

Danielle N. Cook, PA-C

School: Grand Valley State University, Grand Rapids, MI
Certification: Masters of Physician Assistant Studies
Specialties: Pulmonary Disease/Sleep Medicine

CPSM Office Locations

The Center for Pulmonary & Sleep Medicine has multiple outreach locations to better to serve our patients’ needs.

  • Petoskey (main office)
  • Cheboygan
  • Gaylord