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Availability last updated 07/29/2026
William Crevier, MD, is a board-certified internal medicine and pediatrics physician at The Center for Primary Healthcare in Orland Park, Illinois. He is also the president and medical director of the practice and cares for patients of all ages: from infants through adults.
Dr. Crevier grew up in Vermont. He attended the University of California at Berkeley, graduating magna cum laude with a degree in Biochemistry. He received his medical degree from the University of Chicago and completed his residency at Loyola University Medical Center in Maywood, Illinois. He’s an advocate for access to care and served as the founding executive director of two Christian community health centers.
Dr. Crevier sincerely enjoys getting to know his patients. He gives each and every patient the time and attention they deserve in a warm, welcoming atmosphere.
Dr. Crevier maintains his advanced credentials to stay up-to-date with the latest advances in internal medicine.
Dr. Crevier has welcomed a resident to his practice; Dr. Carol Crevier who is a new Family Nurse Practitioner. Carol is known by many of the CPHC patients from her time as a nurse and administrator within his practice. Dr. Crevier also frequently has medical students shadow him for a day.
The Creviers are currently accepting new patients and are excited to welcome them to the practice.
Dr. William Crevier, MD
Internist
16450 104th Ave.
Suite 101
Orland Park, IL 60467
Felix Obregon
Internist
1971 Gowdey Rd, Ste 205
Naperville, IL 60563
Robert Winiecki, MD
Internist
1500 Eisenhower Ln
Ste 700
Lisle, IL 60532
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Michael Favila, DO, is a board-certified family medicine physician on the team at Health Solutions. He provides comprehensive care for patients at the practice’s convenient offices in Tinley Park, Illinois, and in Munster, Indiana.
Dr. Favila completed his undergraduate studies at Indiana University in Bloomington, earning his Bachelor of Science in microbiology. He went on to earn his Doctor of Osteopathic Medicine from Chicago College of Osteopathic Medicine in Downers Grove, Illinois, graduating in 2017.
Following medical school, Dr. Favila completed his residency in family medicine at Franciscan Health Olympia Fields. He was named Family Medicine Chief Resident in his final year.
At Health Solutions, Dr. Favila provides the full scope of family medicine services, including annual physical exams and the management of conditions such as diabetes, high blood pressure, and high cholesterol. In addition to being certified by the American Board of Family Medicine, Dr. Favila holds a PCSS Medications for Addiction Treatment (MAT) Certification to help patients who are suffering from substance use disorder.
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Dr. Michael Favila, DO
Family Physician
16650 S Harlem Avenue
Suite 6
Tinley Park, IL 60477
Dr. Firas Zakaria is an internal medicine specialist with offices in Palos Heights, Illinois. He welcomes residents from Palos Heights and its surrounding communities to experience health care that’s focused on wellness and creating long-term patient-physician relationships. His practice is a patient-first approach that includes safe and effective management of both acute illnesses and long-term chronic diseases such as diabetes, heart disease, and hypertension.
Dr. Zakaria combines his extensive medical training and skill with a passion for optimizing the health and well-being of every patient. He received his medical degree from the prestigious Damascus University School of Medicine. He completed a residency program in pathology at the University of Damascus and a second residency in internal medicine at Chicago’s Mercy Hospital and Medical Center.
As a primary care physician, Dr. Zakaria is skilled in supervising all facets of his patients’ health. He’s well known for his longer than average appointment times, which allow him the opportunity to truly understand the needs and concerns of his patients. Rather than simply writing a prescription for high-risk medications such as narcotics or sedatives for symptom management, Dr. Zakaria is dedicated to discovering and resolving the underlying issues causing those symptoms.
His comprehensive approach to patient care includes being available to his patients for same-day or next-day appointments when necessary. He’s also an experienced hospitalist who continues to follow his patients during hospitalizations and after acute care/emergency department visits.
Dr. Mhd Firas Zakaria, MD
Internist
13305 S Ridgeland Ave
Palos Heights, IL 60463
John Ibrahim, MD
Internist
6935 Fieldstone Dr
Willowbrook, IL 60527
Saira Khanna MD is a board-certified medical and surgical retina specialist at Retina Consultants Ltd. Dr. Khanna earned her undergraduate degree in Neurobiology with minors in Spanish and Economics at Harvard University in Cambridge, Massachusetts. She attended the University of Wisconsin School of Medicine and Public Health for medical school. She completed her ophthalmology residency at the University of Chicago and continued her medical training in vitreoretinal surgery, completing her fellowship at The Retina Institute in St. Louis, MO. Dr. Khanna's areas of expertise include diabetic retinopathy, macular degeneration, retinal vascular diseases, macular holes, epiretinal membranes, uveitis, and other retinal pathologies. In her free time, Dr. Khanna enjoys playing tennis/pickleball, eating at new restaurants, and traveling.
Saira Khanna, MD
Ophthalmologist
7831 W. 95th Street
Suite C
Hickory Hills, IL 60457
Hameed Ali, D O
Internist
55 West 22nd Street
#160
Lombard, IL 60148
Mustafa Sayeed, DO
Internist
1919 S Highland Ave Ste B300
Lombard, IL 60148
David Chiou, MD
Internist
1300 S Main St
Lombard, IL 60148
