Zmedi Group is proud to have achieved Meaningful Use Stage 2 Attestation set by CMS (Center for Medicare & Medicaid Services) for quality of patient care and accessibility.

Meet Our Physicians and Staff

Our doctors use the highest quality of medical care to help you establish and maintain a healthy lifestyle. Together, we’ll develop a patient-doctor relationship built on communication, trust and compassion. We care for your whole person – your health needs and your life goals  – and help you make choices that will ensure your preferred lifestyle for years to come.

Asad Zaman M.D., Internal Medicine, Board-certified

Dr. Zaman believes that a positive partnership between doctor and patient based on trust, compassion and an open line of communication enhances and improves patient care.

  • Graduated from Dhaka Medical College, Bangladesh, 1988
  • Completed residency at Weiss Memorial University of Chicago, IL, 1995
  • Board-certified, 1996 and 2006
  • Founded Zmedi, 1999
  • Served as Chairman for the Advocate South Suburban Hospital Department of Medicine 2011
  • Medical Director at Symphony of Crestwood
  • Medical Director at ManorCare Homewood
  • Medical Advisor for Health Directions Inc.
  • Active participating member of
    • Chicago Medical Informatics Organization
    • American College of Physicians
    • American Medical Directors Associations.
  • General health and wellness of adult and geriatric patients
  • On-staff at
    • Advocate South Suburban Hospital
    • Advocate Christ Hospital
    • Ingalls Hospital
    • Silver Cross Hospital (pending)
  • Fluent in English


Sandhya Nagubadi M.D., Internal Medicine, Board-certified

Dr. Nagubadi joined the Zmedi family in 2005 and is particularly interested in helping patients suffering from critical conditions manage their symptoms.

  • Graduated from Osmania Medical College in Hyderabadm, India, 1998
  • Externship at Baylor College of Medicine in Houston, Texas focused on General Surgery, Cardiology, and Dermatology
  • Completed residency at Wright State University in Dayton, Ohio, 2004
  • Board-certified in 2007
  • General health and wellness of adult and geriatric patients
  • On-staff at
    • Advocate South Suburban Hospital
    • Ingalls Hospital
    • Palos Community Hospital
  • Fluent in English, Hindi and Telegu

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Georgios Karanastasis, MD., Internal Medicine, Board-certified

Dr. Karanastasis, a native of Greece, excelled in mathematics and science early in life and was inspired to become a physician because his birthplace of Kos Island was also home to Hippocrates, the father of medicine.  Now a resident of Orland Park, Dr. Karanastasis continues his life’s mission of community care. He enjoys using the full scope of his internal medicine competencies in treating his patients and treats each of his patients with dignity, kindness, and compassion.

  • Graduated from University of Athens Medical School, 1999
  • Research Fellow in cardiovascular medicine at the University of Athens, 2002-2004
  • Primary care physician, Greece 1999-2002
  • Completed residency at John H. Stroger Hospital of Cook County, 2008
  • Board-certified 2009
  • General health and wellness of adult and geriatric patients
  • Cardiovascular disease
  • Cancer prevention
  • On-staff at
    • Advocate South Suburban Hospital
    • Advocate Christ Hospital
    • Palos Community Hospital
  • Fluent in Greek and English


Reenu Varghese, Certified Nurse Practitioner

Reenu’s philosophy of care is in close alignment with the World Health Organization’s declaration that “health is a state of complete physical, mental, social and spiritual wellbeing and not merely the absence of disease or infirmity.” Her goal as your nurse practitioner is to promote health, prevent illness, promote a safe environment and increase awareness among individuals and communities. Devoted to improving the quality of life for patients, Reenu is the energetic Founder of Zmedi House Calls.

  • Bachelor of Science in Nursing from Olivet Nazerene University in 2005
  • Masters of Science in Nursing from North Park University in Chicago, 2010.
  • Currently pursuing Doctorate of Nursing at University of Illinois, Chicago
  • Distinguished Phi Theta Kappa Scholars Society
    • Chairman of the Student Nurses Association, 2001
  • Awarded Top Nurse, Healthcare Providers of Excellence, International Nurses Association June 2013
  • Member, American Academy of Nurse Practitioners
  • Member, American Academy of Home Care Physicians
  • Associate Member, American College of Physicians
  • Fluent in English, Hindi, Malayalam and basic Spanish.