We are thankful you have chosen our practice as your trusted resource for oncology or hematology care. Our Duluth office is conveniently located near Gwinnett Place Mall to conveniently serve all of our central north Gwinnett patients.

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Our Duluth office is partnered with Northside Gwinnett 3620 Howell Ferry Rd in Duluth. We can be found in the Physicians Building on the 4th floor.

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Helpful office information:

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Physicians: Duluth is served by 3 primary physicians- 

Dr. Chris Hagenstad

Dr. I-Wan Chang

Dr. Haris Hatic

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Nurse Practitioners:

Barbara O'Callaghan, NP

Nan Park,NP

Grace Thompson Bell, NP

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Office hours: The office is open from 7:30 am to 5:00 pm, phone lines open at 8:30 am. Nurses are available from 8:30 am until 5:00 pm. Physician appointments are from 9:00 am until 4:00 pm. Our main office line is 770.623.6433.

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Nurse Line:  Each office has as nurse line that you can call for any medical questions and concerns.  You will be prompted to leave a message for the nursing staff.  We have a nurse on call during business hours who checks the voicemail hourly and works closely with your physician to address your needs.  Calls will be returned by the end of the business day in the order of urgency. All messages left after 4:00 PM may not be returned until next business day. For all disability and FMLA paperwork please bring it to our office. Turnaround time is 7 to 10 business days.Our Duluth nurse line is 762.261.0989

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After Hours: If you are in need of medical advice after our office is closed, please dial our main number and our 'after hours' service will answer. They in turn will take your message and contact the physician on call for that day. You must disable your caller id block in order for the doctor to return your call. Please be aware that after hour calls may not be returned by the physician that you normally see in our office.