Summary

Dr. Clay Demattei is a surgeon with 45 years of experience serving patients in Marion, Illinois. He earned his medical degree from Loyola University of Chicago Stritch School of Medicine and completed his residency at Marshall University School of Medicine. His extensive background in surgery allows him to provide comprehensive care for a wide range of surgical needs. Dr. Demattei is fluent in both English and Spanish, enabling him to communicate effectively with diverse patient populations.

Dr. Demattei practices at several locations throughout Marion and maintains affiliations with Deaconess Illinois Medical Center and Marion Va Medical Center. He specializes in treating conditions such as colon polyps, diverticular disease, and diverticulosis. His expertise includes performing colonoscopies and lower GI endoscopy procedures with sedation to ensure patient comfort. Patients consistently rate his care highly, giving him an average rating of 4.8 out of 5 stars on Vitals.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4.8
  • 45 years of experience
  • speaks English, Spanish
  • Marshall University School Of Medicine
  • 3 written reviews
  • 2 specialties
  • 2 areas of expertise
  • 2 hospital affiliations
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. Clay Ohara Demattei has 3 locations

Heartland Surgery Llc

3402 Office Park DrMarion, IL 62959
Mon8:30 am - 4:30 pm
Tue8:30 am - 4:30 pm
Wed8:30 am - 4:30 pm
Thu8:30 am - 4:30 pm
Fri8:30 am - 4:30 pm
SatClosed
SunClosed

Marion Healthcare Surgery Center

3003 Civic Circle Blvd Ste 200Marion, IL 62959
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Deaconess Illinois Medical Center

3333 W Deyoung StMarion, IL 62959

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Dr. Clay Ohara Demattei I, MD
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Dr. Clay Ohara Demattei I, MDDr. Marsha G Ryan, MDDr. Rollin Morris Perkins IVDr. Lloyd Neal Mccain, MD
SurgerySurgeryOtherSurgery
Accepts New Patients
4.8 
45 Years of Experience 54 Years of Experience 50 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English
Marion , ILCarbondale , ILCarbondale , ILCarbondale , IL
Med School: Loyola University Of Chicago Stritch School Of Medicine Med School: University Of Oklahoma College Of Medicine Med School: Southern Illinois University School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. Clay Ohara Demattei

  • Accepts Medicare
  • Accepts Medicaid

Medical Specialties

Dr. Clay Ohara Demattei has the following 2 specialties

Specialty Expertise

Dr. Clay Ohara Demattei has the following 2 areas of expertise

  • Laparoscopic Surgery (Laparoscopy)
  • Other

Certifications, License, & Education

45 Years Experience

Dr. Clay Ohara Demattei holds an expired medical license in the state of Illinois.

Medical License

Medical Doctor with an expired medical license in the state of Illinois that expired in 2026.

Education & Training

Residency

Completed their residency at Marshall University School Of Medicine.

Medical School

Graduated from Loyola University Of Chicago Stritch School Of Medicine in 1981.

NPI Number

Dr. Demattei's NPI number is 1881621910.

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Frequently Asked Questions

Does Dr. Clay Demattei accept virtual/telehealth appointments?
Dr. Clay Demattei has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Which hospitals is Dr. Clay Demattei affiliated with?
Dr. Clay Demattei is affiliated with Deaconess Illinois Medical Center and Marion Va Medical Center.
Where is Dr. Clay Demattei's office located?
Dr. Clay Demattei's office is located at 3402 Office Park Dr, Marion, IL, 62959.
Does Dr. Clay Demattei accept my insurance?
You can see the insurance plans that Dr. Clay Demattei accepts on their Vitals profile.
Is Dr. Clay Demattei accepting new patients?
Dr. Clay Demattei is accepting new patients on Vitals. View Dr. Clay Demattei's profile on Vitals to make an appointment.

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