About Consultants in Gastroenterology

Professional and Compassionate Care

Since 1991, Consultants in Gastroenterology has served patients throughout the Midlands. We provide comprehensive, state-of-the-art, patient-centered care in a compassionate and timely manner.

Each of our services includes patient education, clear communication, and emotional support to alleviate anxiety and optimize comfort. We specialize in the diagnosis and treatment of the digestive system, including the esophagus, stomach, intestines, gallbladder, pancreas, and liver.

We’d love to meet you.

We make it our mission to provide you with the best care available in the Midlands.

Meet The Team

Meet Our Physicians

Gregory Scott Bills, MD

James A. Richter, FACG

John W. Schaberg, MD, FACG

March E. Seabrook, MD, FACG

Nelson E. Seabrook, MD

Erick R. Singh, MD

Gene W. Stuart, MD

Matthew N. Thoma, FACG

Rajeev Vasudeva, MD, FACG

Joshua L. Wilson, MD

Vasa W. Cate, MD, Retired

Eric J. Heinzelmann, MD, Retired

Richard M. Lawson, MD, Retired

S. Gabe Saleeby, MD, Retired

Advanced Practice Providers

Mallory Anderson, MSN, FNP-BC

Amanda W. Charlton, MSN, APRN, NP-C

Merritt Stevenson, MSN, FNP-BC

Caleb Weathersby, MSN, NP-BC

Tina Jordan, MSN, NP-BC

Awards & Associations

What type of visit do you need?

Gregory Scott Bills, MD

Managing chronic gastrointestinal disorders along with cancer screening and prevention are the core of my practice. I completed additional training in advanced endoscopic therapies so I can provide the care my patients need. Gastroenterology is an evolving field and I will continue to learn and expand my knowledge and skills.

Hometown: Salt Rock WV

Undergraduate Degree: Marshall University, Huntingdon, WV, BS in Biology

Medical Degree: Marshall University Joan C Edwards School of Medicine, Huntingdon, WV

Residency: University of Louisville, Louisville, KY

GI Fellowship: University of Kentucky, Lexington, KY

Board Certifications: Gastroenterology & Internal Medicine

Memberships: American College of Gastroenterology

James A. Richter, FACG

While giving my patients the personal attention, comfort, compassion and concern to meet their prevention and treatment needs, I will also strive to improve the quality of their lives through contributing research, continuing education and professional experience with the latest medical advancements and technologies.

Hometown: Fort Dix, New Jersey

Undergraduate Degree: Furman University, Greenville SC, BA in Health & Exercise Science

Medical Degree: University of South Carolina School of Medicine, Columbia SC, Magna Cum Laude in Medicine

Residency: University of Virginia Health System, Charlottesville, VA

GI Fellowship: University of Virginia Health System, Charlottesville, VA

Board Certifications: Gastroenterology, Hepatology & Internal Medicine

Membership: American College of Gastroenterology, American Association for the Study of Liver Diseases, American Gastroenterology Association, Alpha Omega Alpha Medical Honor Society

Noteworthy: Co-Author of Six Research Publications, Three Research Abstracts and Three Research Presentations

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

John W. Schaberg, MD, FACG

Providing excellent gastrointestinal care to patients in the Midlands is my continual goal.

Hometown: Raised in a Navy family, living on the East and West Coasts

Undergraduate Degree: North Carolina State University, Raleigh NC; BS in Zoology

Medical Degree: University of North Carolina School of Medicine, Chapel Hill, NC

Residency: University Medical Center of Eastern Carolina, Greenville, NC

GI Fellowship: University of South Carolina School of Medicine, Columbia SC

Board Certifications: Gastroenterology & Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; Lexington Medica Association; American Medical Association; American College of Physicians; American Society of Gastrointestinal Endoscopy; American Gastroenterological Association

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

March E. Seabrook, MD, FACG

Colon cancer is the second leading cause of cancer death in the US – and every four minutes, someone is diagnosed. Our state has a higher rate for those diagnosed with colon cancer than the national average. It is my life’s work to do something to change that.

Hometown: Anderson, SC

Undergraduate Degree: Wofford College, Spartanburg, SC, Cum Laude with a BS in Biology

Medical Degree: University of South Carolina School of Medicine, Columbia SC

Residency: University of South Carolina School of Medicine, Columbia SC

GI Fellowship: University of South Carolina School of Medicine, Columbia SC

Board Certifications: Gastroenterology & Internal Medicine Membership: SC Medical Association; Lexington Medical Association; American Medical Association; American College of Gastroenterology; American Board of Quality Assurance and Utilization Review

Noteworthy: Founding Member & Past President of the SC Gastroenterology Association; Past Chief of Medical Staff at Lexington Medical Center

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Nelson E. Seabrook, MD

Gastroenterology provides an opportunity to help patients through acute illness and optimize chronic disease as well as the reward of knowing you have the ability to prevent colon cancer by performing appropriately timed colonoscopies. I take pride in developing a relationship with my patients and their families. By staying up to date on the most current medical literature I am committed to improving patients’ overall digestive and nutritional health.

Hometown: Anderson, SC

Undergraduate Degree: Wofford College, Spartanburg, SC, BS in Biology

Medical Degree: Medical University of South Carolina, Charleston, SC

Residency: University of Louisville, Louisville, KY GI Fellowship: Medical University of South Carolina, Charleston, SC Medical University of SC, Charleston SC, Clinical and Endoscopic Outcomes, Quality Improvement; University of Louisville, Louisville, KY, Hepatology and Nutrition Board

Certifications: Internal Medicine; Gastroenterology

Membership: American Gastroenterology Association, American College of Gastroenterology, American Society for Gastrointestinal Endoscopy; American Medical Association; South Carolina Gastroenterology; South Carolina

Noteworthy: Chief Medical Resident, University of Louisville, Louisville, KY; Duke University, Fuqua School of Business, Durham, NC; Master of Management Studies

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Erick R. Singh, MD

Through my extensive training in gastroenterology and hepatology, with particular interest in pancreatobiliary and esophageal motility abnormalities, I strive to help and understand my patients while treating them with the respect, dignity, and compassion that they deserve.

Hometown: Greenwood, South Carolina

Undergraduate Degree: University of South Carolina, Columbia, SC, Cum Laude with BS in Chemical Engineering

Medical Degree: Medical University of South Carolina, Charleston, SC

Residency: Medical University of South Carolina, Charleston, SC

GI Fellowship: Georgia Regents University (formerly Medical College of Georgia), Augusta, GA

Board Certifications: Gastroenterology, Internal Medicine Membership: American Gastroenterology Association; American College of
Gastroenterology; American Society for Gastrointestinal Endoscopy

Noteworthy: Co-Author of Three Research Publications and Two Textbook Chapters, 20+ Research Abstracts and Presentations

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Gene W. Stuart, MD

Patients should expect their doctors to be healers, preventers, listeners and educators – which is my daily mission when caring for my patients.

Hometown: Greenville, SC

Undergraduate Degree: Duke University, Durham NC, BA in Political Science

Medical Degree: Medical University of South Carolina, Charleston SC

Residency: University of Florida Health Science Center, Jacksonville FL

GI Fellowship: University of North Carolina, Chapel Hill NC

Board Certifications: Gastroenterology & Internal Medicine

Membership: American Gastroenterology Association; American College of Gastroenterology; American Society for Gastrointestinal Endoscopy; American Medical Association; SC Medical Association; SC Gastroenterology Association

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Matthew N. Thoma, FACG

With a subspecialty in Endoscopic Ultrasound and the first to offer this procedure in the Midlands, I am trained and experienced in providing a more detailed diagnosis of gastrointestinal cancers, chronic conditions of the pancreas and hepatobiliary system, as well as, nodules in the intestinal walls resulting in improved treatment outcomes.

Hometown: Aiken, South Carolina

Undergraduate Degree: The Citadel, Charleston SC, BS in Biology

Medical Degree: University of South Carolina, Columbia, SC

Residency: Wake Forest University, Winston-Salem, NC

GI Fellowship: Cleveland Clinic Florida, Weston, FL

Board Certifications: Gastroenterology & Internal Medicine

Membership: American Gastroenterology Association; American College of Gastroenterology; American Society for Gastrointestinal Endoscopy

Noteworthy: Chief Resident, Wake Forest

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Rajeev Vasudeva, MD, FACG

Applying my academic medical background to private practice has enhanced my abilities to take care of difficult complicated patients. Having spent most of my career training other doctors to be gastroenterologists, I have realized that your endoscopy is only as good as your endoscopist. Be choosy. Ask questions.

Hometown: Cairo, Egypt

Medical Degree: Government Medical College, Amritsar Punjab, India

Residency: Case Western Reserve University, Cleveland OH

GI Fellowship: Southern Illinois University School of Medicine, Springfield IL

Board Certifications: Gastroenterology & Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; American College of Gastroenterology; American Gastroenterology Association; American Society of Gastrointestinal Endoscopy; Columbia Medical Society; Crohn’s & Colitis Foundation.

Noteworthy: Fellow, American College of Gastroenterology; Past Professor of Medicine and Director for Division of Digestive Diseases & Nutrition for USC School of Medicine

Hospital Affiliations: Lexington Medical Center, Palmetto Health Richland, MUSC Health Columbia

Joshua L. Wilson, MD

Quality patient care and the development of long-term relationships with my patients are my most important goals in medicine. It takes considerable time and effort to stay up-to-date on the most current medical literature and I take pride in going that extra mile for my patients. I promise to apply myself to each and every patient, as well as their families, in order to provide the best patient care.

Hometown: Dayton, OH

Undergraduate Degree: Wright State University, Dayton, Ohio

Medical Degree: Wright State University School of Medicine, Dayton, Ohio Residency: Wake Forest Baptist Health, Winston-Salem, NC Clinical

Clinical Research: Wake Forest Baptist Health, Winston-Salem, NC

GI Fellowship: Wake Forest Baptist Health, Winston-Salem, NC

Board Certifications: Gastroenterology & Internal Medicine

Membership: American Gastroenterology Association, American College of Gastroenterology, American Society for Gastrointestinal Endoscopy;
American Medical Association

Noteworthy: 2017-18 Chief Fellow and 2012-2016 Lead Researcher for Nine Abstracts at Wake Forest Baptist Health, 2004-2008 Dean’s List at
Wright State University

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Vasa W. Cate, MD, Retired

I was so fortunate to fulfill my dream of caring for others through the practice of internal and gastroenterology medicine. While I miss my many patients, I am enjoying retirement and spending more time with family and friends.

Hometown: Columbia, SC

Undergraduate Degree: University of SC, Columbia SC

Medical Degree: University of South Carolina School of Medicine, Columbia SC, Magna Cum Laude in Medicine

Residency: US Navy

Board Certifications: Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; American Medical Association; American College of Physicians; American Society of Internal Medicine; BB&T Board of Directors; and Lexington County Gamecock Club (Past President)

Noteworthy: Founding member of Consultants in Internal Medicine, which later changed in 1991 to Consultants in Gastroenterology.

Medical Status: Retired

Eric J. Heinzelmann, MD, Retired

My gastroenterology fellowship at USC introduced me to South Carolina. I had the privilege of serving patients with health care needs at Consultants in Gastroenterology for many years. I can’t imagine calling any other place home during my retirement from practicing medicine.

Hometown: Milwaukee, WI

Undergraduate Degree: University of Alabama, Tuscaloosa AL, Cum Laude with a BS in Chemistry

Medical Degree: University of South Alabama School of Medicine, Mobile AL

Residency: University of South Alabama Medical Center, Mobile AL

GI Fellowship: University of South Carolina School of Medicine, Columbia, SC

Board Certifications: Gastroenterology & Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; American College of Gastroenterology; American Gastroenterological Association; American Society for Gastrointestinal Endoscopy; American Medical Association

Noteworthy: Assistant Professor of Medicine at the University of South Carolina; Chief of Gastroenterology at Dorn VA Medical Center.

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Richard M. Lawson, MD, Retired

Serving my community by providing care through my field of gastroenterology and internal medicine has been incredibly rewarding.

Hometown: Columbia, SC

Undergraduate Degree: Clemson University, Clemson SC(w/Honors); BS in Microbiology

Medical Degree: Medical University of South Carolina, Charleston, SC

Residency: University of South Carolina School of Medicine, Columbia, SC

GI Fellowship: University of South Carolina School of Medicine, Columbia, SC

Board Certifications: Gastroenterology & Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; Lexington Medical Association; American Medical Association

Noteworthy: Board of Trustees at Lexington Medical Center; Past Chief of Medical Staff at Lexington Medical Center

Medical Status: Retired (effective 7/1/11)

S. Gabe Saleeby, MD, Retired

I am committed to advancing clinical quality objectives in medicine and serving as a patient advocate to protect and strengthen important Medicare benefits, such as improving awareness and coverage for preventative screenings.

Hometown: Hartsville, SC

Undergraduate Degree: University of South Carolina, Columbia SC, Magna Cum Laude with BS in Biology

Medical Degree: University of South Carolina, Columbia SC, Cum Laude in Medicine

Residency: University of South Carolina, Columbia SC

GI Fellowship: University of South Carolina, Columbia SC

Board Certifications: Gastroenterology & Internal Medicine

Membership: SC Gastroenterology Association; SC Medical Association; Lexington Medical Association; American College of Physicians; American College of Gastroenterology

Noteworthy: Chairman of Clinical Quality Assurance Committee at Carolina Care Plan; SC Gastroenterology Representative on the Medicare Medical Advisory Committee

Hospital Affiliations: Lexington Medical Center, MUSC Health Columbia

Mallory Anderson, MSN, FNP-BC

Hometown: Walterboro, SC

Undergraduate Degree: Bachelor of Science in Nursing, University of South Carolina, Columbia, South Carolina, Magna Cum Laude

Masters: Masters of Science in Nursing, University of South Carolina, Columbia, South Carolina

Board Certifications: South Carolina Board of Nursing, American Nurses Credentialing Center (ANCC) Certified Family Nurse Practitioner

Membership: American College of Gastroenterology, South Carolina Gastroenterology Association, Gastroenterology and Hepatology Advanced Practice Providers, American Nurses Association, American Association of Nurse Practitioners, American Gastroenterology Association

Noteworthy: South Carolina Gastroenterology Association Program Committee Advanced Practice Provider Representative, American College of Gastroenterology Advanced Practice Provider Committee Member

Hospital Affiliations: Lexington Medical Center

Amanda W. Charlton, MSN, APRN, NP-C

Hometown: Columbia, SC

Undergraduate Degree: Bachelor of Science in Nursing, University of South Carolina, Columbia, South Carolina; Bachelor of Science in Biological Sciences, Mississippi State University, Mississippi State, MS

Masters: Masters of Science in Nursing, University of South Carolina, Columbia, South Carolina

Board Certifications: South Carolina Board of Nursing, American Nurses Credentialing Center (ANCC) Certified Family Nurse Practitioner

Membership: American College of Gastroenterology, South Carolina Gastroenterology Association, Crohn’s and Colitis Foundation, Gastroenterology and Hepatology Advanced Practice Providers, American Nurses Association, American Association of Nurse Practitioners, American Gastroenterology Association

Noteworthy: American College of Gastroenterology Advanced Practice Provider Committee Member, Adjunct Instructor in the College of Nursing at the University of South Carolina, Mayo Clinic Inflammatory Bowel Disease Advanced Practice Provider Preceptorship

Hospital Affiliations: Lexington Medical Center

Merritt Stevenson, MSN, FNP-BC

Hometown: Columbia, SC

Undergraduate Degree: Bachelor of Science in Nursing, University of South Carolina, Columbia, South Carolina; Bachelor of Arts in English, University of South Carolina, Columbia, SC

Masters: Masters of Science in Nursing, University of South Carolina, Columbia, South Carolina

Board Certifications: South Carolina Board of Nursing, American Nurses Credentialing Center (ANCC) Certified Family Nurse Practitioner

Membership: American College of Gastroenterology, American Association of Nurse Practitioners

Hospital Affiliations: Lexington Medical Center

Caleb Weathersby, MSN, NP-BC

Hometown: Columbia, SC

Undergraduate Degree: Bachelor of Science in Nursing, University of South Carolina in Columbia, South Carolina; Columbia International University and Westminster Theological Seminary

Masters: Masters of Nursing, Catholic University of America

Board Certifications: South Carolina Board of Nursing, American Academy of Nurse Practitioners Certified Family Nurse Practitioner

Membership: American Association of Nurse Practitioners

Noteworthy: Adjunct Instructor in the College of Nursing at the University of South Carolina

Hospital Affiliations: Lexington Medical Center

Tina Jordan, MSN, NP-BC

Hometown: Lexington, SC

Undergraduate Degree: Bachelor of Science in Nursing, University of South Carolina in Columbia, South Carolina; Associate Degree in Health Science, Piedmont Technical College, Columbia, South Carolina

Masters: Masters in Science in Nursing, Walden University

Board Certifications: South Carolina Board of Nursing, American Academy of Nurse Practitioners Certified Family Nurse Practitioner

Membership: American Association of Nurse Practitioners

Hospital Affiliations: Lexington Medical Center

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