At Texas Gulf Coast Medical Systems (TGC)

Doctors of internal medicine, or internist, care for disorders in the internal organs of adolescent and adult patients. Similar to a family medicine physician, your internist manages your whole health. Your internist can serve as your primary care provider, committed to a long-term relationship or as a consultant to other medical specialists to coordinate a treatment plan.

Our internists specialize in:

  • The prevention, diagnosis and (nonsurgical) treatment of adult diseases
  • Health management of patients with serious and/or unusual diseases

Doctors of Internal Medicine provide:

  • Histories and physicals
  • Interpretations of diagnostic studies, lab tests, x- rays, and rehab services
  • Treatments for common illnesses, as well as chronic diseases and minor injuries
  • Prescription medication and treatments extending to nonpharmacological therapies
  • Consultation
  • Education
  • Counseling
  • Diagnoses

In additions to treating diseases, our internist is also trained in the essentials of primary care, which incorporates an understanding of:

  • Disease prevention
  • Wellness
  • Substance abuse
  • Mental health

Effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs

Department Doctors

Dr. Dennis Tang

Dr. Dennis Tang earned his medical degree from the University of Texas Medical School – Houston. He completed his internal medicine residency at the University of Texas Medical Branch, Galveston where he also worked in the emergency room. Dr. Tang is bo

Dr. John Turner

Dr. John Turner is a seventh generation Texan. He has also lived in Oklahoma, and graduated from the University of Oklahoma with a Bachelor of Science in Microbiology. He then earned his Medical Doctorate from the University of Oklahoma College of Medicin

Dr. Richard Marietta

Dr. Richard Marietta joined our team on April 1, 2016. Dr. Marietta has practiced in the Clear Lake area since 1978. He most recently served at Clear Lake Regional Medical Center as the Chief Medical Officer. Dr. Marietta received a Bachelor of Arts from

Dr. David Michael Washington

Dr. Washington, double board-certified in Internal Medicine and Pediatrics, joined our team late July 2017.  Dr. Washington completed his residency in Internal Medicine and Pediatrics at Rhode Island Hospital and received his Medical Degree from The Warr

Dr. Candice Dunn

Dr. Dunn was born and raised in League City and wants to raise her family and practice medicine in the area she grew up in. Dr. Dunn is board-certified in Internal Medicine. She completed her residency program at the University of Texas Medical Branch at

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