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Dr. Mark A. Johnston, MD

Internal Medicine

  • (214) 361-5432

Dr. Johnston's Overview

Dr. Mark A. Johnston graduated from the University of Texas Southwestern Medical Center at Dallas in 1984. He works in Dallas, TX and specializes in Internal Medicine and Public Health & General Preventive Medicine. Dr. Johnston is affiliated with Texas Health Presbyterian Hospital Dallas, USMD Hospital At Arlington and USMD Hospital At Fort Worth.

Dr. Johnston's Experience

Years in Practice: 31

Dr. Johnston's Specialties

Internal Medicine, Public Health & General Preventive Medicine

Dr. Johnston's Education & Training

Medical School: University of Texas Southwestern Medical Center at Dallas; Graduated 1984

Dr. Johnston's Rating

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Overall Rating


  • Explains conditions & treatments
  • Takes time to answer my questions
  • Provides follow-up as needed
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Dr. Johnston's Accepted Insurance

  • Aetna Choice POS II
  • Aetna HMO
  • Aetna Managed Choice POS Open Access
  • Aetna Signature Administrators PPO
  • BCBS Blue Card PPO
  • BCBS TX BlueChoice
  • CIGNA LocalPlus
  • CIGNA Open Access Plus
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Dr. Johnston's Office Information & Appointments

Office Locations

Medical Clinic North Texas
Medical Clinic Of North Texas

7515 Greenville Ave Ste 600
Dallas, TX 75231
(214) 361-5432


Office Hours and Information

Fax: (214) 363-8710

Practice Website:

Accepting New Patients: Yes

Medicare Accepted: Yes

Medicaid Accepted: No

Monday 8:00 AM - 5:00 PM
Tuesday 8:00 AM - 5:00 PM
Wednesday 8:00 AM - 5:00 PM
Thursday 8:00 AM - 5:00 PM
Friday 8:00 AM - 5:00 PM
Saturday Closed
Sunday Closed

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