5
1 Rating

Overview based on verified provider data
![]() | ![]() | ![]() | ![]() |
| Dr. Mark Edmund Johnston, MD | Dr. Sao Jang Liu, MD | Dr. Jessica Liloong Liu | Dr. Ronald Robert Krueger, MD |
| Ophthalmology | Ophthalmology | Ophthalmology | Ophthalmology |
| Accepts New Patients | Accepts New Patients | Accepts New Patients | |
| 46 Years of Experience | 45 Years of Experience | 9 Years of Experience | 39 Years of Experience |
| No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option |
| Speaks English, Spanish | Speaks Chinese, English, Spanish | Speaks English | Speaks Chinese, Spanish |
| Omaha , NE | Omaha , NE | Omaha , NE | Omaha , NE |
| Med School: Dalhousie Univ Fac Of Med | Med School: University Of Puerto Rico School Of Medicine | Med School: St Louis University School Of Medicine | Med School: Rutgers New Jersey Medical School |
Current Profile | View Profile | View Profile | View Profile |
Dr. Mark Edmund Johnston holds active and expired medical licenses in the states of Iowa and Nebraska.
Medical Doctor with an active medical license in the state of Iowa that expires in 2027 and an expired medical license in the state of Nebraska that expired in 2026.
Completed their residency at Dalhousie University.
Graduated from Dalhousie Univ Fac Of Med in 1980.
Dr. Johnston's NPI number is 1851398168.










This provider profile is built using data from:
Our provider data is gathered directly from physicians and publicly available databases. Providers who verify their profiles gain the ability to update information, offering additional details about their specialties,education, treated conditions, performed procedures, and accepted insurances.
Reviews on Vitals are submitted by users only. Recognizing the valuable insights these reviews offer into a doctor's reputation, we maintain internal policies and protocols to ensure the quality and accuracy of all reviews. Importantly, providers cannot delete or alter reviews independently. Reviews can only be deleted or changed following an internal assessment by our customer service team.
Your feedback is highly valued and we encourage you to contact our support team should you encounter any issues.