Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Mark Edmund Johnston, MD FRCSC

Ophthalmology Physician in Omaha, NE · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1851398168

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Edmund Johnston

Credential MD FRCSC

Sex Male

Practice address Omaha, NE, 68122

Phone (402) 639-3250

Fax (402) 387-7967

Enumeration date Jun 30, 2005

Last updated in NPPES Mar 6, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 31743 (IA) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 20412 (NE) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Mark Johnston?

The National Provider Identifier (NPI) for Mark Johnston is 1851398168, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Johnston practice?

The practice location on file with NPPES is in Omaha, NE. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-06.