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Mark Johnston, M.D.
NPI 1679516116 · Internal Medicine Physician · Dallas, TX
Mark Johnston, M.D. is a Internal Medicine Physician provider in Dallas, TX (NPI 1679516116).
Provider details
- NPI number
- 1679516116
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- H1380 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
7515 Greenville Ave
Suite 600
Dallas, TX 75231-3831
Phone: (214) 361-5432
Fax: (214) 363-8710
Street-level locationGet directions
Mailing address
7515 Greenville Ave
Dallas, TX 75231-3831
Registry dates
- Enumerated
- 2006-06-13
- Last updated
- 2013-07-02
Frequently asked questions
- What is Mark Johnston's NPI number?
- Mark Johnston's National Provider Identifier (NPI) is 1679516116, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Johnston's specialty?
- Mark Johnston is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Johnston located?
- Mark Johnston's practice location on file with NPPES is 7515 Greenville Ave, Dallas, TX 75231-3831.
- What is Mark Johnston's phone number?
- The practice phone number listed in the NPPES registry for Mark Johnston is (214) 361-5432.
- Is Mark Johnston's NPI active?
- Yes — Mark Johnston's NPI (1679516116) is active in the NPPES registry as of the last update on 2013-07-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.