Mark Eldon Johnston, FNP-C
- Affiliated sites
- 1
- Medical group
- 1
- State licenses
- 2
- Year NPI issued
- 2014
- Practice locations
- 2
- Practice address
- 7098 Lockwood Blvd, Youngstown, OH 44512
- Practice phone
- Call (330) 953-1858
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Jason A Hollabaugh,dc LLC
Multi-specialty group site · Youngstown, Ohio
Find Mark Johnston's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Mark Eldon Johnston is a family nurse practitioner in Cleveland, Ohio
Mark Johnston practices at Jason A Hollabaugh,dc LLC in Youngstown, Ohio.
Mark Johnston's NPI, 1144623455, was assigned on September 30, 2014. Mark Johnston holds Florida license APRN9462949.
- NPI
- 1144623455NPI Registry (opens in a new tab)
- NPI enumeration date
- September 30, 2014
- NPI status
- Active
- Practice phone
- (330) 953-1858
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 38
- Medical school graduation
- 2014
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Mark Eldon Johnston practices in Youngstown and Cleveland
Mark Johnston's primary practice is Jason A Hollabaugh,dc LLC, at 7098 Lockwood Blvd, Youngstown, OH 44512. The practice phone is (330) 953-1858. The NPI Registry lists Mark Johnston's practice address as 9500 Euclid Ave, Cleveland, OH 44106.
- Jason A Hollabaugh,dc LLCPrimary7098 Lockwood Blvd, Youngstown, OH 44512Phone(330) 953-1858
- NPI Registry address9500 Euclid Ave, Cleveland, OH 44106 · Cuyahoga CountyPhone(352) 726-1551
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Mark Eldon Johnston is affiliated with 1 site of care and 1 medical group
Mark Johnston's primary practice is Jason A Hollabaugh,dc LLC in Youngstown, Ohio. Dmand AI also links Mark Johnston to 1 medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Mark Eldon Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mark Johnston practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Jason A Hollabaugh,dc LLC | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Mark Eldon Johnston is one of 7,779 family nurse practitioners in Ohio
Family is Mark Johnston's primary specialty in the NPI Registry, under taxonomy code 363LF0000X. Dmand AI has Mark Johnston's licenses on file in 2 states: Florida and Texas.
Specialties and state licenses
- Family nurse practitioner, FloridaPrimary
- Administrator registered nurse, Texas
Family nurse practitioners near Mark Johnston
Counts of family nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Mark Eldon Johnston's patients have a median age of 55
Across all payers, Dmand AI patient panel data puts Mark Johnston's median patient age at 55, with 0% women.
Mark Johnston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 55
Patient panel by sex, all payers
- Women0%
- Men100%
Source: Dmand AI Patient Panel Data
Sources for Mark Eldon Johnston's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Mark Eldon Johnston
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mark Eldon Johnston's NPI number?
Mark Eldon Johnston's NPI number is 1144623455. It was assigned on September 30, 2014, and it is active in the NPI Registry.
What does Mark Eldon Johnston specialize in?
Mark Eldon Johnston is a family nurse practitioner in Cleveland, Ohio. The primary specialty in the NPI Registry is Family Nurse Practitioner (taxonomy code 363LF0000X).
Where does Mark Eldon Johnston practice?
Mark Johnston practices at 7098 Lockwood Blvd, Youngstown, OH 44512. Mark Johnston also practices at 9500 Euclid Ave, Cleveland, OH 44106. Mark Johnston's primary practice is Jason A Hollabaugh,dc LLC in Youngstown, Ohio. Dmand AI also links Mark Johnston to 1 medical group.
What is Mark Eldon Johnston's office phone number?
The practice phone on file for Mark Johnston is (330) 953-1858.
What is Mark Eldon Johnston's medical license number?
Mark Johnston holds Florida license APRN9462949, one of the licenses on file in 2 states.
Which states has Mark Eldon Johnston been licensed in?
Dmand AI has state licenses on file for Mark Johnston in Florida and Texas.
How long has Mark Eldon Johnston been practicing?
Mark Johnston graduated from medical school in 2014, 12 years ago.
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