Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mark H Johnson, PHD

Individual provider Clinical Psychologist · NPI 1932100518

Mark H Johnson, PHD is a Clinical Psychologist in Great Falls, Montana. Licensed in Montana. Registered with an NPI since 2005.

Licensed in
MT
In the registry since
2005
Specialties on file
2
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

400 15th Ave S Ste 205
Great Falls, MT 59405-4375
Phone: (406) 731-8888
Fax: (406) 731-8876
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Neuropsychologist (primary) Taxonomy 103G00000X · Licence 198 (MT)
Clinical Psychologist Taxonomy 103TC0700X · Licence 198 (MT)

Record details

NPI number1932100518
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedAugust 9, 2005
Last updated in NPPESApril 8, 2024
Certification dateApril 8, 2024

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients33
Services billed 169 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

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