Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Howard Nicholson, MD

Individual provider Psychiatry Physician · NPI 1235126566

Dr. Mark Howard Nicholson, MD is a Psychiatry Physician in Billings, Montana. Practices as a sole proprietor. Licensed in Montana.

Licensed in
MT
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1018 N 30th St
Billings, MT 59101-0732
Phone: (406) 245-1559
Fax: (406) 564-1313
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 7623 (MT)

Record details

NPI number1235126566
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 3, 2005
Last updated in NPPESFebruary 22, 2016

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