IndividualActive
Mark Nicholson, MD
NPI 1235126566 · Psychiatry Physician · Billings, MT
Mark Nicholson, MD is a Psychiatry Physician provider in Billings, MT (NPI 1235126566).
Provider details
- NPI number
- 1235126566
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 7623 (MT)
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
1018 N 30th St
Billings, MT 59101-0732
Phone: (406) 245-1559
Fax: (406) 564-1313
Street-level locationGet directions
Mailing address
Po Box 2315
Billings, MT 59103-2315
Registry dates
- Enumerated
- 2005-10-03
- Last updated
- 2016-02-22
Frequently asked questions
- What is Mark Nicholson's NPI number?
- Mark Nicholson's National Provider Identifier (NPI) is 1235126566, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nicholson's specialty?
- Mark Nicholson is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nicholson located?
- Mark Nicholson's practice location on file with NPPES is 1018 N 30th St, Billings, MT 59101-0732.
- What is Mark Nicholson's phone number?
- The practice phone number listed in the NPPES registry for Mark Nicholson is (406) 245-1559.
- Is Mark Nicholson's NPI active?
- Yes — Mark Nicholson's NPI (1235126566) is active in the NPPES registry as of the last update on 2016-02-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.