Big Sky Internal Medicine
NPI 1023100732 · Internal Medicine Physician · Lewistown, MT
Big Sky Internal Medicine is a Internal Medicine Physician organization in Lewistown, MT (NPI 1023100732).
Provider details
- NPI number
- 1023100732
- Entity type
- Organization
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Janet Grensten, Office Manager(406) 535-1490
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
Mailing address
Registry dates
- Enumerated
- 2006-09-29
- Last updated
- 2009-10-20
Frequently asked questions
- What is Big Sky Internal Medicine's NPI number?
- Big Sky Internal Medicine's National Provider Identifier (NPI) is 1023100732, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Big Sky Internal Medicine?
- Big Sky Internal Medicine is classified in the NPPES registry as Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Big Sky Internal Medicine located?
- Big Sky Internal Medicine's practice location on file with NPPES is 310 Wendell Ave Ste 101, Lewistown, MT 59457-2267.
- What is Big Sky Internal Medicine's phone number?
- The practice phone number listed in the NPPES registry for Big Sky Internal Medicine is (406) 535-1490.
- Who is the authorized official for Big Sky Internal Medicine?
- The authorized official listed on Big Sky Internal Medicine's NPPES record is Janet Grensten, Office Manager. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Big Sky Internal Medicine's NPI active?
- Yes — Big Sky Internal Medicine's NPI (1023100732) is active in the NPPES registry as of the last update on 2009-10-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.