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Big Sky Oncology

Q: What type of organization is Big Sky Oncology?

Big Sky Oncology is registered in NPPES as a Hematology & Oncology Physician (its primary provider taxonomy).

Hematology & Oncology Physician in Great Falls, MT · enumerated 2006 · authorized official Grant Harrer, Preisdent.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1083793244

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Registry record

Entity type Organization (Type 2)

Legal business name Big Sky Oncology

Practice address 1117 29th St S, Suite 500, Great Falls, MT, 59405

Phone (406) 731-8100

Fax (406) 731-8135

Enumeration date Nov 6, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 5278 (MT) Primary

Authorized official

Name Grant Harrer

Title Preisdent

Phone (406) 731-8100

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Big Sky Oncology?

Big Sky Oncology is registered in NPPES as a Hematology & Oncology Physician (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.