Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregg Wendell Schellack, D.O.

Orthopaedic Surgery Physician in Livingston, MT · enumerated 2006.

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

National Provider Identifier

1205887544

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregg Wendell Schellack

Credential D.O.

Sex Male

Practice address 320 Alpenglow Ln, Livingston, MT, 59047

Phone (406) 222-3541

Fax (406) 222-7606

Enumeration date May 12, 2006

Last updated in NPPES Aug 21, 2024

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License PHYS-35111 (MT) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

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.

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Frequently asked questions

How do I verify Gregg Schellack's NPI record?

Cross-check NPI 1205887544 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1205887544 active?

Yes, as of the latest NPPES snapshot, NPI 1205887544 is active (record last updated 2024-08-21).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-21.