Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John R Dorr, M.D.

Q: What is the NPI number for John Dorr?

The National Provider Identifier (NPI) for John Dorr is 1750388609, a Type 1 (individual) record in the CMS NPPES registry.

Orthopaedic Surgery Physician in Billings, MT · enumerated 2005.

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

National Provider Identifier

1750388609

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. John R Dorr

Credential M.D.

Sex Male

Practice address 2900 12th Ave N, #140 W, Billings, MT, 59101

Phone (406) 237-5050

Fax (406) 238-6599

Enumeration date Jul 7, 2005

Last updated in NPPES Jan 4, 2011

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 3898 (MT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
0016900	Medicaid	MT	-

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

Where does John Dorr practice?

The practice location on file with NPPES is in Billings, MT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for John Dorr?

The National Provider Identifier (NPI) for John Dorr is 1750388609, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-01-04.