Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Robert J Johnston, M.D.

Diagnostic Radiology Physician in Denver, CO · enumerated 2006.

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

National Provider Identifier

1225049000

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Robert J Johnston

Credential M.D.

Sex Male

Practice address Denver, CO, 80204

Phone (303) 914-8800

Fax (303) 716-3777

Enumeration date Aug 10, 2006

Last updated in NPPES Mar 5, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 29731 (CO) 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
01297316	Medicaid	CO	-

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 the NPI number for Robert Johnston?

The National Provider Identifier (NPI) for Robert Johnston is 1225049000, a Type 1 (individual) record in the CMS NPPES registry.

Where does Robert Johnston practice?

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

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-05.