Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Harold D Johnston, M.D.

Family Medicine Physician in Cook, MN · enumerated 2006.

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

National Provider Identifier

1255305942

Verified

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Registry record

Entity type Individual (Type 1)

Name Harold D Johnston

Credential M.D.

Sex Male

Practice address 20 5th St Se, Medical, Cook, MN, 55723

Phone (218) 666-5941

Fax (218) 666-5099

Enumeration date Feb 17, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 21520 (MN) 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
69391	Other	MN	MPIN
D75759	Other	MN	UPIN

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 Harold Johnston?

The National Provider Identifier (NPI) for Harold Johnston is 1255305942, a Type 1 (individual) record in the CMS NPPES registry.

Where does Harold Johnston practice?

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

Other providers at this practice address

Browse all →

Cook Area Health Services, Inc Clinic/Center · Cook, MN NPI 1538132774 Duane Sushoreba General Practice Dentistry · Cook, MN NPI 1689649386 Craig Mrosak General Practice Dentistry · Cook, MN NPI 1699740928 Joanne Intveld Internal Medicine Physician · Cook, MN NPI 1477528701 Cook Area Health Services, Inc Clinic/Center · Cook, MN NPI 1437124401 Timothy Sprouls Dentist · Cook, MN NPI 1538120712 Jeri Mills Obstetrics & Gynecology Physician · Cook, MN NPI 1235189200 Fred Webber Family Medicine Physician · Cook, MN NPI 1770508103

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.