NPI 1013923127

Mark C Johnson, MD

Practitioner Internal Medicine Physician Mason City, IA

Practice location

Address: 910 N Eisenhower Ave, Mason City, IA 50401-2800
Phone: (641) 428-7799
Fax: (641) 428-5274
Mailing address: 621 S Illinois Ave Suite 103, Mason City, IA 50401-5489

Registered specialties

Internal Medicine Physician Primary

Allopathic & Osteopathic Physicians Taxonomy 207R00000X Licence 21527 (IA)

Other Internal Medicine providers in Iowa →

Registry record

NPI: 1013923127
Entity type: Individual
Sex (as registered): Male
NPI issued: 31 Jul 2006
Record last updated: 8 Jul 2025

Reproduced from NPPES, the federal provider registry. The date above is when the provider last updated their own entry, not when we fetched it - a record can be years old and still current in the registry.