MARK C JOHNSON MD
NPI 1013923127
Internal Medicine in Mason City, IA
About Mark C Johnson Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK C JOHNSON MD (NPI 1013923127) is an individual internal medicine provider in Mason City, Iowa, licensed in Iowa (21527) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Mercyone North Iowa Medical Center, and is a graduate of University Of Iowa, Rj & L Carver College Of Medicine (1977).
NPPES Registry Identity
Specialties & Licenses
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Mark C Johnson Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 6
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mercyone North Iowa Medical Center
Acute Care Hospitals · Mason City, IAHancock County Health System
Critical Access Hospitals · Britt, IAFranklin General Hospital
Critical Access Hospitals · Hampton, IAFloyd County Medical Center
Critical Access Hospitals · Charles City, IAKossuth Regional Health Center
Critical Access Hospitals · Algona, IAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 50401 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims 12
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MASON CITY, IA 50401
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mark Johnson's NPI number?
The NPI number for Mark Johnson is 1013923127. It was assigned to this individual provider in the NPPES registry on July 31, 2006.
Where is Mark Johnson located?
Mark Johnson practices at 910 N Eisenhower Ave, Mason City, IA 50401. The listed phone number is (641) 428-7799.
What is Mark Johnson's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Mark Johnson enrolled in Medicare?
Yes. Mark Johnson is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does Mark Johnson accept?
Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from Home State Health, Ambetter from NH Healthy Families and Ambetter from Sunflower Health Plan and 1 other insurer list Mark Johnson as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Mark Johnson affiliated with any hospitals?
According to CMS data, Mark Johnson is affiliated with Mercyone North Iowa Medical Center, Hancock County Health System, Franklin General Hospital, Floyd County Medical Center and Kossuth Regional Health Center.
When was this NPI record last updated?
The NPPES record for Mark Johnson was last updated on July 8, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.
