# Mark C Johnson, MD

Source: https://ourhealthnetwork.com/doctor/mark-johnson-md-1013923127
NPI: 1013923127
Data source: CMS NPI Registry (DAC), refreshed monthly

## Quick facts

Mark C Johnson, MD is a endocrinology based in Mason City, IA practicing at North Iowa Mercy Clinics with NPI 1013923127.

## Profile

- Primary specialty: Endocrinology
- Secondary specialties: INTERNAL MEDICINE
- Credential: MD
- Gender: Male
- Medical school: UNIVERSITY OF IOWA, RJ & L CARVER COLLEGE OF MEDICINE
- Graduation year: 1977
- NPI: 1013923127 ([NPPES record](https://npiregistry.cms.hhs.gov/provider-view/1013923127))

## Practice and contact

- Practice name: North Iowa Mercy Clinics
- Address: 910 N Eisenhower Ave, Mercyone Diabetes Care, Mason City, IA, 504011525
- Phone: (641) 428-7799
- Group practice size: 314 members

## Insurance accepted (8 networks)

This provider is in network with the following insurance carriers, based on federal Transparency in Coverage filings and FHIR provider directories:

- [Cigna](https://ourhealthnetwork.com/insurance/cigna) — 17 plans
- [Highmark BCBS Delaware](https://ourhealthnetwork.com/insurance/highmark-bcbs-delaware) — 11 plans
- [Highmark BCBS WV](https://ourhealthnetwork.com/insurance/highmark-bcbs-wv) — 6 plans
- [Aetna](https://ourhealthnetwork.com/insurance/aetna) — 4 plans
- [Wellmark BCBS Iowa](https://ourhealthnetwork.com/insurance/wellmark-bcbs-iowa) — 2 plans
- [Medicare](https://ourhealthnetwork.com/insurance/medicare) — 1 plan
- [UMR](https://ourhealthnetwork.com/insurance/umr) — 1 plan
- [UnitedHealthcare](https://ourhealthnetwork.com/insurance/unitedhealthcare) — 1 plan

To verify a specific plan covers Mark C Johnson, use the [OurHealthNetwork Insurance Matcher](https://ourhealthnetwork.com/tools/insurance-matcher?npis=1013923127).

## Industry payments disclosure (CMS Open Payments)

Per CMS Open Payments data (most recent year 2024), this provider has received 47 disclosed payments from medical industry sources totaling approximately $16,974.

Largest disclosed payer: Novo Nordisk Inc ($6,085 cumulative).

Source: CMS Open Payments program (federal financial-transparency dataset). Industry payment disclosures do not imply any wrongdoing; many are legitimate consulting fees, research support, or speaker honoraria.

## Related on OurHealthNetwork

- [More Endocrinology doctors in MASON CITY, IA](https://ourhealthnetwork.com/endocrinology/ia/mason-city)
- [Find insurance plans that cover this doctor](https://ourhealthnetwork.com/tools/insurance-matcher?npis=1013923127)
- [Browse all 5.5M US healthcare providers](https://ourhealthnetwork.com/find-doctors)
- [About our data and methodology](https://ourhealthnetwork.com/methodology)