MARK C JOHNSON (MD) – Internal Medicine Physician, NPI 1013923127
Internal Medicine Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
74 ENDOCRINOLOGY in IA
Loading map...
Provider Addresses for MARK C JOHNSON (MD)
Mercy Family Clinic - Regency, 621, South Illinois Avenue, Regency, Mason City, Cerro Gordo County, Iowa, 50401, United States
SUITE 103
MASON CITY, IA 504015489
Phone: (641) 428-3041
Fax: (641) 428-3059
Type: Mailing
North Iowa Mercy Health Center - West Campus, 910, North Eisenhower Avenue, Mason City, Cerro Gordo County, Iowa, 50401, United States
MASON CITY, IA 504012800
Phone: (641) 428-7799
Fax: (641) 428-5274
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
CMS reports 81 Open Payments records for all available years, with a total value of $27,271.
Total Amount is formed as General ($27,271) + Research ($0) + Ownership ($0) = $27,271.
Last reported payment date: 2024-12-16 • Largest payer in this snapshot: Novo Nordisk Inc ($12,867).
Total Amount
$27,271
General + Research + Ownership
Payments
81
Total payment records
General Amount
$27,271
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-16
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Novo Nordisk Inc | $12,867 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $7,027 |
| Lilly USA, LLC | $5,925 |
| Medtronic, Inc. | $1,141 |
| Abbott Laboratories | $163 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2006-09-08
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060908000162 | I | Endocrinology | IA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 1,467 | 1,093 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 1,220 | 513 | $0 |
| 95251 | Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report | 365 | 154 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 239 | 113 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 14 | 14 | $0 |
Insurance plans in this area (ZIP 50401)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| P S Y C H I A T R Y | IA | |
| Physician Assistant | TN | |
| - | IA | |
| - | PA | |
| Cardiovascular Disease (Cardiology), Critical Care (Intensivists) | IA | |
| Certified Registered Nurse Anesthetist (Crna) | IA | |
| Physician Assistant | IA | |
| - | IA | |
| Sleep Medicine | IA | |
| Nurse Practitioner | IA |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.