Internal Medicine · Mason City, IA
NPI
1013923127
Since 2006
Specialty
Internal Medicine
Code 207R00000X
Group practices
1
Medicare group memberships
Hospitals
5
Hospital affiliations
910 N Eisenhower Ave
Mason City, IA, 50401
Phone (641) 428-7799
Groups this clinician bills Medicare through
Medicare paid, 2024
$106K
3,877 services
Medicare patients, 2024
1,561
Average age 77
Drug cost, 2024
$5.1M
10,023 prescriptions
Company payments, 2025
$28K
From 7 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Mark C Johnson was code 93010 (electrocardiogram), 1,381 times for 1,050 patients. In total Mark C Johnson billed 3,877 services in 12 codes, and Medicare paid $106K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2025-07-08.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 93010 Electrocardiogram | Facility | 1,381 | 1,050 | $5.73 | $7,907 |
| 99214 Office E&M - Established | Facility | 987 | 467 | $64.29 | $63K |
| G2211 Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's | Facility | 828 | 445 | $11.70 | $9,685 |
| 95251 Test - Miscellaneous | Facility | 379 | 184 | $24.31 | $9,213 |
| 99232 Hospital E&M - Subsequent | Facility | 244 | 100 | $55.79 | $14K |
| 99214 Office E&M - Established | Office | 17 | 11 | $29.59 | $503 |
| 99213 Office E&M - Established | Facility | 13 | 12 | $40.94 | $532 |
By year: 2022 $106K for 2,997 services; 2023 $112K for 3,334 services; 2024 $106K for 3,877 services.
Medicare prescription drug claims, 2024
In 2024, the drug Mark C Johnson prescribed most often to Medicare patients was Ozempic (Semaglutide), with 1,205 prescriptions and refills. In total Mark C Johnson wrote 10,023 Medicare prescriptions that cost $5.1M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Ozempic Semaglutide | 1,205 | 1,452 | 170 | $1.3M |
| Jardiance Empagliflozin | 749 | 1,116 | 125 | $625K |
| Novolog Flexpen Insulin Aspart | 492 | 775 | 130 | $106K |
| Soliqua 100-33 Insulin Glargine/Lixisenatide | 475 | 678 | 68 | $435K |
| Trulicity Dulaglutide | 381 | 461 | 54 | $441K |
| Synjardy Xr Empagliflozin/Metformin Hcl | 344 | 510 | 57 | $289K |
| Nano 2nd Gen Pen Needle Pen Needle, Diabetic | 321 | 630 | 100 | $24K |
| Farxiga Dapagliflozin Propanediol | 319 | 469 | 59 | $251K |
| Atorvastatin Calcium Generic | 319 | 819 | 100 | $2,742 |
| Lantus Solostar Insulin Glargine,hum.Rec.Anlog | 311 | 585 | 80 | $35K |
| Humalog Kwikpen U-100 Insulin Lispro | 269 | 429 | 68 | $72K |
| Metformin Hcl Er Metformin Hcl | 247 | 568 | 69 | $1,417 |
| Mounjaro Tirzepatide | 240 | 256 | 51 | $262K |
| Metformin Hcl Generic | 230 | 638 | 69 | $1,249 |
| Losartan Potassium Generic | 197 | 485 | 60 | $1,662 |
Brand drugs: 6,843 claims; generic drugs: 2,475 claims; opioid claims: 24.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Mark C Johnson $28K ($28K in general payments such as food, travel and fees) from 7 companies. The largest payer was Novo Nordisk Inc with $24K.
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.