Dr. Mark Christopher Johnson, MD
- Medicare services, 2024
- 5,519
- Medicare patients, 2024
- 4,073
- Part D claims, 2024
- 43
- Hospital affiliations
- 6
- Industry payments
- $252
- Practice address
- 1111 6th Avenue, 4th Floor Main, Des Moines, IA 50314
- Practice phone
- Call (515) 247-4400
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Johnson's professional email, personal email and mobile number
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Dr. Mark Christopher Johnson is a diagnostic radiologist in Des Moines, Iowa
Dr. Johnson practices at Select Specialty Hospital - Des Moines in Des Moines, Iowa, part of Select Medical Holdings.
Dr. Johnson's NPI, 1053439059, was assigned on March 27, 2007. Dr. Johnson graduated from University of Iowa, RJ & L Carver College of Medicine in 2005. Dr. Johnson holds Iowa license 39397.
- NPI
- 1053439059NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0244426807
- NPI enumeration date
- March 27, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (515) 247-4400
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Christopher Johnson practices at Select Specialty Hospital - Des Moines in Des Moines, Iowa
Dr. Johnson's primary practice is Select Specialty Hospital - Des Moines, at 1111 6th Avenue, 4th Floor Main, Des Moines, IA 50314 in Polk County. The practice phone is (515) 247-4400.
- Select Specialty Hospital - Des Moines1111 6th Avenue, 4th Floor Main, Des Moines, IA 50314 · Polk CountyPhone(515) 247-4400
Source: Dmand AI Affiliation Data
Dr. Mark Christopher Johnson is affiliated with 6 sites of care and 2 medical groups
Dr. Johnson's primary practice is Select Specialty Hospital - Des Moines in Des Moines, Iowa, part of Select Medical Holdings. Dr. Johnson is also affiliated with MercyOne Des Moines Medical Center. The medical group on file is MercyOne Iowa Heart Center. Dmand AI also links Dr. Johnson to 4 more hospitals and 1 medical group, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Christopher Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Select Specialty Hospital - Des Moines | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark Christopher Johnson is one of 299 diagnostic radiologists in Iowa
Diagnostic radiology is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 2085R0202X. Dr. Johnson is licensed in Iowa.
Specialties and state licenses
- Diagnostic radiology, IowaPrimary
Diagnostic radiologists near Dr. Johnson
Counts of diagnostic radiologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Mark Christopher Johnson billed Medicare for 5,519 services in 2024
CMS data shows 5,519 Medicare services from Dr. Johnson across 58 procedure codes in 2024, for 4,073 Medicare patients. Medicare paid $97,720 for them.
Dr. Johnson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 5,4102024: 5,4711%
- Tests and treatments
- 2023: 422024: 4814%
Where Dr. Johnson's Medicare services took place, 2024
- In an office64712%
- In a facility4,87288%
Dr. Johnson compared with the Iowa median for diagnostic radiologists, 2024
- Dr. Johnson
- Iowa median
- Medicare services
- 5,519vs 3,02782% above
- Medicare patients
- 4,073vs 2,33674% above
- Part D claims
- 11vs 1631% below
Medians across 293 diagnostic radiologists in Iowa with Dmand AI profiles that report each measure.
Dr. Johnson's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Christopher Johnson treated 4,073 Medicare patients in 2024, average age 75
CMS counts 4,073 Medicare patients who saw Dr. Johnson in 2024. The largest group is 65 to 74, with 1,742 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 10% are also on Medicaid. Their average risk score is 1.37, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnson's median patient age at 58, with 57% women.
Dr. Johnson's Medicare patients by age, 2024
Dr. Johnson's Medicare patients by sex, 2024
- Women2,47261%
- Men1,60139%
Chronic conditions among Dr. Johnson's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Diabetes30%
- Ischemic heart disease29%
- Mood disorders28%
- Chronic kidney disease27%
- Depression27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnson's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 58
Patient panel by sex, all payers
- Women57%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Christopher Johnson wrote 43 Medicare Part D claims in 2024
In 2024, Dr. Johnson wrote 43 Medicare Part D claims for 12 patients. 72% of them were for generic drugs. CMS names the drug for 11 of them, across 1 drug with 11 or more claims each, at $617 in total drug cost. In 2020, CMS named 29 claims across 2 drugs.
Dr. Johnson's Part D claims by kind of drug, 2024
- Generic31 claims72%
- Brand-name and other12 claims28%
Dr. Johnson's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2022
- 2020
- 2022
- Claims for drugs CMS names
- 2020: 292022: 1162%
Drugs named by CMS: 1 in 2022, 2 in 2020.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Mark Christopher Johnson takes part in Medicare
Dr. Johnson accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark Christopher Johnson received $252 in industry payments from 2016 to 2021
CMS Open Payments shows 11 general payments to Dr. Johnson from 6 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 100% of the total. Medtronic MiniMed, Inc. paid the most, $99.
General payments to Dr. Johnson by program year, 2016 to 2021
Companies that paid Dr. Johnson the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Christopher Johnson graduated from University of Iowa, RJ & L Carver College of Medicine
Dr. Johnson graduated from University of Iowa, RJ & L Carver College of Medicine in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Christopher Johnson's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Mark Christopher Johnson
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Mark Christopher Johnson's NPI number?
Dr. Mark Christopher Johnson's NPI number is 1053439059. It was assigned on March 27, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Christopher Johnson?
Dr. Mark Christopher Johnson is a diagnostic radiologist in Des Moines, Iowa. The primary specialty in the NPI Registry is Diagnostic Radiology Physician (taxonomy code 2085R0202X).
Where does Dr. Mark Christopher Johnson practice?
Dr. Johnson practices at 1111 6th Avenue, 4th Floor Main, Des Moines, IA 50314. Dr. Johnson's primary practice is Select Specialty Hospital - Des Moines in Des Moines, Iowa, part of Select Medical Holdings. Dmand AI also links Dr. Johnson to 4 hospitals and 1 medical group.
What is Dr. Mark Christopher Johnson's office phone number?
The practice phone on file for Dr. Johnson is (515) 247-4400.
What is Dr. Mark Christopher Johnson's medical license number?
Dr. Johnson holds Iowa license 39397.
Which hospitals is Dr. Mark Christopher Johnson affiliated with?
Dr. Johnson practices at Select Specialty Hospital - Des Moines in Des Moines, Iowa. Dr. Johnson is also affiliated with MercyOne Des Moines Medical Center. Dmand AI links Dr. Johnson to 4 more hospitals.
What medical group is Dr. Mark Christopher Johnson part of?
Dr. Johnson is linked to MercyOne Iowa Heart Center. Dmand AI links Dr. Johnson to 1 more medical group.
Does Dr. Mark Christopher Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 5,519 services in 2024, and Dr. Johnson accepts Medicare assignment.
How many Medicare patients does Dr. Mark Christopher Johnson see?
CMS counts 4,073 Medicare patients who saw Dr. Johnson in 2024, with an average age of 75.
What services does Dr. Mark Christopher Johnson bill to Medicare?
In 2024, Dr. Johnson's most billed Medicare services were diagnostic imaging (71046), diagnostic imaging (71045) and radiation oncology (77080).
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Where did Dr. Mark Christopher Johnson go to medical school?
Dr. Johnson graduated from University of Iowa, RJ & L Carver College of Medicine in 2005.
What drugs does Dr. Mark Christopher Johnson prescribe most?
In 2022 Medicare Part D data, Dr. Johnson's most prescribed drugs by claims were Nano 2nd Gen Pen Needle.
Has Dr. Mark Christopher Johnson received payments from drug or device companies?
CMS Open Payments shows $252 in general payments to Dr. Johnson from 6 companies from 2016 to 2021. The largest total came from Medtronic MiniMed, Inc.
How long has Dr. Mark Christopher Johnson been practicing?
Dr. Johnson graduated from medical school in 2005, 21 years ago.
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