Dr. Mark S. Johnson, MD
- Medicare services, 2024
- 13
- Medicare patients, 2024
- 23
- Part D claims, 2024
- 108
- Hospital affiliations
- 1
- Industry payments
- $39,963
- Practice address
- 2139 Georgia NW Ave, Washington, DC 20001
- Practice phone
- Call (202) 595-3223
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Howard University
Washington, District of Columbia
Find Dr. Johnson's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Mark S. Johnson is a family medicine physician in Washington, District of Columbia
Dr. Johnson practices at Howard University in Washington, District of Columbia.
Dr. Johnson's NPI, 1659462190, was assigned on September 28, 2006. Dr. Johnson graduated from Rutgers New Jersey Medical School in 1979. Dr. Johnson holds New Jersey license 25MA05722100.
- NPI
- 1659462190NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2860677820
- NPI enumeration date
- September 28, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (202) 595-3223
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 73
- Medical school graduation
- 1979
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark S. Johnson practices at Howard University in Washington, District of Columbia
Dr. Johnson's primary practice is Howard University, at 2139 Georgia NW Ave, Washington, DC 20001 in District Of Columbia County. The practice phone is (202) 595-3223.
- Howard University2139 Georgia NW Ave, Washington, DC 20001 · District Of Columbia CountyPhone(202) 595-3223
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark S. Johnson is affiliated with 2 sites of care and 1 medical group
Dr. Johnson's primary practice is Howard University in Washington, District of Columbia. Dr. Johnson is also affiliated with Howard University Hospital. The medical group on file is Howard University Faculty Practice Plan.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark S. Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Howard University | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark S. Johnson is one of 241 family medicine physicians in District of Columbia
Family medicine is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 207Q00000X. Dr. Johnson is licensed in New Jersey.
Specialties and state licenses
- Family medicine, New JerseyPrimary
Family medicine physicians near Dr. Johnson
Counts of family medicine physicians 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 S. Johnson billed Medicare for 13 services in 2024
CMS data shows 13 Medicare services from Dr. Johnson across 1 procedure code in 2024, all of them office visits, for 23 Medicare patients. Medicare paid $1,050 for them. Every service was in an office.
Dr. Johnson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 122024: 138%
Dr. Johnson compared with the District of Columbia median for family medicine physicians, 2024
- Dr. Johnson
- District of Columbia median
- Medicare services
- 13vs 8585% below
- Medicare patients
- 23vs 4347% below
- Part D claims
- 59vs 30080% below
Medians across 222 family medicine physicians in District of Columbia 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 S. Johnson treated 23 Medicare patients in 2024, average age 73
CMS counts 23 Medicare patients who saw Dr. Johnson in 2024. The largest group is 65 to 74, with 11 patients. 75% of them have diabetes, and 75% have high blood pressure. Their average risk score is 1.78, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Johnson's median patient age at 56, with 63% women.
Dr. Johnson's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Johnson's Medicare patients by sex, 2024
- Women1252%
- Men1148%
Chronic conditions among Dr. Johnson's Medicare patients, 2024
- Diabetes75%
- High blood pressure75%
- High cholesterol75%
- Arthritis70%
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 56
Patient panel by sex, all payers
- Women63%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark S. Johnson wrote 108 Medicare Part D claims in 2024
In 2024, Dr. Johnson wrote 108 Medicare Part D claims for 15 patients. 95% of them were for generic drugs. CMS names the drug for 59 of them, across 4 drugs with 11 or more claims each, at $1,339 in total drug cost. In 2023, CMS named 26 claims across 2 drugs.
Dr. Johnson's Part D claims by kind of drug, 2024
- Generic103 claims95%
- Brand-name and other5 claims5%
Dr. Johnson's most prescribed drugs by claims, 2024
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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 262024: 59127%
Drugs named by CMS: 4 in 2024, 2 in 2023.
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
Dr. Mark S. Johnson offers telehealth to Medicare patients
Dr. Johnson accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Johnson as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mark S. Johnson received $39,963 in industry payments from 2016 to 2025
CMS Open Payments shows 12 general payments to Dr. Johnson from 7 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 91% of the total. Novo Nordisk Inc paid the most, $39,636.
General payments to Dr. Johnson by program year, 2016 to 2025
General payments to Dr. Johnson by kind, 2016 to 2025
- Consulting fees$36,37191%
- Speaker and faculty fees$2,3806%
- Travel and lodging$8842%
- Food and beverage$3281%
Companies that paid Dr. Johnson the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark S. Johnson graduated from Rutgers New Jersey Medical School
Dr. Johnson graduated from Rutgers New Jersey Medical School in 1979.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark S. 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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 S. 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 S. Johnson's NPI number?
Dr. Mark S. Johnson's NPI number is 1659462190. It was assigned on September 28, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark S. Johnson?
Dr. Mark S. Johnson is a family medicine physician in Washington, District of Columbia. The primary specialty in the NPI Registry is Family Medicine Physician (taxonomy code 207Q00000X).
Where does Dr. Mark S. Johnson practice?
Dr. Johnson practices at 2139 Georgia NW Ave, Washington, DC 20001. Dr. Johnson's primary practice is Howard University in Washington, District of Columbia.
What is Dr. Mark S. Johnson's office phone number?
The practice phone on file for Dr. Johnson is (202) 595-3223.
What is Dr. Mark S. Johnson's medical license number?
Dr. Johnson holds New Jersey license 25MA05722100.
Which hospitals is Dr. Mark S. Johnson affiliated with?
Dr. Johnson is affiliated with Howard University Hospital.
What medical group is Dr. Mark S. Johnson part of?
Dr. Johnson is linked to Howard University Faculty Practice Plan.
Does Dr. Mark S. Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 13 services in 2024, and Dr. Johnson accepts Medicare assignment.
Does Dr. Mark S. Johnson offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Johnson as offering telehealth services.
How many Medicare patients does Dr. Mark S. Johnson see?
CMS counts 23 Medicare patients who saw Dr. Johnson in 2024, with an average age of 73.
Show 5 more questionsShow fewer questions
What services does Dr. Mark S. Johnson bill to Medicare?
In 2024, Dr. Johnson's most billed Medicare services were office visit, established patient (99213).
Where did Dr. Mark S. Johnson go to medical school?
Dr. Johnson graduated from Rutgers New Jersey Medical School in 1979.
What drugs does Dr. Mark S. Johnson prescribe most?
In 2024 Medicare Part D data, Dr. Johnson's most prescribed drugs by claims were Atorvastatin Calcium, Losartan Potassium and Metformin HCl.
Has Dr. Mark S. Johnson received payments from drug or device companies?
CMS Open Payments shows $39,963 in general payments to Dr. Johnson from 7 companies from 2016 to 2025. The largest total came from Novo Nordisk Inc.
How long has Dr. Mark S. Johnson been practicing?
Dr. Johnson graduated from medical school in 1979, 47 years ago.
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