Dr. Mark D. Johnson, MD, PhD
- Medicare services, 2024
- 150
- Medicare patients, 2024
- 127
- Publications
- 1
- Hospital affiliations
- 4
- Industry payments
- $413
- Practice address
- 55 North Ave, Mendon, MA 01756
- Practice phone
- Call (508) 334-1000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Umass Memorial Medical Center
Mendon, Massachusetts
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 D. Johnson is a neurosurgeon in Mendon, Massachusetts
Dr. Johnson practices at Umass Memorial Medical Center in Mendon, Massachusetts.
Dr. Johnson's NPI, 1578501797, was assigned on June 2, 2006. Dr. Johnson graduated from Harvard Medical School in 1995. Dr. Johnson holds Massachusetts license 217384.
- NPI
- 1578501797NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638353360
- NPI enumeration date
- June 2, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (508) 334-1000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 57
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark D. Johnson practices at Umass Memorial Medical Center in Mendon, Massachusetts
Dr. Johnson's primary practice is Umass Memorial Medical Center, at 55 North Ave, Mendon, MA 01756 in Worcester County. The practice phone is (508) 334-1000.
- Umass Memorial Medical Center55 North Ave, Mendon, MA 01756 · Worcester CountyPhone(508) 334-1000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Mark D. Johnson is affiliated with 5 sites of care and 2 medical groups
Dr. Johnson's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dr. Johnson is also affiliated with UMass Memorial Medical Center - University Campus. The medical group on file is UMass Memorial Medical Group. Dmand AI also links Dr. Johnson to 3 more hospitals and 1 medical group, each named with a free account.
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 D. Johnson's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnson practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Umass Memorial Medical Center | Available with a free account |
| +4 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark D. Johnson is one of 182 neurosurgeons in Massachusetts
Neurological surgery is Dr. Johnson's primary specialty in the NPI Registry, under taxonomy code 207T00000X. Dr. Johnson is licensed in Massachusetts.
Specialties and state licenses
- Neurological surgery, MassachusettsPrimary
Neurosurgeons near Dr. Johnson
Counts of neurosurgeons 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 D. Johnson billed Medicare for 150 services in 2024
CMS data shows 150 Medicare services from Dr. Johnson across 6 procedure codes in 2024, for 127 Medicare patients. Medicare paid $13,191 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Johnson's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1312024: 1375%
- Surgery
- 2023: 02024: 13
Dr. Johnson compared with the Massachusetts median for neurosurgeons, 2024
- Dr. Johnson
- Massachusetts median
- Medicare services
- 150vs 20226% below
- Medicare patients
- 127vs 16121% below
Medians across 156 neurosurgeons in Massachusetts 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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Johnson and other neurosurgeons in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark D. Johnson treated 127 Medicare patients in 2024, average age 73
CMS counts 127 Medicare patients who saw Dr. Johnson in 2024. The largest group is 75 to 84, with 50 patients. 75% of them have high cholesterol, and 71% have high blood pressure. 27% are also on Medicaid. Their average risk score is 1.58, 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 74, with 54% women.
Dr. Johnson's Medicare patients by age, 2024
Dr. Johnson's Medicare patients by sex, 2024
- Women7861%
- Men4939%
Chronic conditions among Dr. Johnson's Medicare patients, 2024
- High cholesterol75%
- High blood pressure71%
- Arthritis57%
- Mood disorders47%
- Depression44%
- Anxiety43%
- Stroke or TIA32%
- Diabetes31%
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 74
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark D. 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 D. Johnson has 1 publication on record
Dmand AI links 1 paper to Dr. Johnson in 2012. Dr. Johnson's most frequent co-authors are Duane Russell Hospenthal, MD, PhD, David Ray Tribble, MD and Timothy James Whitman, DO.
Dr. Johnson's most frequent co-authors
- Duane Russell Hospenthal, MD, PhD1 shared paper
- David Ray Tribble, MD1 shared paper
- Timothy James Whitman, DO1 shared paper
Recent publications by Dr. Johnson
See who Dr. Johnson researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johnson works with, so you can find a warm path to the right neurosurgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Mark D. Johnson received $413 in industry payments from 2016 to 2025
CMS Open Payments shows 10 general payments to Dr. Johnson from 5 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 95% of the total. Integra LifeSciences Corporation paid the most, $178.
General payments to Dr. Johnson by program year, 2016 to 2025
General payments to Dr. Johnson by kind, 2016 to 2025
- Food and beverage$39395%
- Education$205%
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 D. Johnson graduated from Harvard Medical School
Dr. Johnson graduated from Harvard Medical School in 1995.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark D. 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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 D. 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 D. Johnson's NPI number?
Dr. Mark D. Johnson's NPI number is 1578501797. It was assigned on June 2, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. Johnson?
Dr. Mark D. Johnson is a neurosurgeon in Mendon, Massachusetts. The primary specialty in the NPI Registry is Neurological Surgery Physician (taxonomy code 207T00000X).
Where does Dr. Mark D. Johnson practice?
Dr. Johnson practices at 55 North Ave, Mendon, MA 01756. Dr. Johnson's primary practice is Umass Memorial Medical Center in Mendon, Massachusetts. Dmand AI also links Dr. Johnson to 3 hospitals and 1 medical group.
What is Dr. Mark D. Johnson's office phone number?
The practice phone on file for Dr. Johnson is (508) 334-1000.
What is Dr. Mark D. Johnson's medical license number?
Dr. Johnson holds Massachusetts license 217384.
Which hospitals is Dr. Mark D. Johnson affiliated with?
Dr. Johnson is affiliated with UMass Memorial Medical Center - University Campus. Dmand AI links Dr. Johnson to 3 more hospitals.
What medical group is Dr. Mark D. Johnson part of?
Dr. Johnson is linked to UMass Memorial Medical Group. Dmand AI links Dr. Johnson to 1 more medical group.
Does Dr. Mark D. Johnson accept Medicare?
Yes. CMS data shows Dr. Johnson billed Medicare for 150 services in 2024, and Dr. Johnson accepts Medicare assignment.
Does Dr. Mark D. Johnson offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Johnson as offering telehealth services.
How many Medicare patients does Dr. Mark D. Johnson see?
CMS counts 127 Medicare patients who saw Dr. Johnson in 2024, with an average age of 73.
Show 6 more questionsShow fewer questions
What services does Dr. Mark D. Johnson bill to Medicare?
In 2024, Dr. Johnson's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and office visit, established patient (99215).
Where did Dr. Mark D. Johnson go to medical school?
Dr. Johnson graduated from Harvard Medical School in 1995.
Has Dr. Mark D. Johnson received payments from drug or device companies?
CMS Open Payments shows $413 in general payments to Dr. Johnson from 5 companies from 2016 to 2025. The largest total came from Integra LifeSciences Corporation.
How long has Dr. Mark D. Johnson been practicing?
Dr. Johnson graduated from medical school in 1995, 31 years ago.
Does Dr. Mark D. Johnson do research?
Dmand AI links 1 publication to Dr. Johnson.
Who does Dr. Mark D. Johnson publish with?
Dr. Johnson's most frequent co-authors are Duane Russell Hospenthal, MD, PhD (1 shared paper), David Ray Tribble, MD (1 shared paper) and Timothy James Whitman, DO (1 shared paper).
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