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Dr. Katherine T. Johnston, MA, MD, MS
NPI1164469763
- Medicare services, 2024
- 436
- Medicare patients, 2024
- 104
- Part D claims, 2024
- 1,713
- Publications
- 6
- Hospital affiliations
- 1
- Practice address
- 55 Fruit Street, Boston, MA 02114
- Practice phone
- Call (617) 726-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Johnston's professional email, personal email and mobile number
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Dr. Katherine T. Johnston is an internist in Boston, Massachusetts
Dr. Johnston practices at Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham.
Dr. Johnston's NPI, 1164469763, was assigned on June 1, 2006. Dr. Johnston graduated from Loyola University of Chicago, Stritch School of Medicine in 2003. Dr. Johnston holds Massachusetts license 226586.
NPI and contact details
- NPI
- 1164469763NPI Registry (opens in a new tab)
- NPI enumeration date
- June 1, 2006
- NPI status
- Active
- Practice phone
- (617) 726-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Katherine T. Johnston practices at Massachusetts General Hospital in Boston, Massachusetts
Dr. Johnston's primary practice is Massachusetts General Hospital, at 55 Fruit Street, Boston, MA 02114 in Suffolk County. The practice phone is (617) 726-2000.
- Massachusetts General Hospital55 Fruit Street, Boston, MA 02114 · Suffolk CountyPhone(617) 726-2000
Source: Dmand AI Affiliation Data
Dr. Katherine T. Johnston is affiliated with 4 sites of care and 2 medical groups
Dr. Johnston's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. The medical group on file is Massachusetts General Physicians Organization (MGPO). Dmand AI also links Dr. Johnston to 2 more group practices and clinics, 1 community health center and 1 medical group, each named with a free account.
Massachusetts General Physicians Organization (MGPO)2 group practices and clinicsNames with a free account1 community health centerName with a free account1 medical groupName with a free account
See all 6 affiliations for Dr. JohnstonSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Katherine T. Johnston's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Johnston practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Massachusetts General Hospital | Available with a free account |
| +3 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Katherine T. Johnston is one of 5,528 internists in Massachusetts
Internal medicine is Dr. Johnston's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Johnston is licensed in Massachusetts.
Specialties and state licenses
- Internal medicine, MassachusettsPrimary
Internists near Dr. Johnston
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
5,528internists in Massachusetts1,712internists in Boston446internists at Massachusetts General Hospital
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Katherine T. Johnston billed Medicare for 436 services in 2024
CMS data shows 436 Medicare services from Dr. Johnston across 6 procedure codes in 2024, for 104 Medicare patients. Medicare paid $37,472 for them. Every service was in an office.
Medicare services, 2024436
Medicare patients104
Paid by Medicare$37,472
Procedure codes6
Dr. Johnston's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2812024: 21424%
- Other services
- 2023: 922024: 14962%
- Surgery
- 2023: 1082024: 7332%
- Tests and treatments
- 2023: 442024: 0100%
Dr. Johnston compared with the Massachusetts median for internists, 2024
- Dr. Johnston
- Massachusetts median
- Medicare services
- 436vs 431Close to median
- Medicare patients
- 104vs 19446% below
- Part D claims
- 1,383vs 4023.4 times
Medians across 5,369 internists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Johnston'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. Johnston and other internists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Katherine T. Johnston treated 104 Medicare patients in 2024, average age 73
CMS counts 104 Medicare patients who saw Dr. Johnston in 2024. The largest group is 65 to 74, with 60 patients. 68% of them have high cholesterol, and 54% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.14, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Johnston's median patient age at 69, with 92% women.
Medicare patients, 2024104
Average age73
Average risk score1.14
Also on Medicaid11%
Dr. Johnston's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Johnston's Medicare patients, 2024
- High cholesterol68%
- High blood pressure54%
- Arthritis45%
- Anxiety39%
- Cancer36%
- Mood disorders34%
- Depression33%
- Osteoporosis33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Johnston's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women92%
- Men7%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Katherine T. Johnston wrote 1,713 Medicare Part D claims in 2024
In 2024, Dr. Johnston wrote 1,713 Medicare Part D claims for 161 patients. 85% of them were for generic drugs. CMS names the drug for 1,383 of them, across 45 drugs with 11 or more claims each, at $183,134 in total drug cost. In 2023, CMS named 1,400 claims across 48 drugs.
Part D claims, 20241,713
Drugs named by CMS45
Total drug cost$183,134
Part D patients161
Dr. Johnston's Part D claims by kind of drug, 2024
- Generic1,456 claims85%
- Brand-name and other257 claims15%
Dr. Johnston'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.
Drug classes CMS tracks in Dr. Johnston's Part D claims, 2024
- Antibiotics1%17 of 1,713 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,4002024: 1,3831%
Drugs named by CMS: 45 in 2024, 48 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
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Dr. Katherine T. Johnston has 6 publications on record
Dmand AI links 6 papers to Dr. Johnston, published from 2017 to 2025. 2020 was the busiest year, with 2. The most frequent topics are Breast Neoplasms, Documentation and Electronic Health Records. Dr. Johnston's most frequent co-authors are Anita Vanka, MD, Mark D. Aronson, MD and Pragya Ahuja Dang, MBBS.
Papers6
Years published2017 to 2025
Dr. Johnston's papers by year, 2017 to 2025
Topics Dr. Johnston writes about most
- Breast Neoplasms
- Documentation
- Electronic Health Records
- Patient-Centered Care
Dr. Johnston's most frequent co-authors
- Anita Vanka, MD2 shared papers
- Mark D. Aronson, MD1 shared paper
- Pragya Ahuja Dang, MBBS1 shared paper
Recent publications by Dr. Johnston
CurriculumDocumentationElectronic Health Records
Clin Breast Cancer
Breast NeoplasmsCancer SurvivorsFear
Clinical ClerkshipEducation, Medical, GraduateHospital Medicine
See who Dr. Johnston researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Johnston works with, so you can find a warm path to the right internists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Katherine T. Johnston graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Johnston graduated from Loyola University of Chicago, Stritch School of Medicine in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Katherine T. Johnston'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Katherine T. Johnston
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. Katherine T. Johnston's NPI number?
Dr. Katherine T. Johnston's NPI number is 1164469763. It was assigned on June 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Katherine T. Johnston?
Dr. Katherine T. Johnston is an internist in Boston, Massachusetts. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Katherine T. Johnston practice?
Dr. Johnston practices at 55 Fruit Street, Boston, MA 02114. Dr. Johnston's primary practice is Massachusetts General Hospital in Boston, Massachusetts, part of Mass General Brigham. Dmand AI also links Dr. Johnston to 2 group practices and clinics, 1 community health center and 1 medical group.
What is Dr. Katherine T. Johnston's office phone number?
The practice phone on file for Dr. Johnston is (617) 726-2000.
What is Dr. Katherine T. Johnston's medical license number?
Dr. Johnston holds Massachusetts license 226586.
Which hospitals is Dr. Katherine T. Johnston affiliated with?
Dr. Johnston practices at Massachusetts General Hospital in Boston, Massachusetts.
What medical group is Dr. Katherine T. Johnston part of?
Dr. Johnston is linked to Massachusetts General Physicians Organization (MGPO). Dmand AI links Dr. Johnston to 1 more medical group.
Does Dr. Katherine T. Johnston accept Medicare?
Yes. CMS data shows Dr. Johnston billed Medicare for 436 services in 2024.
How many Medicare patients does Dr. Katherine T. Johnston see?
CMS counts 104 Medicare patients who saw Dr. Johnston in 2024, with an average age of 73.
What services does Dr. Katherine T. Johnston bill to Medicare?
In 2024, Dr. Johnston's most billed Medicare services were office visit, established patient (99215), medicare service (G2211) and surgery: heart and blood vessels (36415).
Show 5 more questionsShow fewer questions
Where did Dr. Katherine T. Johnston go to medical school?
Dr. Johnston graduated from Loyola University of Chicago, Stritch School of Medicine in 2003.
What drugs does Dr. Katherine T. Johnston prescribe most?
In 2024 Medicare Part D data, Dr. Johnston's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Lisinopril.
How long has Dr. Katherine T. Johnston been practicing?
Dr. Johnston graduated from medical school in 2003, 23 years ago.
Does Dr. Katherine T. Johnston do research?
Dmand AI links 6 publications to Dr. Johnston, published from 2017 to 2025.
Who does Dr. Katherine T. Johnston publish with?
Dr. Johnston's most frequent co-authors are Anita Vanka, MD (2 shared papers), Mark D. Aronson, MD (1 shared paper) and Pragya Ahuja Dang, MBBS (1 shared paper).
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