Katherine T. Johnston, M.D., M.A., M.SC.
Internal Medicine Physician · Boston, MA
Katherine T. Johnston, M.D., M.A., M.SC. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1164469763, issued on Jun 1, 2006. Check the license (Massachusetts 226586, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Katherine T. Johnston
- Credential
- M.D., M.A., M.SC.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 226586 MA
Self-reported in NPPES; status is on the state search - Practice location
- 165 Cambridge St Ste 501, Boston, MA 02114
- Phone
- (617) 726-4900
- Enumerated
- Jun 1, 2006
- Record last updated
- Jul 7, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 165 Cambridge St Ste 501
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Micker Amor, NPNurse Practitioner1770036097
- Savanna Conger, NP-CNurse Practitioner1588245906
- Kaitlin Fitzpatrick, M.D.Internal Medicine Physician1932557840
- Tyler Lescure, MDInternal Medicine Physician1518594928
- Erin Lewis, APRNNurse Practitioner1639680788
- Sarah Scott, FNPNurse Practitioner1962177741
Verify Katherine T. Johnston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 226586Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
46% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,713 Medicare Part D claims for 161 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium150 claims
- Amlodipine Besylate108 claims
- Lisinopril73 claims
- Levothyroxine Sodium69 claims
- Estradiol46 claims
- Metoprolol Succinate43 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Katherine T. Johnston among 6,825 internal medicine physician records in Massachusetts
Katherine T. Johnston, M.D., M.A., M.SC. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jaime Chang, MDBoston, MA 021141205825197
- Jeffrey Engelman, MD PHDBoston, MA 021141538159108
- James Evans, MDBoston, MA 021141215939533
- Nicolette Fontaine, MDBoston, MA 021141841287174
- Nancy Gagliano, MDBoston, MA 021141881680767
- Patricia Gibbons, MDBoston, MA 021141619967221
- Steven Hersch, MDBoston, MA 021141174512149
- Mira Kautzky, M.D.Boston, MA 021141972505402
Common questions
What is Katherine T. Johnston, M.D., M.A., M.SC.'s NPI number?
Katherine T. Johnston, M.D., M.A., M.SC.'s National Provider Identifier (NPI) is 1164469763, issued on Jun 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Katherine T. Johnston, M.D., M.A., M.SC. located?
The NPPES record lists a practice address at 165 Cambridge St Ste 501, Boston, MA, 02114. Phone: (617) 726-4900. Providers update this record themselves, so call before visiting.
How can I verify Katherine T. Johnston, M.D., M.A., M.SC.'s license?
NPPES lists Massachusetts license number 226586, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Katherine T. Johnston, M.D., M.A., M.SC. prescribe under Medicare Part D?
In 2024, Katherine T. Johnston, M.D., M.A., M.SC. had 1,713 Medicare Part D claims for 161 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.