John Martin-Joy, M.D.
Psychiatry Physician · Cambridge, MA
John Martin-Joy, M.D. is a psychiatry physician with a practice address in Cambridge, Massachusetts, and NPI 1023169141, issued on Jan 16, 2007. Check the license (Massachusetts 210262, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John Martin-Joy
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 210262 MA
Self-reported in NPPES; status is on the state search - Practice location
- 875 Massachusetts Ave Ste 22, Cambridge, MA 02139
- Phone
- (617) 417-6902
- Enumerated
- Jan 16, 2007
- Entity
- Type 1 · individual
Verify John Martin-Joy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 210262Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
83% fewer Medicare Part D claims than the average psychiatry physician in 2024
173 Medicare Part D claims for 18 beneficiaries, against an average of 1,010 among the 32,287 providers of this specialty who prescribed in Part D.
Most prescribed
- Escitalopram Oxalate16 claims
- Sertraline Hcl14 claims
- Clonazepam13 claims
- Fluvoxamine Maleate12 claims
- Mirtazapine12 claims
- Methylphenidate Er11 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.
One hospital or facility affiliation
- Mount Auburn HospitalCambridge, MA · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
208 psychiatry physician records list a Cambridge practice address
They are 208 of the 5,145 NPPES records with a Cambridge practice address, and 2,637 psychiatry physician records in Massachusetts.
All 208 in Cambridge → All 2,637 in Massachusetts → Every provider in Cambridge →
Other psychiatry physician records in Massachusetts
- Karen Abdool, M.D., PH.DLynn, MA1942472824
- Harmony Abejuela, M.D.Quincy, MA1316259492
- Marielle Abell, PAAmherst, MA1275644072
- Steven Ablon, MDBoston, MA1083604839
- Keith Ablow, M.D.Newbury, MA1245423615
- Yousef Abou-Allaban, MDWalpole, MA1922040666
- Habiba Abozeid, MDBoston, MA1689408346
- Margarita Abramovich, MDPittsfield, MA1154883239
- Howard Abrams, MDSalem, MA1821102773
- David Abramson, MDCambridge, MA1376679787
Common questions
What is John Martin-Joy, M.D.'s NPI number?
John Martin-Joy, M.D.'s National Provider Identifier (NPI) is 1023169141, issued on Jan 16, 2007. An NPI identifies a provider in billing; it is not a license.
Where is John Martin-Joy, M.D. located?
The NPPES record lists a practice address at 875 Massachusetts Ave Ste 22, Cambridge, MA, 02139. Phone: (617) 417-6902. Providers update this record themselves, so call before visiting.
How can I verify John Martin-Joy, M.D.'s license?
NPPES lists Massachusetts license number 210262, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Martin-Joy, M.D. prescribe under Medicare Part D?
In 2024, John Martin-Joy, M.D. had 173 Medicare Part D claims for 18 beneficiaries; the average among psychiatry physician prescribers was 1,010. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.