Mary D. Sun, MD
Psychiatry Physician · Boston, MA
Mary D. Sun, MD is a psychiatry physician with a practice address in Boston, Massachusetts, and NPI 1528757580, issued on May 4, 2023. Check the license (Massachusetts 3014023, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Mary D. Sun
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 3014023 MA
Self-reported in NPPES; status is on the state search - Practice location
- 75 Francis St, Boston, MA 02115
- Phone
- (617) 732-5500
- Enumerated
- May 4, 2023
- Record last updated
- May 19, 2023
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mary D. Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 3014023Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average psychiatry physician in 2024
11 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
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.
Mary D. Sun among 2,736 psychiatry physician records in Massachusetts
Mary D. Sun, MD is one of 2,736 psychiatry physician records with a practice address in Massachusetts. 65% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 97% of them.
- NPI issued2023 · 97% of these records are older, 2% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · 45% of these records are
- Record last updated2023 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
845 psychiatry physician records list a practice address in Boston
They are 845 of the 41,865 NPPES records with a practice address in Boston, and 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in Boston → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Jay Baer, MDBoston, MA 021151427014323
- Susan Block, MDBoston, MA 021151083681563
- Ilana Braun, M.D.Boston, MA 021151760443006
- Alison Fife, MDBoston, MA 021151477545143
- Melissa Frumin, MD MSBoston, MA 021151659337871
- David Gitlin, MDBoston, MA 021151720078967
- Randy Glassman, MDBoston, MA 021151316937543
- Christine Kim, MDBoston, MA 021151942266283
Common questions
What is Mary D. Sun, MD's NPI number?
Mary D. Sun, MD's National Provider Identifier (NPI) is 1528757580, issued on May 4, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Mary D. Sun, MD located?
The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-5500. Providers update this record themselves, so call before visiting.
How can I verify Mary D. Sun, MD's license?
NPPES lists Massachusetts license number 3014023, 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 Mary D. Sun, MD prescribe under Medicare Part D?
In 2024, Mary D. Sun, MD had 11 Medicare Part D claims; the average among psychiatry physician prescribers was 1,000. 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.