William C. Hsu, M.D.
Endocrinology, Diabetes & Metabolism Physician · Boston, MA
William C. Hsu, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Boston, Massachusetts, and NPI 1679687560, issued on Aug 18, 2006. Check the license (Massachusetts 205045, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- William C. Hsu
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 205045 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Joslin PL, Boston, MA 02215
- Phone
- (617) 732-2665
- Enumerated
- Aug 18, 2006
- Record last updated
- Apr 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 522 in Massachusetts → Look up another NPI →
Also registered at 1 Joslin PL
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Omar Abdelal, MDRetina Specialist (Ophthalmology) Physician1497241962
- Motasem Al-Latayfeh, M.D.Ophthalmology Physician1184855710
- Louise Ambler Osborn, CPNPPediatric Nurse Practitioner1013389386
- Sue-Ellen Anderson-Haynes, MS, RDN, LDNRegistered Dietitian1326329590
- Gillian Arathuzik, RD, LDN, CDEMetabolic Nutrition Registered Dietitian1922023217
Verify William C. Hsu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 205045Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
12 Medicare Part D claims, against an average of 2,630 among the 8,223 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.
William C. Hsu among 522 endocrinology, diabetes & metabolism physician records in Massachusetts
William C. Hsu, M.D. is one of 522 endocrinology, diabetes & metabolism physician records with a practice address in Massachusetts. 82% 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 14% of them.
- NPI issued2006 · 14% of these records are older, 52% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2011 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Massachusetts
There are 522 endocrinology, diabetes & metabolism physician records in Massachusetts.
All 522 in Massachusetts → Every provider in Boston → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Richard Beaser, MDBoston, MA 022151447204540
- Ramachandiran Cooppan, M.D.Boston, MA 022151366499097
- Aaron Cypess, M.D., PH.D.Boston, MA 022151598730749
- Rachael Fawcett, M.D.Boston, MA 022151801879945
- Robert Gabbay, M.D.Boston, MA 022151720036627
- Jason Gaglia, M.D.Boston, MA 022151023098605
- Mark Herman, M.D.Boston, MA 022151043261795
- George King, M.D.Boston, MA 022151669458816
Common questions
What is William C. Hsu, M.D.'s NPI number?
William C. Hsu, M.D.'s National Provider Identifier (NPI) is 1679687560, issued on Aug 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William C. Hsu, M.D. located?
The NPPES record lists a practice address at 1 Joslin PL, Boston, MA, 02215. Phone: (617) 732-2665. Providers update this record themselves, so call before visiting.
How can I verify William C. Hsu, M.D.'s license?
NPPES lists Massachusetts license number 205045, 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 William C. Hsu, M.D. prescribe under Medicare Part D?
In 2024, William C. Hsu, M.D. had 12 Medicare Part D claims; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.