Joy Natalie Tsai, MD
Endocrinology, Diabetes & Metabolism Physician · Boston, MA
Joy Natalie Tsai, MD is an endocrinology, diabetes & metabolism physician with a practice address in Boston, Massachusetts, and NPI 1710134929, issued on Aug 19, 2008. Check the license (Massachusetts 258303, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Joy Natalie Tsai
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License numbers
- 258303 MA
125052821 IL
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St., Boston, MA 02114
- Phone
- (617) 724-7777
- Enumerated
- Aug 19, 2008
- Record last updated
- Mar 19, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (617) 726-7543
- Medicare enrollment
- Enrolled (PECOS I20140620000032); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 2007
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 522 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St.
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joy Natalie Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 258303Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
154 Medicare Part D claims for 46 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D.
Most prescribed
- Alendronate Sodium69 claims
- Levothyroxine Sodium31 claims
- Tymlos11 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.
Bills Medicare through 2 group practices
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joy Natalie Tsai among 522 endocrinology, diabetes & metabolism physician records in Massachusetts
Joy Natalie Tsai, MD 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 2008, is newer than 60% of them.
- NPI issued2008 · 60% of these records are older, 34% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2007 · median 2002 among the 378 with a school on file
- Record last updated2014 · 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
- Joseph Avruch, MDBoston, MA 021141851381941
- Giuseppe Barbesino, MDBoston, MA 021141366432635
- Enrico Cagliero, MDBoston, MA 021141700877347
- William Crowley, MDBoston, MA 021141417947599
- Marie Demay, MDBoston, MA 021141528058153
- Steven Grinspoon, MDBoston, MA 021141457342099
- Janet Hall, MDBoston, MA 021141548251002
- Anne Klibanski, MDBoston, MA 021141518958164
Common questions
What is Joy Natalie Tsai, MD's NPI number?
Joy Natalie Tsai, MD's National Provider Identifier (NPI) is 1710134929, issued on Aug 19, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Joy Natalie Tsai, MD located?
The NPPES record lists a practice address at 55 Fruit St., Boston, MA, 02114. Phone: (617) 724-7777. Providers update this record themselves, so call before visiting.
How can I verify Joy Natalie Tsai, MD's license?
NPPES lists Massachusetts license number 258303, 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 Joy Natalie Tsai, MD prescribe under Medicare Part D?
In 2024, Joy Natalie Tsai, MD had 154 Medicare Part D claims for 46 beneficiaries; 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.