Aaron Si Arn Ranbaduge Leong
Endocrinology, Diabetes & Metabolism Physician · Boston, MA
Aaron Si Arn Ranbaduge Leong is an endocrinology, diabetes & metabolism physician with a practice address in Boston, Massachusetts, and NPI 1770939381, issued on May 12, 2016. Check the license (Massachusetts 266689, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Aaron Si Arn Ranbaduge Leong
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 266689 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St RM 940K, Boston, MA 02114
- Phone
- (617) 724-3203
- Enumerated
- May 12, 2016
- Record last updated
- Feb 10, 2022
- Fax
- (617) 724-2718
- Medicare enrollment
- Enrolled (PECOS I20161004000614); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 522 in Massachusetts → Look up another NPI →
Verify Aaron Si Arn Ranbaduge Leong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 266689Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
496 Medicare Part D claims for 82 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 59% of claims.
Most prescribed
- Ozempic63 claims
- Jardiance52 claims
- Trulicity51 claims
- Testosterone28 claims
- Metformin Hcl Er27 claims
- Alendronate Sodium26 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).
Aaron Si Arn Ranbaduge Leong among 522 endocrinology, diabetes & metabolism physician records in Massachusetts
Aaron Si Arn Ranbaduge Leong 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 2016, is newer than 85% of them.
- NPI issued2016 · 85% of these records are older, 12% 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 updated2022 · 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 Aaron Si Arn Ranbaduge Leong's NPI number?
Aaron Si Arn Ranbaduge Leong's National Provider Identifier (NPI) is 1770939381, issued on May 12, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Aaron Si Arn Ranbaduge Leong located?
The NPPES record lists a practice address at 55 Fruit St RM 940K, Boston, MA, 02114. Phone: (617) 724-3203. Providers update this record themselves, so call before visiting.
How can I verify Aaron Si Arn Ranbaduge Leong's license?
NPPES lists Massachusetts license number 266689, 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 Aaron Si Arn Ranbaduge Leong prescribe under Medicare Part D?
In 2024, Aaron Si Arn Ranbaduge Leong had 496 Medicare Part D claims for 82 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.