Aaron Leong
NPI 1770939381 · Endocrinology, Diabetes & Metabolism Physician · Boston, MA
Enrolled with Medicare as Practitioner - Endocrinology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Aaron Leong is a Endocrinology, Diabetes & Metabolism Physician provider in Boston, MA (NPI 1770939381).
Provider details
- NPI number
- 1770939381
- Entity type
- Individual
- Primary specialty
- Endocrinology, Diabetes & Metabolism PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- 266689 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
348 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 66 | $192 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 47 | $82 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 42 | $150 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 37 | $52 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 29 | $102 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Semaglutidebrand: Ozempic | 63 | 16 |
| Empagliflozinbrand: Jardiance | 52 | 13 |
| Dulaglutidebrand: Trulicity | 51 | — |
| Testosterone | 28 | — |
| Metformin Hclbrand: Metformin Hcl Er | 27 | — |
| Alendronate Sodium | 26 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-05-12
- Last updated
- 2022-02-10
- Certified
- 2021-12-01
Frequently asked questions
- What is Aaron Leong's NPI number?
- Aaron Leong's National Provider Identifier (NPI) is 1770939381, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Aaron Leong's specialty?
- Aaron Leong is listed in the NPPES registry with a primary specialty of Endocrinology, Diabetes & Metabolism Physician (Allopathic & Osteopathic Physicians).
- Where is Aaron Leong located?
- Aaron Leong's practice location on file with NPPES is 55 Fruit St Rm 940k, Boston, MA 02114-2621.
- What is Aaron Leong's phone number?
- The practice phone number listed in the NPPES registry for Aaron Leong is (617) 724-3203.
- Does Aaron Leong accept Medicare?
- Aaron Leong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Aaron Leong's NPI active?
- Yes — Aaron Leong's NPI (1770939381) is active in the NPPES registry as of the last update on 2022-02-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.