John Leung, M.D.
NPI 1447328711 · Gastroenterology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Leung, M.D. is a Gastroenterology Physician provider in Boston, MA (NPI 1447328711).
Provider details
- NPI number
- 1447328711
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 230907 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,046 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Test for Allergy Using Allergenic Extract95004 | 753 | $4 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 173 | $113 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 69 | $168 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 51 | $89 |
Typical Medicare-allowed amounts for these services range $4–$168 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 56 | 17 |
| Dupilumabbrand: Dupixent Pen | 45 | — |
| Famotidine | 34 | — |
| Nortriptyline Hcl | 30 | — |
| Cromolyn Sodium | 29 | — |
| Cholestyramine (with Sugar)brand: Cholestyramine | 26 | 12 |
| Ondansetron Hcl | 24 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$154,326 across 292 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 1 Nassau St Unit 1906Boston, MA 02111-1587Phone: (617) 804-6767Fax: (877) 726-8492
- 800 Washington StreetBox 1013Boston, MA 02111-1542Phone: (734) 846-4910
Registry dates
- Enumerated
- 2006-12-02
- Last updated
- 2022-07-28
- Certified
- 2022-07-28
Frequently asked questions
- What is John Leung's NPI number?
- John Leung's National Provider Identifier (NPI) is 1447328711, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Leung's specialty?
- John Leung is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Leung located?
- John Leung's practice location on file with NPPES is 65 Harrison Ave Ste 201, Boston, MA 02111-1924.
- What is John Leung's phone number?
- The practice phone number listed in the NPPES registry for John Leung is (617) 804-6767.
- Does John Leung accept Medicare?
- John Leung is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Leung's NPI active?
- Yes — John Leung's NPI (1447328711) is active in the NPPES registry as of the last update on 2022-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.