DR. JOHN LEUNG (M.D.) – Gastroenterology Physician, NPI 1447328711
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
830 GASTROENTEROLOGY in MA
Provider Addresses for DR. JOHN LEUNG (M.D.)
800 Washington Street
Box 1013
Boston, MA 021111542
Phone: (734) 846-4910
Type: Location
1 Nassau St Unit 1906
Boston, MA 021111587
Phone: (617) 804-6767
Fax: (877) 726-8492
Type: Location
Tufts Medical Center, 800, Washington Street, Chinatown, Financial District, Boston, Suffolk County, Massachusetts, 02111, United States
BOX 1013
BOSTON, MA 021111542
Phone: (734) 846-4910
Type: Mailing
65 HARRISON AVE STE 201
BOSTON, MA 021111924
Phone: (617) 804-6767
Fax: (877) 726-8492
Type: Location
1 NASSAU ST UNIT 1906
BOSTON, MA 021111587
Phone: (617) 804-6767
Fax: (877) 726-8492
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 522 Open Payments records for all available years, with a total value of $275,549.
Total Amount is formed as General ($275,549) + Research ($0) + Ownership ($0) = $275,549.
Last reported payment date: 2024-12-31 • Largest payer in this snapshot: GENZYME CORPORATION ($103,289).
Total Amount
$275,549
General + Research + Ownership
Payments
522
Total payment records
General Amount
$275,549
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-31
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GENZYME CORPORATION | $103,289 |
| Regeneron Healthcare Solutions, Inc. | $89,332 |
| ABBVIE INC. | $22,859 |
| Intuitive Surgical, Inc. | $20,900 |
| Takeda Pharmaceuticals U.S.A., Inc. | $11,322 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2010-07-27
PECOS data refreshed: 2026-06-15
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100727000640 | I | Gastroenterology | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 146 | 65 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 57 | 57 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 46 | 30 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 13 | 13 | $0 |
Insurance plans in this area (ZIP 02111)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | MA | 95004 | Injection of allergenic extracts into skin, accessed through the skin | 1303 | 21 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Pediatric Medicine, Allergy/Immunology | CA | |
| Allergy/Immunology, Internal Medicine | NY |
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