Mary Leung, MD
NPI 1023278306 · Internal Medicine Physician · Rockville Centre, NY
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Leung, MD is a Internal Medicine Physician provider in Rockville Centre, NY (NPI 1023278306).
Provider details
- NPI number
- 1023278306
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 245464 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,245 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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 1,536 | $9 |
| Complete Blood Cell Count (red Cells, White Blood Cell, Platelets), Automated Test and Automated Differential White Blood Cell Count85025 | 1,494 | $8 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,286 | $145 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 362 | $16 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 176 | $87 |
| Blood Test, Clotting Time85610 | 119 |
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 |
|---|---|---|
| Hydroxyurea | 77 | 20 |
| Anastrozole | 52 | 17 |
| Letrozole | 45 | 15 |
| Apixabanbrand: Eliquis | 34 | — |
| Rivaroxabanbrand: Xarelto | 32 | — |
| Ibrutinibbrand: Imbruvica | 29 | — |
| Warfarin Sodium | 19 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$688 across 31 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
Registry dates
- Enumerated
- 2008-06-11
- Last updated
- 2017-03-09
Frequently asked questions
- What is Mary Leung's NPI number?
- Mary Leung's National Provider Identifier (NPI) is 1023278306, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Leung's specialty?
- Mary Leung is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Leung located?
- Mary Leung's practice location on file with NPPES is 242 Merrick Rd Ste 301, Rockville Centre, NY 11570-5254.
- What is Mary Leung's phone number?
- The practice phone number listed in the NPPES registry for Mary Leung is (516) 536-1455.
- Does Mary Leung accept Medicare?
- Mary Leung is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Leung's NPI active?
- Yes — Mary Leung's NPI (1023278306) is active in the NPPES registry as of the last update on 2017-03-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.