Leon Hwang, M.D.
NPI 1972659266 · Hematology & Oncology Physician · Rockville, MD
Enrolled with Medicare as Practitioner - Medical Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leon Hwang, M.D. is a Hematology & Oncology Physician provider in Rockville, MD (NPI 1972659266).
Provider details
- NPI number
- 1972659266
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D45880 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 49 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Anastrozole | 252 | 94 |
| Prednisone | 200 | 42 |
| Abiraterone Acetate | 151 | 25 |
| Dexamethasone | 135 | 41 |
| Tamoxifen Citrate | 80 | 27 |
| Epoetin Alfabrand: Procrit | 78 | 12 |
| Ondansetronbrand: Ondansetron Odt | 62 | 45 |
| Filgrastim-Aafi |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-26
- Last updated
- 2022-01-19
- Certified
- 2022-01-19
Frequently asked questions
- What is Leon Hwang's NPI number?
- Leon Hwang's National Provider Identifier (NPI) is 1972659266, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leon Hwang's specialty?
- Leon Hwang is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Leon Hwang located?
- Leon Hwang's practice location on file with NPPES is 1396 Piccard Dr, Rockville, MD 20850-4302.
- What is Leon Hwang's phone number?
- The practice phone number listed in the NPPES registry for Leon Hwang is (301) 548-5768.
- Does Leon Hwang accept Medicare?
- Leon Hwang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leon Hwang's NPI active?
- Yes — Leon Hwang's NPI (1972659266) is active in the NPPES registry as of the last update on 2022-01-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.