IndividualActive
Leonard Zon, MD
NPI 1245299197 · Hematology & Oncology Physician · Boston, MA
Leonard Zon, MD is a Hematology & Oncology Physician provider in Boston, MA (NPI 1245299197).
Provider details
- NPI number
- 1245299197
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- 55881 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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.
Practice location
300 Longwood Ave
Research Building Floor 7
Boston, MA 02115-5724
Phone: (617) 919-2069
Street-level locationGet directions
Mailing address
6 Frost Cir
Wellesley, MA 02482-2336
Registry dates
- Enumerated
- 2006-03-20
- Last updated
- 2007-07-08
Frequently asked questions
- What is Leonard Zon's NPI number?
- Leonard Zon's National Provider Identifier (NPI) is 1245299197, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leonard Zon's specialty?
- Leonard Zon is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Leonard Zon located?
- Leonard Zon's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Leonard Zon's phone number?
- The practice phone number listed in the NPPES registry for Leonard Zon is (617) 919-2069.
- Is Leonard Zon's NPI active?
- Yes — Leonard Zon's NPI (1245299197) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.