Katie Greenzang, M.D.
NPI 1437391000 · Pediatric Hematology & Oncology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Katie Greenzang, M.D. is a Pediatric Hematology & Oncology Physician provider in Boston, MA (NPI 1437391000).
Provider details
- NPI number
- 1437391000
- Entity type
- Individual
- Primary specialty
- Pediatric Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 254298 (MA)
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
17 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
Mailing address
Registry dates
- Enumerated
- 2009-03-29
- Last updated
- 2014-02-13
Frequently asked questions
- What is Katie Greenzang's NPI number?
- Katie Greenzang's National Provider Identifier (NPI) is 1437391000, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Katie Greenzang's specialty?
- Katie Greenzang is listed in the NPPES registry with a primary specialty of Pediatric Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Katie Greenzang located?
- Katie Greenzang's practice location on file with NPPES is 450 Brookline Ave, Boston, MA 02215-5418.
- What is Katie Greenzang's phone number?
- The practice phone number listed in the NPPES registry for Katie Greenzang is (617) 632-3352.
- Does Katie Greenzang accept Medicare?
- Katie Greenzang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Katie Greenzang's NPI active?
- Yes — Katie Greenzang's NPI (1437391000) is active in the NPPES registry as of the last update on 2014-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.