John Gregory, M.D.
NPI 1457307340 · Pediatric Hematology & Oncology Physician · Morristown, NJ
John Gregory, M.D. is a Pediatric Hematology & Oncology Physician provider in Morristown, NJ (NPI 1457307340).
Provider details
- NPI number
- 1457307340
- Entity type
- Individual
- Primary specialty
- Pediatric Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 25MA06944600 (NJ)
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
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
Mailing address
Registry dates
- Enumerated
- 2006-05-25
- Last updated
- 2008-03-25
Frequently asked questions
- What is John Gregory's NPI number?
- John Gregory's National Provider Identifier (NPI) is 1457307340, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Gregory's specialty?
- John Gregory is listed in the NPPES registry with a primary specialty of Pediatric Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is John Gregory located?
- John Gregory's practice location on file with NPPES is 100 Madison Ave, Morristown, NJ 07960-6136.
- What is John Gregory's phone number?
- The practice phone number listed in the NPPES registry for John Gregory is (973) 971-6720.
- Is John Gregory's NPI active?
- Yes — John Gregory's NPI (1457307340) is active in the NPPES registry as of the last update on 2008-03-25.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.