Marshall Diven, MD, MS
NPI 1649809351 · Radiation Oncology Physician · Brooklyn, NY
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marshall Diven, MD, MS is a Radiation Oncology Physician provider in Brooklyn, NY (NPI 1649809351).
Provider details
- NPI number
- 1649809351
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, MS
- Sex
- Male
- Sole proprietor
- No
- License
- 18641A (WY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 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
- 2020-04-04
- Last updated
- 2025-10-16
- Certified
- 2025-10-16
Frequently asked questions
- What is Marshall Diven's NPI number?
- Marshall Diven's National Provider Identifier (NPI) is 1649809351, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marshall Diven's specialty?
- Marshall Diven is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Marshall Diven located?
- Marshall Diven's practice location on file with NPPES is 506 6th St, Brooklyn, NY 11215-3609.
- What is Marshall Diven's phone number?
- The practice phone number listed in the NPPES registry for Marshall Diven is (718) 780-3000.
- Does Marshall Diven accept Medicare?
- Marshall Diven is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marshall Diven's NPI active?
- Yes — Marshall Diven's NPI (1649809351) is active in the NPPES registry as of the last update on 2025-10-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.