DR. MARSHALL ANDREW DIVEN MD, MS
NPI 1649809351
Radiology - Radiation Oncology in Brooklyn, NY
About Dr. Marshall Andrew Diven Md, Ms NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARSHALL ANDREW DIVEN MD, MS (NPI 1649809351) is an individual radiation oncology provider in Brooklyn, New York, licensed in Montana (148872) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with Billings Clinic, and is a graduate of University Of South Carolina School Of Medicine, Greenville (2019).
NPPES Registry Identity
Specialties & Licenses 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Marshall Andrew Diven Md, Ms is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Marshall Diven reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Miles City, MT 59301
- Reassigned Medicare billing, Montana and Wyoming enrollments
- Also billed through NPI 1346288347 (Wyoming)
- 1,264 clinicians in this Medicare group
Sheridan, WY 82801
- Reassigned Medicare billing, Wyoming enrollment
- 133 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Billings Clinic
Acute Care Hospitals · Billings, MTSheridan Memorial Hospital
Acute Care Hospitals · Sheridan, WYJohnson County Healthcare Center
Critical Access Hospitals · Buffalo, WYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11215 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BROOKLYN, NY 11215
BROOKLYN, NY 11215
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marshall Diven's NPI number?
The NPI number for Marshall Diven is 1649809351. It was assigned to this individual provider in the NPPES registry on April 4, 2020.
Where is Marshall Diven located?
Marshall Diven practices at 506 6th St, Brooklyn, NY 11215. The listed phone number is (718) 780-3000.
What is Marshall Diven's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.
Is Marshall Diven enrolled in Medicare?
Yes. Marshall Diven is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Marshall Diven's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marshall Diven reassigns Medicare benefits to 2 organizations: Billings Clinic (Miles City, MT) and Memorial Hospital Of Sheridan County (Sheridan, WY). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marshall Diven's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Marshall Diven accept?
Health plans from Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Montana, Mountain Health CO-OP, PacificSource Health Plans and UnitedHealthcare list Marshall Diven as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Marshall Diven affiliated with any hospitals?
According to CMS data, Marshall Diven is affiliated with Billings Clinic, Sheridan Memorial Hospital and Johnson County Healthcare Center.
When was this NPI record last updated?
The NPPES record for Marshall Diven was last updated on October 16, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Marshall Andrew Diven, MD, MS · NPI 1649809351
Radiation Oncology physician in Brooklyn, New York. Individual provider, active in the CMS NPPES registry since April 4, 2020.
## Identity
- **NPI:** 1649809351 (Entity type: Individual)
- **Enumerated:** April 4, 2020
- **Primary specialty:** Radiology - Radiation Oncology · taxonomy 2085R0001X
- **State license:** 148872 (Montana)
- **Sole proprietor:** No
## Practice location
- **Address:** 506 6TH ST, Brooklyn, NY 11215-3609
- **Phone:** (718) 780-3000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Billings Clinic (NPI 1427194836, Miles City, MT); Memorial Hospital Of Sheridan County (NPI 1487707188, Sheridan, WY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of South Carolina School Of Medicine, Greenville, class of 2019
## Record status
- **NPPES last updated:** October 16, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1649809351) · Data from the CMS NPPES public registry.