PAUL SACKSTEIN
NPI 1639639792
Internal Medicine - Hematology & Oncology in Upper Marlboro, MD
About Paul Sackstein NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PAUL SACKSTEIN (NPI 1639639792) is an individual hematology & oncology provider in Upper Marlboro, Maryland, licensed in Maryland (D0103377) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Holy Cross Hospital, and is a graduate of University Of Connecticut School Of Medicine (2019).
NPPES Registry Identity
Specialties & Licenses
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
Paul Sackstein 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 Reassignment
Medicare enrollment records show Paul Sackstein reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Largo, MD 20774
- Reassigned Medicare billing, District of Columbia enrollment
- Also billed through NPI 1730200965 (District of Columbia)
- 752 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Holy Cross Hospital
Acute Care Hospitals · Silver Spring, MDPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20774 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.
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
LARGO, MD 20774
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 Paul Sackstein's NPI number?
The NPI number for Paul Sackstein is 1639639792. It was assigned to this individual provider in the NPPES registry on March 23, 2019.
Where is Paul Sackstein located?
Paul Sackstein practices at 1221 Mercantile Ln, Upper Marlboro, MD 20774. The listed phone number is (301) 618-5500.
What is Paul Sackstein's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Paul Sackstein enrolled in Medicare?
Yes. Paul Sackstein 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 organization bills Medicare for Paul Sackstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Paul Sackstein reassigns Medicare benefits to Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Largo, MD). The 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 Paul Sackstein's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Paul Sackstein affiliated with any hospitals?
According to CMS data, Paul Sackstein is affiliated with Holy Cross Hospital.
When was this NPI record last updated?
The NPPES record for Paul Sackstein was last updated on June 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Paul Sackstein · NPI 1639639792
Hematology & Oncology physician in Upper Marlboro, Maryland. Individual provider, active in the CMS NPPES registry since March 23, 2019.
## Identity
- **NPI:** 1639639792 (Entity type: Individual)
- **Enumerated:** March 23, 2019
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **State license:** D0103377 (Maryland)
- **Sole proprietor:** No
## Practice location
- **Address:** 1221 MERCANTILE LN, Upper Marlboro, MD 20774-5374
- **Phone:** (301) 618-5500
## 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:** Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (NPI 1366781700, Largo, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Connecticut School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** June 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1639639792) · Data from the CMS NPPES public registry.