DR. JAN ZAKRZEWSKI M.D.
NPI 1063855328
Internal Medicine - Infectious Disease in Upper Marlboro, MD
About Dr. Jan Zakrzewski M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JAN ZAKRZEWSKI M.D. (NPI 1063855328) is an individual infectious disease provider in Upper Marlboro, Maryland, licensed in Maryland (D85540) and active in the NPI registry since April 2013. He is enrolled in Medicare PECOS, is affiliated with Holy Cross Hospital, and maintains a secondary practice location in Washington.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Group Practice 1
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. Jan Zakrzewski M.d. 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 Jan Zakrzewski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Suitland, MD 20746
- Reassigned Medicare billing, District of Columbia enrollment
- 2,492 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 Jan Zakrzewski's NPI number?
The NPI number for Jan Zakrzewski is 1063855328. It was assigned to this individual provider in the NPPES registry on April 16, 2013.
Where is Jan Zakrzewski located?
Jan Zakrzewski practices at 1221 Mercantile Ln, Upper Marlboro, MD 20774. The listed phone number is (301) 618-5647.
What is Jan Zakrzewski's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Jan Zakrzewski enrolled in Medicare?
Yes. Jan Zakrzewski 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 Jan Zakrzewski's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jan Zakrzewski reassigns Medicare benefits to Kaiser Foundation Health Plan Of The Mid Atlantic States, Inc (Suitland, 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 Jan Zakrzewski's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Jan Zakrzewski affiliated with any hospitals?
According to CMS data, Jan Zakrzewski is affiliated with Holy Cross Hospital.
When was this NPI record last updated?
The NPPES record for Jan Zakrzewski was last updated on May 28, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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. Jan Zakrzewski, M.D. · NPI 1063855328
Infectious Disease physician in Upper Marlboro, Maryland. Individual provider, active in the CMS NPPES registry since April 16, 2013.
## Identity
- **NPI:** 1063855328 (Entity type: Individual)
- **Enumerated:** April 16, 2013
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** D85540 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1221 MERCANTILE LN, Upper Marlboro, MD 20774
- **Phone:** (301) 618-5647 · **Fax:** (301) 618-5504
## 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 1730200965, Suitland, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Buffalo School Of Medicine, class of 2013
## Record status
- **NPPES last updated:** May 28, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1063855328) · Data from the CMS NPPES public registry.