ALEXANDER NISSEN
NPI 1730540386
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Bethesda, MD
About Alexander Nissen NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDER NISSEN (NPI 1730540386) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Bethesda, Maryland, licensed in Virginia (0101263081) and active in the NPI registry since March 2016. He is enrolled in Medicare PECOS and is a graduate of Other (2016).
NPPES Registry Identity
Specialties & Licenses 2
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
Alexander Nissen 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 Alexander Nissen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Washington, DC 20007
- Reassigned Medicare billing, District of Columbia enrollment
- 3,530 clinicians in this Medicare group
Washington, DC 20010
- Reassigned Medicare billing, District of Columbia enrollment
- 277 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 20889 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.
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
BETHESDA, MD 20889
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 Alexander Nissen's NPI number?
The NPI number for Alexander Nissen is 1730540386. It was assigned to this individual provider in the NPPES registry on March 10, 2016.
Where is Alexander Nissen located?
Alexander Nissen practices at Walter Reed National Military Medical Center 8901 Wisconsin Ave, Bethesda, MD 20889. The listed phone number is (703) 401-2509.
What is Alexander Nissen's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is Alexander Nissen enrolled in Medicare?
Yes. Alexander Nissen 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 Alexander Nissen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexander Nissen reassigns Medicare benefits to 2 organizations: Medstar Medical Group II LLC (Washington, DC) and Medstar Heart Institute LLC (Washington, DC). 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 Alexander Nissen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Alexander Nissen was last updated on August 20, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Alexander Nissen · NPI 1730540386
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Bethesda, Maryland. Individual provider, active in the CMS NPPES registry since March 10, 2016.
## Identity
- **NPI:** 1730540386 (Entity type: Individual)
- **Enumerated:** March 10, 2016
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** 0101263081 (Virginia)
- **Sole proprietor:** No
## Practice location
- **Address:** WALTER REED NATIONAL MILITARY MEDICAL CENTER, 8901 WISCONSIN AVE, Bethesda, MD 20889-0004
- **Phone:** (703) 401-2509
## 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): Medstar Medical Group II LLC (NPI 1205562816, Washington, DC); Medstar Heart Institute LLC (NPI 1528345378, Washington, DC) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2016
## Record status
- **NPPES last updated:** August 20, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1730540386) · Data from the CMS NPPES public registry.