ALEXANDRA LYNN LARSEN MD, MSC
NPI 1437853173
Internal Medicine in Philadelphia, PA
About Alexandra Lynn Larsen Md, Msc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ALEXANDRA LYNN LARSEN MD, MSC (NPI 1437853173) is an individual internal medicine provider in Philadelphia, Pennsylvania, licensed in Pennsylvania (MD494368) and active in the NPI registry since March 2023. She is enrolled in Medicare PECOS, is affiliated with Main Line Hospital Lankenau, and is a graduate of Perelman School Of Med At The University Of Pennsylvania (2023).
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
Alexandra Lynn Larsen Md, Msc 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 Alexandra Larsen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Newtown Square, PA 19073
- Reassigned Medicare billing, Pennsylvania enrollment
- 1,638 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.
Main Line Hospital Lankenau
Acute Care Hospitals · Wynnewood, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 19104 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.
PHILADELPHIA, PA 19104
PHILADELPHIA, PA 19104
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 Alexandra Larsen's NPI number?
The NPI number for Alexandra Larsen is 1437853173. It was assigned to this individual provider in the NPPES registry on March 28, 2023.
Where is Alexandra Larsen located?
Alexandra Larsen practices at 3400 Spruce St, Philadelphia, PA 19104. The listed phone number is (215) 662-9990.
What is Alexandra Larsen's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Alexandra Larsen enrolled in Medicare?
Yes. Alexandra Larsen 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 Alexandra Larsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Alexandra Larsen reassigns Medicare benefits to Main Line Healthcare (Newtown Square, PA). 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 Alexandra Larsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Alexandra Larsen affiliated with any hospitals?
According to CMS data, Alexandra Larsen is affiliated with Main Line Hospital Lankenau.
When was this NPI record last updated?
The NPPES record for Alexandra Larsen was last updated on June 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Alexandra Lynn Larsen, MD, MSC · NPI 1437853173
Internal Medicine physician in Philadelphia, Pennsylvania. Individual provider, active in the CMS NPPES registry since March 28, 2023.
## Identity
- **NPI:** 1437853173 (Entity type: Individual)
- **Enumerated:** March 28, 2023
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** MD494368 (Pennsylvania)
- **Sole proprietor:** No
## Practice location
- **Address:** 3400 SPRUCE ST, Philadelphia, PA 19104-4238
- **Phone:** (215) 662-9990 · **Fax:** (215) 243-3297
## 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:** Main Line Healthcare (NPI 1922077643, Newtown Square, PA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Perelman School Of Med At The University Of Pennsylvania, class of 2023
## Record status
- **NPPES last updated:** June 8, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1437853173) · Data from the CMS NPPES public registry.