SEAN SPENCER LONDON MD
NPI 1043650443
Radiology - Body Imaging in Northridge, CA
About Sean Spencer London Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SEAN SPENCER LONDON MD (NPI 1043650443) is an individual body imaging provider in Northridge, California, licensed in California (161034) and active in the NPI registry since June 2013. He is enrolled in Medicare PECOS, is affiliated with Marshfield Medical Center - Rice Lake, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 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
Sean Spencer London Md 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
6Medicare enrollment records show Sean London reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Northridge, CA 91325
- Reassigned Medicare billing, California enrollment
- 224 clinicians in this Medicare group
Riverside, CA 92503
- Reassigned Medicare billing, California enrollment
- 67 clinicians in this Medicare group
Marshfield, WI 54449
- Reassigned Medicare billing, California enrollment
- 15 clinicians in this Medicare group
Greenfield, WI 53220
- Reassigned Medicare billing, California enrollment
Greenfield, WI 53220
- Reassigned Medicare billing, California enrollment
- 2 clinicians in this Medicare group
Chicago, IL 60611
- Reassigned Medicare billing, California enrollment
- 16 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 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Marshfield Medical Center - Rice Lake
Acute Care Hospitals · Rice Lake, WIMarshfield Medical Center - Beaver Dam (mmc-Bd)
Acute Care Hospitals · Beaver Dam, WIAscension SE Wisconsin Hospital
Acute Care Hospitals · Milwaukee, WIMarshfield Medical Center - Minocqua
Acute Care Hospitals · Minocqua, WIOther Providers at the Same Location NPPES 17
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
NORTHRIDGE, CA 91325
NORTHRIDGE, CA 91325
NORTHRIDGE, CA 91325
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 Sean London's NPI number?
The NPI number for Sean London is 1043650443. It was assigned to this individual provider in the NPPES registry on June 28, 2013.
Where is Sean London located?
Sean London practices at 18436 Roscoe Blvd, Northridge, CA 91325. The listed phone number is (818) 435-1400.
What is Sean London's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Body Imaging, with taxonomy code 2085B0100X.
Is Sean London enrolled in Medicare?
Yes. Sean London 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 Sean London's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sean London reassigns Medicare benefits to 6 organizations: Renaissance Imaging Medical Associates, Inc. (Northridge, CA), Health Diagnostics Of California A Professional Corporation (Riverside, CA), Marshfield Clinic Inc (Marshfield, WI), Medical Diagnostic Imaging LLC (Greenfield, WI), Milwaukee Radiologists Ltd (Greenfield, WI) and 1 more organization, listed in the Medicare section above. 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 Sean London's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Sean London affiliated with any hospitals?
According to CMS data, Sean London is affiliated with Marshfield Medical Center - Rice Lake, Marshfield Medical Center - Beaver Dam (mmc-Bd), Ascension SE Wisconsin Hospital and Marshfield Medical Center - Minocqua.
When was this NPI record last updated?
The NPPES record for Sean London was last updated on November 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Sean Spencer London, MD · NPI 1043650443
Body Imaging physician in Northridge, California. Individual provider, active in the CMS NPPES registry since June 28, 2013.
## Identity
- **NPI:** 1043650443 (Entity type: Individual)
- **Enumerated:** June 28, 2013
- **Primary specialty:** Radiology - Body Imaging · taxonomy 2085B0100X
- **State license:** 161034 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 18436 ROSCOE BLVD, Northridge, CA 91325-4107
- **Phone:** (818) 435-1400
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Renaissance Imaging Medical Associates, Inc. (NPI 1487608931, Northridge, CA); Health Diagnostics Of California A Professional Corporation (NPI 1407487531, Riverside, CA); Marshfield Clinic Inc (NPI 1952347981, Marshfield, WI); Medical Diagnostic Imaging LLC (NPI 1427165331, Greenfield, WI); Milwaukee Radiologists Ltd (NPI 1568564904, Greenfield, WI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** November 12, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1043650443) · Data from the CMS NPPES public registry.