GUISELLE CLARK M.D.
NPI 1124254024
Hospitalist in Santa Monica, CA
About Guiselle Clark M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GUISELLE CLARK M.D. (NPI 1124254024) is an individual hospitalist provider in Santa Monica, California, licensed in California (A114924) and active in the NPI registry since June 2009. She is enrolled in Medicare PECOS and is a graduate of University Of Iowa, Rj & L Carver College Of Medicine (2009).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 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
Guiselle Clark 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 Guiselle Clark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90034
- Reassigned Medicare billing, California enrollment
- 13,921 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 90404 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 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Guiselle Clark's NPI number?
The NPI number for Guiselle Clark is 1124254024. It was assigned to this individual provider in the NPPES registry on June 5, 2009.
Where is Guiselle Clark located?
Guiselle Clark practices at 1225 15th St A454, Santa Monica, CA 90404. The listed phone number is (310) 319-4598.
What is Guiselle Clark's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Guiselle Clark enrolled in Medicare?
Yes. Guiselle Clark 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 Guiselle Clark's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Guiselle Clark reassigns Medicare benefits to Southern California Permanente Medical Group (Los Angeles, CA). 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 Guiselle Clark'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 Guiselle Clark was last updated on November 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Guiselle Clark, M.D. · NPI 1124254024
Hospitalist physician in Santa Monica, California. Individual provider, active in the CMS NPPES registry since June 5, 2009.
## Identity
- **NPI:** 1124254024 (Entity type: Individual)
- **Enumerated:** June 5, 2009
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **State license:** A114924 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1225 15TH ST, A454, Santa Monica, CA 90404-1101
- **Phone:** (310) 319-4598 · **Fax:** (310) 319-4908
## 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:** Southern California Permanente Medical Group (NPI 1043242563, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Iowa, Rj & L Carver College Of Medicine, class of 2009
## Record status
- **NPPES last updated:** November 30, 2021
- **Other identifiers:** Other 1124254024 (CA); Medicaid 1124254024 (CA)
---
Source: [NPI Profile](https://npiprofile.com/npi/1124254024) · Data from the CMS NPPES public registry.