DR. KARIN LILLY SIGUENZA MD
NPI 1457989394
Emergency Medicine in Whittier, CA
About Dr. Karin Lilly Siguenza Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KARIN LILLY SIGUENZA MD (NPI 1457989394) is an individual emergency medicine provider in Whittier, California, licensed in California (A181013) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of Georgetown University School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Secondary Practice Locations 3
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. Karin Lilly Siguenza 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
4Medicare enrollment records show Karin Siguenza reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Whittier, CA 90602
- Reassigned Medicare billing, California enrollment
- 121 clinicians in this Medicare group
Pico Rivera, CA 90660
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Los Angeles, CA 90033
- Reassigned Medicare billing, California enrollment
- 100 clinicians in this Medicare group
Irvine, CA 92618
- Reassigned Medicare billing, California enrollment
- 684 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90602 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.
WHITTIER, CA 90602
WHITTIER, CA 90602
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 Karin Siguenza's NPI number?
The NPI number for Karin Siguenza is 1457989394. It was assigned to this individual provider in the NPPES registry on March 27, 2020. The provider is also known as Karin Lilly Collins MD.
Where is Karin Siguenza located?
Karin Siguenza practices at 12401 Washington Blvd, Whittier, CA 90602. The listed phone number is (562) 698-0811.
What is Karin Siguenza's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Karin Siguenza enrolled in Medicare?
Yes. Karin Siguenza 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 Karin Siguenza's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karin Siguenza reassigns Medicare benefits to 4 organizations: Intercommunity Emergency Medical Group (Whittier, CA), Southern California Permanente Medical Group (Pico Rivera, CA), Victory Emergency Physicians Medical Group Inc (Los Angeles, CA) and Providence Facey Medical Foundation (Irvine, CA). 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 Karin Siguenza'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 Karin Siguenza was last updated on July 17, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. Karin Lilly Siguenza, MD · NPI 1457989394
Emergency Medicine physician in Whittier, California. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1457989394 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A181013 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 12401 WASHINGTON BLVD, Whittier, CA 90602-1006
- **Phone:** (562) 698-0811
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Intercommunity Emergency Medical Group (NPI 1871535286, Whittier, CA); Southern California Permanente Medical Group (NPI 1891287827, Pico Rivera, CA); Victory Emergency Physicians Medical Group Inc (NPI 1932402716, Los Angeles, CA); Providence Facey Medical Foundation (NPI 1891348447, Irvine, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Georgetown University School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** July 17, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1457989394) · Data from the CMS NPPES public registry.