RALPH KOO MD
NPI 1205932050
Emergency Medicine - Emergency Medical Services in Sacramento, CA
About Ralph Koo Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
RALPH KOO MD (NPI 1205932050) is an individual emergency medical services provider in Sacramento, California, licensed in California (GO81031) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS and is a graduate of University Of South Carolina School Of Medicine (1993).
NPPES Registry Identity
Specialties & Licenses
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
Ralph Koo 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
3Medicare enrollment records show Ralph Koo reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Sacramento, CA 95816
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Vacaville, CA 95687
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Northbay Physicians Surgery Center, LLC
- 516 clinicians in this Medicare group
Fremont, CA 94538
- Reassigned Medicare billing, California enrollment
- 103 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 5
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 95816 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.
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 Ralph Koo's NPI number?
The NPI number for Ralph Koo is 1205932050. It was assigned to this individual provider in the NPPES registry on September 16, 2006.
Where is Ralph Koo located?
Ralph Koo practices at 2801 L St, Sacramento, CA 95816. The listed phone number is (916) 454-2222.
What is Ralph Koo's specialty?
The primary specialty registered for this NPI is Emergency Medicine, specializing in Emergency Medical Services, with taxonomy code 207PE0004X.
Is Ralph Koo enrolled in Medicare?
Yes. Ralph Koo 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 Ralph Koo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ralph Koo reassigns Medicare benefits to 3 organizations: Cep America - California (Sacramento, CA), Northbay Healthcare Group (Vacaville, CA) and Emergency Physicians Associates Fremont PC (Fremont, 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 Ralph Koo'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 Ralph Koo was last updated on March 25, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Ralph Koo, MD · NPI 1205932050
Emergency Medical Services physician in Sacramento, California. Individual provider, active in the CMS NPPES registry since September 16, 2006.
## Identity
- **NPI:** 1205932050 (Entity type: Individual)
- **Enumerated:** September 16, 2006
- **Primary specialty:** Emergency Medicine - Emergency Medical Services · taxonomy 207PE0004X
- **State license:** GO81031 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 2801 L ST, Sacramento, CA 95816-5615
- **Phone:** (916) 454-2222
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1306145404, Sacramento, CA); Northbay Healthcare Group (NPI 1255483202, Vacaville, CA); Emergency Physicians Associates Fremont PC (NPI 1790250967, Fremont, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of South Carolina School Of Medicine, class of 1993
## Record status
- **NPPES last updated:** March 25, 2010
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Source: [NPI Profile](https://npiprofile.com/npi/1205932050) · Data from the CMS NPPES public registry.