Ralph Koo, MD
Emergency Medical Services (Emergency Medicine) Physician · Sacramento, CA
Ralph Koo, MD is an emergency medical services (emergency medicine) physician with a practice address in Sacramento, California, and NPI 1205932050, issued on Sep 16, 2006. Check the license (California GO81031, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph Koo
- Credential
- MD
- Primary taxonomy
- Emergency Medical Services (Emergency Medicine) Physician 207PE0004X
- License number
- GO81031 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2801 L St, Sacramento, CA 95816
- Phone
- (916) 454-2222
- Enumerated
- Sep 16, 2006
- Record last updated
- Mar 25, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20061017000616); accepts Medicare assignment
- Medical or professional school
- University Of South Carolina School Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest emergency medical services (emergency medicine) physician records → All 233 in California → Look up another NPI →
Also registered at 2801 L St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christopher Banks, PA-CPhysician Assistant1457796427
- Stephanie Bareis, PA-CSurgical Physician Assistant1033362645
- Leland Bourdon, M.D.Emergency Medicine Physician1891038709
- Andrea Campisi, RN, MSN, CNORRegistered Nurse1881813525
- Laura Cataldo, PA-CPhysician Assistant1447582119
- Eileen Chu, MDEmergency Medicine Physician1306166798
Verify Ralph Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license GO81031Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average emergency medical services (emergency medicine) physician in 2024
244 Medicare Part D claims for 138 beneficiaries, against an average of 292 among the 1,653 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Morphine Sulfate31 claims
- Ondansetron Odt26 claims
- Cephalexin17 claims
- Albuterol Sulfate Hfa16 claims
- Nitrofurantoin Mono-Macro13 claims
- Prednisone12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Cep America - CaliforniaFrench Camp, CA
- Northbay Physicians Surgery Center, LLCFairfield, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ralph Koo among 233 emergency medical services (emergency medicine) physician records in California
Ralph Koo, MD is one of 233 emergency medical services (emergency medicine) physician records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 50% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 42% of these records are
- Graduated1993 · median 2002 among the 99 with a school on file
- Record last updated2010 · 68% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207PE0004X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medical Services (Emergency Medicine) Physician providers in California
There are 233 emergency medical services (emergency medicine) physician records in California.
All 233 in California → Every provider in Sacramento → Emergency Medical Services (Emergency Medicine) Physician nationwide →
The 8 emergency medical services (emergency medicine) physician records with the nearest ZIP codes
- Duncan JohnstonSacramento, CA 958171669770574
- Jessica Wiser, M.D.Sacramento, CA 958171245493808
- Usama Khan, MDSacramento, CA 958231982353702
- Emmanuel RutazihanaWoodland, CA 957761538741103
- Jaskaranpreet Sahota, FNPMarysville, CA 959011407497837
- Alan Stesin, M.D.Chico, CA 959261346369709
- John Taylor, M.D.Cameron Park, CA 956821477540896
- Douglas Fischer, NPOroville, CA 959661750893640
Common questions
What is Ralph Koo, MD's NPI number?
Ralph Koo, MD's National Provider Identifier (NPI) is 1205932050, issued on Sep 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph Koo, MD located?
The NPPES record lists a practice address at 2801 L St, Sacramento, CA, 95816. Phone: (916) 454-2222. Providers update this record themselves, so call before visiting.
How can I verify Ralph Koo, MD's license?
NPPES lists California license number GO81031, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ralph Koo, MD prescribe under Medicare Part D?
In 2024, Ralph Koo, MD had 244 Medicare Part D claims for 138 beneficiaries; the average among emergency medical services (emergency medicine) physician prescribers was 292. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.