Derrick Koo, MD
Radiation Oncology Physician · Roseville, CA
Derrick Koo, MD is a radiation oncology physician with a practice address in Roseville, California, and NPI 1902984495, issued on Nov 1, 2006. Check the license (California A86734, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Derrick Koo
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- A86734 CA
Self-reported in NPPES; status is on the state search - Practice location
- 504 Gibson Dr, Roseville, CA 95678
- Phone
- (916) 771-2871
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (916) 771-2841
- Medicaid ID
- 00A867340 CA
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 504 Gibson Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Allan Chen, M.D.Radiation Oncology Physician1174506406
- Shawna Chrisman, NP,RN,MS,ACNPNurse Practitioner1164510970
- Nima Harandi, MDRadiation Oncology Physician1124446307
Verify Derrick Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A86734Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average radiation oncology physician in 2024
82 Medicare Part D claims for 39 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims. 14 claims were for opioids.
Most prescribed
- Terazosin Hcl18 claims
- Dexamethasone11 claims
- Lorazepam11 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.
Derrick Koo among 735 radiation oncology physician records in California
Derrick Koo, MD is one of 735 radiation oncology physician records with a practice address in California. 83% 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 16% of them.
- NPI issued2006 · 16% of these records are older, 55% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in California
There are 735 radiation oncology physician records in California.
All 735 in California → Every provider in Roseville → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Allan Chen, M.D.Roseville, CA 956781174506406
- Nima Harandi, MDRoseville, CA 956781124446307
- Franklin Banker, M.D.Cameron Park, CA 956821841297959
- Meghan MacomberCameron Park, CA 956821720421142
- Rachel Chou, MDRancho Cordova, CA 956701740244094
- Darryl Hunter, MDRancho Cordova, CA 956701538247242
- Nathalie Nguyen, MDRancho Cordova, CA 956701205890498
- Bihai Peng, MDRancho Cordova, CA 956701932287430
Common questions
What is Derrick Koo, MD's NPI number?
Derrick Koo, MD's National Provider Identifier (NPI) is 1902984495, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Derrick Koo, MD located?
The NPPES record lists a practice address at 504 Gibson Dr, Roseville, CA, 95678. Phone: (916) 771-2871. Providers update this record themselves, so call before visiting.
How can I verify Derrick Koo, MD's license?
NPPES lists California license number A86734, 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 Derrick Koo, MD prescribe under Medicare Part D?
In 2024, Derrick Koo, MD had 82 Medicare Part D claims for 39 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.