Caroline Koo, MD
Physical Medicine & Rehabilitation Physician · Union City, CA
Caroline Koo, MD is a physical medicine & rehabilitation physician with a practice address in Union City, California, and NPI 1093917254, issued on Jun 1, 2007. Check the license on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Caroline Koo
- Credential
- MD
- Primary taxonomy
- Physical Medicine & Rehabilitation Physician 208100000X
- License number
- 0563 NH
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple RD FL 2, Union City, CA 94587
- Phone
- (510) 675-3070
- Enumerated
- Jun 1, 2007
- Record last updated
- May 13, 2024
- Entity
- Type 1 · individual
8 nearest physical medicine & rehabilitation physician records → All 1,549 in California → Look up another NPI →
Also registered at 3553 Whipple RD FL 2
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ryan Ferguson, DOPain Medicine (Physical Medicine & Rehabilitation) Physician1487116000
- Anhthi Luong, AU.D.Audiologist1700409273
- Emerson Miller, AU.D.Audiologist1144109695
Verify Caroline Koo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of CaliforniaCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average physical medicine & rehabilitation physician in 2024
29 Medicare Part D claims for 17 beneficiaries, against an average of 727 among the 7,448 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Tizanidine Hcl13 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.
Caroline Koo among 1,549 physical medicine & rehabilitation physician records in California
Caroline Koo, MD is one of 1,549 physical medicine & rehabilitation physician records with a practice address in California. 59% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 30% of them.
- NPI issued2007 · 30% of these records are older, 59% newer
- In a Medicare fileYes · 59% of these records are
- In the CMS Doctors and Clinicians fileNo · 51% of these records are
- Record last updated2024 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208100000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Physical Medicine & Rehabilitation Physician providers in California
There are 1,549 physical medicine & rehabilitation physician records in California.
All 1,549 in California → Every provider in Union City → Physical Medicine & Rehabilitation Physician nationwide →
The 8 physical medicine & rehabilitation physician records with the nearest ZIP codes
- Sangmin Ahn, M.D.Union City, CA 945871073892477
- Vidya Hemmad, PTUnion City, CA 945871629249289
- Binh Luu, M.D.Union City, CA 945871295904092
- Laura Nahm, MDUnion City, CA 945871275824757
- Jordan Shilling, PT, DPTUnion City, CA 945871962930313
- Kevin Zheng, MDUnion City, CA 945871649731951
- Brian ZieglerUnion City, CA 945871285181008
- Garth Greenwell, D.O.Pleasanton, CA 945881578676789
Common questions
What is Caroline Koo, MD's NPI number?
Caroline Koo, MD's National Provider Identifier (NPI) is 1093917254, issued on Jun 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Caroline Koo, MD located?
The NPPES record lists a practice address at 3553 Whipple RD FL 2, Union City, CA, 94587. Phone: (510) 675-3070. Providers update this record themselves, so call before visiting.
How can I verify Caroline Koo, MD's license?
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 Caroline Koo, MD prescribe under Medicare Part D?
In 2024, Caroline Koo, MD had 29 Medicare Part D claims for 17 beneficiaries; the average among physical medicine & rehabilitation physician prescribers was 727. 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.