Elizabeth Ko, M.D.
Internal Medicine Physician · Los Angeles, CA
Elizabeth Ko, M.D. is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1801189048, issued on May 20, 2011. Check the license (California A131980, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Elizabeth Ko
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A131980 CA
Self-reported in NPPES; status is on the state search - Practice location
- 11303 W Washington Blvd, Los Angeles, CA 90066
- Phone
- (310) 391-7281
- Enumerated
- May 20, 2011
- Record last updated
- Jun 1, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (310) 301-8751
- Medicare enrollment
- Enrolled (PECOS I20150810002913); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 11303 W Washington Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Elizabeth Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A131980Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,952 Medicare Part D claims for 352 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 88 claims were for opioids.
Most prescribed
- Atorvastatin Calcium264 claims
- Amlodipine Besylate167 claims
- Levothyroxine Sodium146 claims
- Lisinopril100 claims
- Losartan Potassium99 claims
- Rosuvastatin Calcium84 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 one group practice
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Elizabeth Ko among 17,696 internal medicine physician records in California
Elizabeth Ko, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 66% of them.
- NPI issued2011 · 66% of these records are older, 32% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2011 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Matthew Herrmann, MDLos Angeles, CA 900661760918551
- Justine Korolyov, M.D.Los Angeles, CA 900661124461736
- Ricky Onofre-Vasquez, M.D.Los Angeles, CA 900661750353892
- Dimitra PapaspyridiLos Angeles, CA 900661538574462
Common questions
What is Elizabeth Ko, M.D.'s NPI number?
Elizabeth Ko, M.D.'s National Provider Identifier (NPI) is 1801189048, issued on May 20, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Elizabeth Ko, M.D. located?
The NPPES record lists a practice address at 11303 W Washington Blvd, Los Angeles, CA, 90066. Phone: (310) 391-7281. Providers update this record themselves, so call before visiting.
How can I verify Elizabeth Ko, M.D.'s license?
NPPES lists California license number A131980, 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 Elizabeth Ko, M.D. prescribe under Medicare Part D?
In 2024, Elizabeth Ko, M.D. had 2,952 Medicare Part D claims for 352 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.