Ester Kwok, MD
Internal Medicine Physician · Los Gatos, CA
Ester Kwok, MD is an internal medicine physician with a practice address in Los Gatos, California, and NPI 1790886034, issued on Sep 26, 2006. Check the license (California A050957, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ester Kwok
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A050957 CA
Self-reported in NPPES; status is on the state search - Practice location
- 320 Dardanelli LN Ste 27B, Los Gatos, CA 95032
- Phone
- (408) 374-1112
- Enumerated
- Sep 26, 2006
- Record last updated
- Feb 3, 2025
- Fax
- (408) 374-1133
- Medicare enrollment
- Enrolled (PECOS I20080701000348); accepts Medicare assignment
- Medical or professional school
- University Of Texas Medical School At Houston, 1989
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Ester Kwok in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A050957Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,097 Medicare Part D claims for 348 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Rosuvastatin Calcium317 claims
- Losartan Potassium240 claims
- Amlodipine Besylate231 claims
- Levothyroxine Sodium205 claims
- Atorvastatin Calcium182 claims
- Metformin Hcl Er92 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.
Ester Kwok among 17,696 internal medicine physician records in California
Ester Kwok, MD 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1989 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
47 internal medicine physician records list a practice address in Los Gatos
They are 47 of the 1,905 NPPES records with a practice address in Los Gatos, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Gatos → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mandeep Ayer, M.D.Los Gatos, CA 950321205817111
- Gopi Ayer, M.D.Los Gatos, CA 950321396701512
- Richard Bobis, M.D.Los Gatos, CA 950321407813843
- Edward Brooks, MDLos Gatos, CA 950321831162338
- Andrew Chi, MD MPHLos Gatos, CA 950321700861275
- Jane Chien, MDLos Gatos, CA 950321588620785
- Linda Eglin, MDLos Gatos, CA 950321144223611
- Stacey Hein, INTERNAL MEDICINELos Gatos, CA 950321568429983
Common questions
What is Ester Kwok, MD's NPI number?
Ester Kwok, MD's National Provider Identifier (NPI) is 1790886034, issued on Sep 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ester Kwok, MD located?
The NPPES record lists a practice address at 320 Dardanelli LN Ste 27B, Los Gatos, CA, 95032. Phone: (408) 374-1112. Providers update this record themselves, so call before visiting.
How can I verify Ester Kwok, MD's license?
NPPES lists California license number A050957, 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 Ester Kwok, MD prescribe under Medicare Part D?
In 2024, Ester Kwok, MD had 3,097 Medicare Part D claims for 348 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.