John Kao, MD
Internal Medicine Physician · Irvine, CA
John Kao, MD is an internal medicine physician with a practice address in Irvine, California, and NPI 1568780468, issued on May 17, 2010. Check the license (California A117555, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Kao
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A117555 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16300 Sand Canyon Ave Ste 311, Irvine, CA 92618
- Phone
- (949) 791-3001
- Enumerated
- May 17, 2010
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (949) 791-3096
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 16300 Sand Canyon Ave Ste 311
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Kao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A117555Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average internal medicine physician in 2024
7,579 Medicare Part D claims for 842 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 548 claims were for opioids.
Most prescribed
- Atorvastatin Calcium550 claims
- Amlodipine Besylate398 claims
- Lisinopril332 claims
- Hydrocodone-Acetaminophen237 claims
- Metformin Hcl229 claims
- Losartan Potassium227 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.
John Kao among 17,696 internal medicine physician records in California
John Kao, 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 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2021 · 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).
155 internal medicine physician records list a practice address in Irvine
They are 155 of the 7,778 NPPES records with a practice address in Irvine, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Irvine → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Savitha Bharadwaj, M.D.Irvine, CA 926181760470926
- Juan Cabrera, M.D.Irvine, CA 926181447254792
- William Chen, M.D.Irvine, CA 926181881659142
- Subrato Ghosh, MDIrvine, CA 926181083607055
- Kambiz Karimi, M.D.Irvine, CA 926181184688475
- Sara Kim, M.D.Irvine, CA 926181912944166
- Brian Lo, MDIrvine, CA 926181073501565
- Emad Mikhail, MDIrvine, CA 926181376582957
Common questions
What is John Kao, MD's NPI number?
John Kao, MD's National Provider Identifier (NPI) is 1568780468, issued on May 17, 2010. An NPI identifies a provider in billing; it is not a license.
Where is John Kao, MD located?
The NPPES record lists a practice address at 16300 Sand Canyon Ave Ste 311, Irvine, CA, 92618. Phone: (949) 791-3001. Providers update this record themselves, so call before visiting.
How can I verify John Kao, MD's license?
NPPES lists California license number A117555, 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 John Kao, MD prescribe under Medicare Part D?
In 2024, John Kao, MD had 7,579 Medicare Part D claims for 842 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.