John O. Lai, M.D.
Internal Medicine Physician · Daly City, CA
John O. Lai, M.D. is an internal medicine physician with a practice address in Daly City, California, and NPI 1457398406, issued on May 31, 2006. Check the license (California G78359, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John O. Lai
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G78359 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1500 Southgate Ave, Daly City, CA 94015
- Phone
- (650) 991-4463
- Enumerated
- May 31, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G783590 CA
- Medicare enrollment
- Enrolled (PECOS I20051013001046); accepts Medicare assignment
- Medical or professional school
- University Of Kansas School Of Med (Kc/Wich/Sal), 1992
- 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 1500 Southgate Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John O. Lai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G78359Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.4 times the Medicare Part D claims of the average internal medicine physician in 2024
17,014 Medicare Part D claims for 1,136 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 315 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,292 claims
- Amlodipine Besylate1,162 claims
- Metformin Hcl706 claims
- Losartan Potassium675 claims
- Levothyroxine Sodium394 claims
- Lisinopril393 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.
Industry payments in 2024: $5,454.00
218 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- John Lai And Kevin Wong Medical CorporationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John O. Lai among 17,696 internal medicine physician records in California
John O. Lai, 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 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
- Graduated1992 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 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).
56 internal medicine physician records list a practice address in Daly City
They are 56 of the 1,606 NPPES records with a practice address in Daly City, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Daly City → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kenneth Chuang, M.D.Daly City, CA 940151568492445
- Jesus Roland Gatpolintan, M.D.Daly City, CA 940151720064488
- Daniel Hwang, M.D.Daly City, CA 940151871683532
- Damon Lee, MDDaly City, CA 940151922095256
- Shu May Lee, M.D.Daly City, CA 940151689614992
- Karl Lee, M.D.Daly City, CA 940151093746703
- Michael McNamara, M.D.Daly City, CA 940151235220658
- Richard Moskowitz, MDDaly City, CA 940151124102868
Common questions
What is John O. Lai, M.D.'s NPI number?
John O. Lai, M.D.'s National Provider Identifier (NPI) is 1457398406, issued on May 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John O. Lai, M.D. located?
The NPPES record lists a practice address at 1500 Southgate Ave, Daly City, CA, 94015. Phone: (650) 991-4463. Providers update this record themselves, so call before visiting.
How can I verify John O. Lai, M.D.'s license?
NPPES lists California license number G78359, 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 O. Lai, M.D. prescribe under Medicare Part D?
In 2024, John O. Lai, M.D. had 17,014 Medicare Part D claims for 1,136 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.