Andrea Chai, MD
Internal Medicine Physician · Oakland, CA
Andrea Chai, MD is an internal medicine physician with a practice address in Oakland, California, and NPI 1285175448, issued on Mar 20, 2017. Check the license (California A158966, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Andrea Chai
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A158966 CA
Self-reported in NPPES; status is on the state search - Practice location
- 275 W Macarthur Blvd, Oakland, CA 94611
- Phone
- (510) 752-6126
- Enumerated
- Mar 20, 2017
- Record last updated
- Sep 1, 2022
- Medicare enrollment
- Enrolled (PECOS I20210409001807); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 2017
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 275 W Macarthur Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Andrea Chai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A158966Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,874 Medicare Part D claims for 535 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. 150 claims were for opioids.
Most prescribed
- Atorvastatin Calcium274 claims
- Amlodipine Besylate149 claims
- Lisinopril96 claims
- Gabapentin94 claims
- Levothyroxine Sodium92 claims
- Losartan Potassium87 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
- Permanente Medical Group IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Andrea Chai among 17,696 internal medicine physician records in California
Andrea Chai, 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 2017, is newer than 81% of them.
- NPI issued2017 · 81% of these records are older, 16% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2017 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 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).
432 internal medicine physician records list a practice address in Oakland
They are 432 of the 18,558 NPPES records with a practice address in Oakland, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Oakland → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Thomas Baudendistel, MDOakland, CA 946111801820436
- Rachel Canning, MDOakland, CA 946111386657609
- Howard Chang, MDOakland, CA 946111700845336
- Roopal Desai, MDOakland, CA 946111699861484
- Matthew Frankel, M.D., M.B.AOakland, CA 946111568542405
- Thomas Hackford, M.D.Oakland, CA 946111972598639
- Jacqueline Kiang, MDOakland, CA 946111376506600
- Katherine McLane, MDOakland, CA 946111447270186
Common questions
What is Andrea Chai, MD's NPI number?
Andrea Chai, MD's National Provider Identifier (NPI) is 1285175448, issued on Mar 20, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Andrea Chai, MD located?
The NPPES record lists a practice address at 275 W Macarthur Blvd, Oakland, CA, 94611. Phone: (510) 752-6126. Providers update this record themselves, so call before visiting.
How can I verify Andrea Chai, MD's license?
NPPES lists California license number A158966, 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 Andrea Chai, MD prescribe under Medicare Part D?
In 2024, Andrea Chai, MD had 2,874 Medicare Part D claims for 535 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.