Yinchong Erica Mak, MD
Internal Medicine Physician · Palo Alto, CA
Yinchong Erica Mak, MD is an internal medicine physician with a practice address in Palo Alto, California, and NPI 1982930491, issued on Oct 19, 2009. Check the license (California A114561, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Yinchong Erica Mak
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A114561 CA
Self-reported in NPPES; status is on the state search - Practice location
- 795 EL Camino Real, Palo Alto, CA 94040
- Phone
- (650) 321-4121
- Enumerated
- Oct 19, 2009
- Record last updated
- Jun 4, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20121018000809); accepts Medicare assignment
- Medical or professional school
- University Of Pittsburgh School Of Medicine, 2009
- 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 795 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Yinchong Erica Mak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114561Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
22% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,475 Medicare Part D claims for 289 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 48 claims were for opioids.
Most prescribed
- Atorvastatin Calcium267 claims
- Amlodipine Besylate193 claims
- Levothyroxine Sodium115 claims
- Losartan Potassium112 claims
- Gabapentin82 claims
- Simvastatin59 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
- Sutter Bay Medical FoundationFremont, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Yinchong Erica Mak among 17,696 internal medicine physician records in California
Yinchong Erica Mak, 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 2009, is newer than 60% of them.
- NPI issued2009 · 60% of these records are older, 37% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2004 among the 11,065 with a school on file
- Record last updated2020 · 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).
187 internal medicine physician records list a practice address in Palo Alto
They are 187 of the 7,617 NPPES records with a practice address in Palo Alto, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Palo Alto → Internal Medicine Physician nationwide →
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Common questions
What is Yinchong Erica Mak, MD's NPI number?
Yinchong Erica Mak, MD's National Provider Identifier (NPI) is 1982930491, issued on Oct 19, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Yinchong Erica Mak, MD located?
The NPPES record lists a practice address at 795 EL Camino Real, Palo Alto, CA, 94040. Phone: (650) 321-4121. Providers update this record themselves, so call before visiting.
How can I verify Yinchong Erica Mak, MD's license?
NPPES lists California license number A114561, 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 Yinchong Erica Mak, MD prescribe under Medicare Part D?
In 2024, Yinchong Erica Mak, MD had 2,475 Medicare Part D claims for 289 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.