Arleen Chang, MD
Internal Medicine Physician · Mountain View, CA
Arleen Chang, MD is an internal medicine physician with a practice address in Mountain View, California, and NPI 1679650501, issued on Oct 31, 2006. Check the license (California A60478, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arleen Chang
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A60478 CA
Self-reported in NPPES; status is on the state search - Practice location
- 555 Castro St, Mountain View, CA 94041
- Phone
- (650) 903-3000
- Enumerated
- Oct 31, 2006
- Record last updated
- Jan 3, 2022
- Medicaid ID
- 00A604780 CA
- Medicare enrollment
- Enrolled (PECOS I20101220000175); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1994
- Entity
- Type 1 · individual
Also registered at 555 Castro St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Arleen Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A60478Check 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% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,005 Medicare Part D claims for 397 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 13 claims were for opioids.
Most prescribed
- Atorvastatin Calcium238 claims
- Amlodipine Besylate219 claims
- Losartan Potassium184 claims
- Levothyroxine Sodium132 claims
- Hydrochlorothiazide118 claims
- Atenolol117 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 IncSanta Clara, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
119 internal medicine physician records list a practice address in Mountain View
They are 119 of the 2,467 NPPES records with a practice address in Mountain View, and 17,696 internal medicine physician records in California.
All 119 in Mountain View → All 17,696 in California → Every provider in Mountain View →
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Common questions
What is Arleen Chang, MD's NPI number?
Arleen Chang, MD's National Provider Identifier (NPI) is 1679650501, issued on Oct 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Arleen Chang, MD located?
The NPPES record lists a practice address at 555 Castro St, Mountain View, CA, 94041. Phone: (650) 903-3000. Providers update this record themselves, so call before visiting.
How can I verify Arleen Chang, MD's license?
NPPES lists California license number A60478, 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 Arleen Chang, MD prescribe under Medicare Part D?
In 2024, Arleen Chang, MD had 3,005 Medicare Part D claims for 397 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.