Andrea H. Chang, DO
Endocrinology, Diabetes & Metabolism Physician · Mercer Island, WA
Andrea H. Chang, DO is an endocrinology, diabetes & metabolism physician with a practice address in Mercer Island, Washington, and NPI 1689065468, issued on Feb 14, 2015. Check the license (Washington OP61199690, as entered in NPPES) on the Washington Medical Commission; the Medicare figures below come from public CMS files.
- Name
- Andrea H. Chang
- Credential
- DO
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- OP61199690 WA
Self-reported in NPPES; status is on the state search - Practice location
- 3236 78TH Ave SE Ste 200, Mercer Island, WA 98040
- Phone
- (206) 386-9500
- Enumerated
- Feb 14, 2015
- Record last updated
- Jul 24, 2026
- Fax
- (206) 386-9605
- Medicaid ID
- 2150949 WA
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 224 in Washington → Look up another NPI →
Also registered at 3236 78TH Ave SE Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Boyon Yun, ARNPFamily Nurse Practitioner1750708269
Verify Andrea H. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWashington Medical Commission
Search for license OP61199690Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
890 Medicare Part D claims for 138 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Atorvastatin Calcium53 claims
- Lisinopril46 claims
- Amlodipine Besylate41 claims
- Levothyroxine Sodium40 claims
- Losartan Potassium37 claims
- Hydrochlorothiazide31 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.
Andrea H. Chang among 224 endocrinology, diabetes & metabolism physician records in Washington
Andrea H. Chang, DO is one of 224 endocrinology, diabetes & metabolism physician records with a practice address in Washington. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 83% of them.
- NPI issued2015 · 83% of these records are older, 15% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Washington practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Washington
There are 224 endocrinology, diabetes & metabolism physician records in Washington.
All 224 in Washington → Every provider in Mercer Island → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Jessica Brzana, MDKirkland, WA 980341013128651
- Lindsay Collins, M.D.Kirkland, WA 980341255606489
- Farideh Eskandari, MDKirkland, WA 980341619993995
- Sonia Hans, M.D.Kirkland, WA 980341821431461
- Misung Kim, M.DKirkland, WA 980341801107271
- Edward La Cava, MDKirkland, WA 980341942239413
- Samer Hafi, M.D.Issaquah, WA 980291144486945
- Jules Aljammal, M.D.Issaquah, WA 980271083846018
Common questions
What is Andrea H. Chang, DO's NPI number?
Andrea H. Chang, DO's National Provider Identifier (NPI) is 1689065468, issued on Feb 14, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Andrea H. Chang, DO located?
The NPPES record lists a practice address at 3236 78TH Ave SE Ste 200, Mercer Island, WA, 98040. Phone: (206) 386-9500. Providers update this record themselves, so call before visiting.
How can I verify Andrea H. Chang, DO's license?
NPPES lists Washington license number OP61199690, as entered by the provider. Search the Washington Medical Commission at https://wahelms.my.site.com/s/license-search. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Andrea H. Chang, DO prescribe under Medicare Part D?
In 2024, Andrea H. Chang, DO had 890 Medicare Part D claims for 138 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.