ANDREA H CHANG DO - NPI 1689065468 - Internal Medicine in Mercer Island, WA

Q: What is Andrea Chang's NPI number?

The NPI number for Andrea Chang is 1689065468. It was assigned to this individual provider in the NPPES registry on February 14, 2015.

Q: What is Andrea Chang's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.

Q: When was this NPI record last updated?

The NPPES record for Andrea Chang was last updated on July 24, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

On this page

About Andrea H Chang Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ANDREA H CHANG DO (NPI 1689065468) is an individual endocrinology, diabetes & metabolism provider in Mercer Island, Washington, licensed in Washington (OP61199690) and active in the NPI registry since February 2015. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1689065468

Entity TypeIndividualFemale

Primary Taxonomy207RE0101X

Provider Legal NameANDREA H CHANGCredential: DO

Location Address3236 78TH AVE SE STE 200Mercer Island, WA 98040-3500

Mailing AddressPo Box 25608Salt Lake City, UT 84125-0608 · (206) 320-4476 · Fax (206) 568-7043

Phone(206) 386-9500

Fax(206) 386-9605

Sole ProprietorNo

Enumeration DateFebruary 14, 2015

Last NPPES UpdateJuly 24, 20266 updates tracked since enumeration

NPPES CertifiedJuly 24, 2026

✔ NPI 1689065468 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Endocrinology, Diabetes & MetabolismAllopathic & Osteopathic Physicians

Taxonomy Code207RE0101X

License✔ Licensed in WA · OP61199690

Definition

An internist who concentrates on disorders of the internal (endocrine) glands such as the thyroid and adrenal glands. This specialist also deals with disorders such as diabetes, metabolic and nutritional disorders, obesity, pituitary diseases and menstrual and sexual problems.

Also ListedInternal MedicineTaxonomy 207R00000X · License OP61199690 (WA)

3236 78TH AVE SE STE 200, Mercer Island, WA 98040

Open in Google Maps ↗

Other Identifiers 1

Medicaid2150949WA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Andrea H Chang Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 98040 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$143.76 typical visit price

range $63.67 – $189.37

Typical copayment $35.94 (range $15.91 – $47.34)

Most-billed visit code 99204

Established Patient

$111.00 typical visit price

range $21.12 – $155.00

Typical copayment $27.75 (range $5.28 – $38.75)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

STEPHEN LOUIS WALSTON MD

Internal Medicine