Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Wai Yin Teresa Chang

Optometrist in Hagerstown, MD · enumerated 2019.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1104478445

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Registry record

Entity type Individual (Type 1)

Name Wai Yin Teresa Chang

Sex Female

Practice address 1725 Dual Hwy # B, Hagerstown, MD, 21740

Phone (301) 739-6573

Enumeration date Jul 16, 2019

Last updated in NPPES May 1, 2025

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 2695 (MD) Primary

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1104478445 active?

Yes, as of the latest NPPES snapshot, NPI 1104478445 is active (record last updated 2025-05-01).

How do I verify Wai Yin Chang's NPI record?

Cross-check NPI 1104478445 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-05-01.