Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Joann Cong Yin Chang, M.D.

Ophthalmology Physician in Lancaster, MA · enumerated 2008 · practices at D'Ambrosio Eye Care, Inc..

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

National Provider Identifier

1730359100

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Registry record

Entity type Individual (Type 1)

Name Dr. Joann Cong Yin Chang

Credential M.D.

Sex Female

Practice address 479 Old Union Tpke, Lancaster, MA, 01523

Phone (978) 537-3900

Fax (978) 537-6030

Enumeration date Mar 2, 2008

Last updated in NPPES May 2, 2022

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 267568 (NY) Secondary

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 243192 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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.

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Frequently asked questions

How do I verify Joann Chang's NPI record?

Cross-check NPI 1730359100 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1730359100 active?

Yes, as of the latest NPPES snapshot, NPI 1730359100 is active (record last updated 2022-05-02).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-02.