Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Warren Jeffrey Chang, M.D.

Ophthalmology Physician in Bloomington, IN · enumerated 2005.

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

National Provider Identifier

1902888662

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Registry record

Entity type Individual (Type 1)

Name Warren Jeffrey Chang

Credential M.D.

Sex Male

Practice address 1011 W 2nd St, Bloomington, IN, 47403

Phone (812) 334-1213

Fax (812) 333-5039

Enumeration date Nov 17, 2005

Last updated in NPPES Feb 14, 2012

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License IN01052241 (IN) Primary

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

Other identifiers

Identifier	Type	State	Issuer
200257620A	Medicaid	IN	-

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

What specialty is Warren Chang?

Warren Chang is registered in NPPES with the primary taxonomy of Ophthalmology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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Charles Huck Optometrist · Bloomington, IN NPI 1346222320 Integ Health System, P.C. Ophthalmology Physician · Bloomington, IN NPI 1215919105 Steven Holbrook Optometrist · Bloomington, IN NPI 1285616276 Rex Grossman Ophthalmology Physician · Bloomington, IN NPI 1306828322 Integ Health System, P.C. Ambulatory Surgical Clinic/Center · Bloomington, IN NPI 1013999580 Jason Gray Optometrist · Bloomington, IN NPI 1730387283 Andrew Huck Ophthalmology Physician · Bloomington, IN NPI 1346770005

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-14.