Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Byron D Starr, MD

Internal Medicine Physician in Chicago, IL · enumerated 2005 · practices at Northwestern Medical Faculty Foundation.

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

National Provider Identifier

1427041946

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Registry record

Entity type Individual (Type 1)

Name Dr. Byron D Starr

Credential MD

Sex Male

Practice address 259 E Erie St, Ste 2230, Chicago, IL, 60611

Phone (312) 926-6000

Fax (312) 926-8267

Enumeration date Aug 30, 2005

Last updated in NPPES May 16, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036048359 (IL) 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
036048359	Medicaid	IL	-

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

How do I verify Byron Starr's NPI record?

Cross-check NPI 1427041946 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1427041946 active?

Yes, as of the latest NPPES snapshot, NPI 1427041946 is active (record last updated 2016-05-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-05-16.