Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Paul Sun, MD

Surgery Physician in Chicago, IL · enumerated 2019.

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

National Provider Identifier

1023576618

Verified

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Registry record

Entity type Individual (Type 1)

Name Alexander Paul Sun

Credential MD

Sex Male

Practice address 600 S Paulina St Ste 403, Chicago, IL, 60612

Phone (312) 942-7100

Enumeration date Mar 4, 2019

Last updated in NPPES Jul 5, 2019

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 152.074671 (IL) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Alexander Sun?

The National Provider Identifier (NPI) for Alexander Sun is 1023576618, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alexander Sun practice?

The practice location on file with NPPES is in Chicago, IL. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-07-05.