NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mao H. Chen, M.D.

Internal Medicine Physician in Chicago, IL · enumerated 2006.

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

National Provider Identifier

1295794345

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Registry record

Entity type Individual (Type 1)
Name Mao H. Chen
Credential M.D.
Sex Male
Practice address Chicago, IL, 60634
Phone (773) 258-8090
Fax (773) 481-6542
Enumeration date Mar 18, 2006
Last updated in NPPES Dec 6, 2012

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036051346 (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
036051346 Other IL LICENSE #
036051346 Medicaid IL -
110121944 Other IL RAILROAD MEDICARE PROVIDER #
21607181 Other IL BCBS PROVIDER #

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

Where does Mao Chen practice?
The practice location on file with NPPES is in Chicago, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mao Chen?
The National Provider Identifier (NPI) for Mao Chen is 1295794345, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-06.