Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Christian John Den Ouden, M.D.

Emergency Medicine Physician in Oak Lawn, IL · enumerated 2008.

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

National Provider Identifier

1336304518

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Registry record

Entity type Individual (Type 1)

Name Dr. Christian John Den Ouden

Credential M.D.

Sex Male

Practice address 4440 W 95th St, Oak Lawn, IL, 60453

Phone (708) 684-5375

Fax (708) 684-1028

Enumeration date Jul 27, 2008

Last updated in NPPES Sep 13, 2011

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 036128082 (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 specialty is Christian Den Ouden?

Christian Den Ouden is registered in NPPES with the primary taxonomy of Emergency Medicine 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-13.