Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Stephen A. Baker, M.D.

Orthopaedic Surgery Physician in Carol Stream, IL · enumerated 2005.

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

National Provider Identifier

1316948938

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Registry record

Entity type Individual (Type 1)

Name Dr. Stephen A. Baker

Credential M.D.

Sex Male

Practice address 327 Gundersen Dr, Suite A, Carol Stream, IL, 60188

Phone (630) 665-9155

Fax (630) 665-5557

Enumeration date Aug 4, 2005

Last updated in NPPES Feb 18, 2010

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 036060377 (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 Stephen Baker?

Stephen Baker is registered in NPPES with the primary taxonomy of Orthopaedic Surgery 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 2010-02-18.