Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

David A Nellessen, M.D.

Specialist in Arlington Heights, IL · enumerated 2006.

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

National Provider Identifier

1306934278

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Registry record

Entity type Individual (Type 1)

Name David A Nellessen

Credential M.D.

Sex Male

Practice address 2101 S Arlington Heights Rd, #108, Arlington Heights, IL, 60005

Phone (847) 439-4343

Fax (847) 439-4510

Enumeration date Oct 10, 2006

Last updated in NPPES Jan 11, 2011

Taxonomy & licenses

174400000X Specialist Other Service Providers · License 036-071727 (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
036-071727	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

What specialty is David Nellessen?

David Nellessen is registered in NPPES with the primary taxonomy of Specialist. 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 2011-01-11.