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

Dr. Xavier W Parreno, M.D.

Internal Medicine Physician in Gurnee, IL · enumerated 2006.

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

National Provider Identifier

1023085479

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Registry record

Entity type Individual (Type 1)

Name Dr. Xavier W Parreno

Credential M.D.

Sex Male

Practice address Gurnee, IL, 60031

Phone (847) 336-2150

Fax (847) 336-2160

Enumeration date Mar 3, 2006

Last updated in NPPES Mar 30, 2017

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 036097735 (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
036097735	Medicaid	IL	-
202117968	Other	IL	TAX ID #
14D1039883	Other	IL	CLIA
K18087	Other	IL	MCR PIN COOK COUNTY
4932456	Other	IL	BCBS
K18088	Other	IL	MCR PIN LAKE COUNTY

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.

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Frequently asked questions

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.

What specialty is Xavier Parreno?

Xavier Parreno is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-03-30.