Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Dara Grennan

Infectious Disease Physician in Dixon, IL · enumerated 2010.

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

National Provider Identifier

1518282938

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Registry record

Entity type Individual (Type 1)

Name Dr. Dara Grennan

Sex Female

Practice address 403 E 1st St, Dixon, IL, 61021

Phone (815) 285-5629

Fax (815) 285-5634

Enumeration date Mar 29, 2010

Last updated in NPPES Apr 26, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 036-137502 (IL) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 8153445 (UT) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 36.137502 (IL) Secondary

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 036-137502 (IL) Primary

Other identifiers

Identifier	Type	State	Issuer
F400440732	Other	IL	MEDICARE PTAN
036137502	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 Dara Grennan?

Dara Grennan is registered in NPPES with the primary taxonomy of Infectious Disease 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.

Other providers at this practice address

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Katherine Shaw Bethea Hospital General Acute Care Hospital · Dixon, IL NPI 1427043546 Katherine Shaw Bethea Hospital Psychiatric Hospital Unit · Dixon, IL NPI 1023003720 Katherine Shaw Bethea Hospital-Snu Rehabilitation Hospital Unit · Dixon, IL NPI 1447245147 Katherine Shaw Bethea Hospital Personal Emergency Response Attendant · Dixon, IL NPI 1770578395 Katherine Shaw Bethea Hospital-Dme General Acute Care Hospital · Dixon, IL NPI 1831185156 Stanislaw Rewerski Hospitalist Physician · Dixon, IL NPI 1831188317 Katherine Shaw Bethea Hospital Home Health Agency · Dixon, IL NPI 1811987134 James Gallant Family Medicine Physician · Dixon, IL NPI 1295712974

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-26.