NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Don Cassidy Arnold II, M.D.

Urology Physician in Herrin, IL · enumerated 2008.

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

National Provider Identifier

1457501926

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Don Cassidy Arnold II
Credential M.D.
Sex Male
Practice address 220 S Park Ave Fl 2, Herrin, IL, 62948
Phone (618) 988-6240
Fax (618) 351-4814
Enumeration date Sep 22, 2008
Last updated in NPPES Sep 10, 2021

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 036.131997 (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 Don Arnold?
Don Arnold is registered in NPPES with the primary taxonomy of Urology 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

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-09-10.