NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William R Neff, M. D.

Diagnostic Radiology Physician in Cedar Rapids, IA · enumerated 2005.

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

National Provider Identifier

1477550366

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name William R Neff
Credential M. D.
Sex Male
Practice address 1948 1st Ave Ne, Cedar Rapids, IA, 52402
Phone (319) 364-0121
Fax (319) 364-5684
Enumeration date Jul 7, 2005
Last updated in NPPES Aug 17, 2011

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 20732 (IA) 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
300095471 Medicaid IA -

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 is the NPI number for William Neff?
The National Provider Identifier (NPI) for William Neff is 1477550366, a Type 1 (individual) record in the CMS NPPES registry.
Where does William Neff practice?
The practice location on file with NPPES is in Cedar Rapids, IA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-17.