Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. George Michael Neff, OD
Optometrist in Marshalltown, IA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1114931680
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Registry record
Entity type Individual (Type 1)
Name Dr. George Michael Neff
Credential OD
Sex Male
Practice address 116 W Main St, Marshalltown, IA, 50158
Phone (641) 753-5042
Fax (641) 753-5292
Enumeration date Jul 28, 2006
Last updated in NPPES Oct 21, 2008
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 2088443 | Medicaid | IA | - |
| 08844 | Other | IA | WELLMARK BCBS |
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.
Frequently asked questions
What specialty is George Neff?
George Neff is registered in NPPES with the primary taxonomy of Optometrist. 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 2008-10-21.