Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Nicholas Mark Messamer, MD
Family Medicine Physician in Oskaloosa, IA · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649264276
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| IA0101 | Other | IA | JOHN DEERE |
| 7815 | Other | - | MIDLAND CHOICE |
| 0000 | Other | - | TRICARE |
| 080123337 | Other | - | RR MEDICARE |
| 16D0950498 | Other | - | CLIA |
| 5008800001 | Other | - | CMS |
| 46158 | Other | IA | BLUE CROSS BLUE SHIELD |
| 7050880 | 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.
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Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-12-05.