Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Duane L Mast
Family Medicine Physician in Greenfield, OH · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1710938170
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Registry record
Taxonomy & licenses
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 000000316737 | Other | OH | BCBS FOR MADISON |
| MA4121723 | Other | - | MEDICARE PIN HOCKING |
| P00063123 | Other | - | MEDICARE RR HOCKING |
| P00088186 | Other | - | RAILROAD MEDICARE |
| 000000341542 | Other | - | BCBS CIRCLEVILLE |
| 0701100 | Medicaid | OH | - |
| 000000316738 | Other | - | BCBS MADISON |
| 000000315926 | Other | - | BCBS |
| 000000319614 | Other | - | BLUE CROSS BLUE SHIELD |
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 2011-12-06.