Dr. John C Gengo, DDS
Dr. John C Gengo is a General Practice Dentistry provider (Dentist) practicing in Olean, NY, registered in the NPPES registry with NPI 1023102506 since 2006. The credential DDS stands for Doctor of Dental Surgery.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1023102506 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. John C Gengo |
| Credential | DDS |
| Sex | Male |
| Practice address | Olean, NY, 14760 |
| Phone | 7163728970 |
| Enumeration date | 2006-10-02 |
| Last updated in NPPES | 2007-07-08 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1223G0001X | General Practice Dentistry | Primary | 042407 | NY |
DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential
Copy-ready billing details
Provider: John Gengo, DDS NPI: 1023102506 Taxonomy: 1223G0001X (General Practice Dentistry) Address: Olean, NY, 14760
Verify this record
Cross-check NPI 1023102506 against the authoritative CMS record: view Dr. John C Gengo on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.