John Katsis Jr., DDS LTD
John Katsis Jr. is a Orthodontics and Dentofacial Orthopedics Dentistry provider (Dentist) practicing in Bartlett, IL, registered in the NPPES registry with NPI 1861546392 since 2007. Practices at John Katsis D.D.S., Ltd. (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1861546392 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | John Katsis Jr. |
| Credential | DDS LTD |
| Sex | Male |
| Practice address | 110 S OAK AVE, Bartlett, IL, 60103 |
| Phone | 6308305550 |
| Fax | 6308305352 |
| Enumeration date | 2007-01-22 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 1223X0400X | Orthodontics and Dentofacial Orthopedics Dentistry | Primary | 19016097 | IL |
Copy-ready billing details
Provider: John Katsis, DDS LTD NPI: 1861546392 Taxonomy: 1223X0400X (Orthodontics and Dentofacial Orthopedics Dentistry) Address: 110 S OAK AVE, Bartlett, IL, 60103
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1194194639 | John Katsis D.D.S., Ltd. | Organization | Orthodontics and Dentofacial Orthopedics Dentistry | Bartlett, IL |
Verify this record
Cross-check NPI 1861546392 against the authoritative CMS record: view John Katsis Jr. 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2007-07-08.