Dr. John Karl Holzinger, DMD
Dr. John Karl Holzinger is a Dentist provider (Dentist) practicing in Middletown, CT, registered in the NPPES registry with NPI 1508976374 since 2006. The credential DMD stands for Doctor of Medicine in Dentistry. Practices at Hoff Consulting LLC (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1508976374 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. John Karl Holzinger |
| Credential | DMD |
| Sex | Male |
| Practice address | 770 SAYBROOK RD, Middletown, CT, 06457 |
| Phone | 8603478457 |
| Fax | 8603474393 |
| Enumeration date | 2006-08-30 |
| Last updated in NPPES | 2007-07-08 |
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 122300000X | Dentist | Primary | 05923 | CT |
DMD — Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD credential
Copy-ready billing details
Provider: John Holzinger, DMD NPI: 1508976374 Taxonomy: 122300000X (Dentist) Address: 770 SAYBROOK RD, Middletown, CT, 06457
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1245213487 | Candice Weigle-Spier | Individual | Psychologist | Middletown, CT |
| 1346225273 | Karen Gresham | Individual | Marriage & Family Therapist | Middletown, CT |
| 1154307668 | Eileen Shekosky | Individual | Clinical Social Worker | Middletown, CT |
| 1235190547 | Yetta Lautenschlager | Individual | Clinical Social Worker | Middletown, CT |
| 1669494928 | Russell Harrington | Individual | Clinical Social Worker | Middletown, CT |
| 1790890770 | Deena Robbins | Individual | Clinical Psychologist | Middletown, CT |
| 1518165232 | Lisa Karabelnik | Individual | Child & Adolescent Psychiatry Physician | Middletown, CT |
| 1114101706 | Robert Reynolds | Individual | Clinical Psychologist | Middletown, CT |
Verify this record
Cross-check NPI 1508976374 against the authoritative CMS record: view Dr. John Karl Holzinger 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.