Dr. Mark J. Holzer, DDS, RPH
Dr. Mark J. Holzer is a General Practice Dentistry provider (Dentist) practicing in Niles, IL, registered in the NPPES registry with NPI 1396893764 since 2007. The credential DDS stands for Doctor of Dental Surgery.
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1396893764 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark J. Holzer |
| Credential | DDS, RPH |
| Sex | Male |
| Practice address | Niles, IL, 60714 |
| Phone | 8472985885 |
| Fax | 8472982938 |
| Enumeration date | 2007-01-08 |
| Last updated in NPPES | 2016-02-25 |
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 | 019-021131 | IL |
| 183500000X | Pharmacist | Secondary | 051-039887 | IL |
DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential
Copy-ready billing details
Provider: Mark Holzer, DDS, RPH NPI: 1396893764 Taxonomy: 1223G0001X (General Practice Dentistry) Address: Niles, IL, 60714
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1780657825 | Melvin Katz | Individual | Orthopaedic Surgery Physician | Niles, IL |
| 1942264890 | Ira Dolnick | Individual | General Practice Dentistry | Niles, IL |
| 1730147042 | Anne Montague | Individual | Clinical Psychologist | Niles, IL |
| 1710935473 | Jileen Murchie | Individual | Professional Counselor | Niles, IL |
| 1780632448 | Lynn Rodgers | Individual | Marriage & Family Therapist | Niles, IL |
| 1992730725 | John Oh | Individual | Internal Medicine Physician | Niles, IL |
| 1255346631 | Drs. Katz and Dolnick, P.C. | Organization | General Practice Dentistry | Niles, IL |
| 1104932136 | Kyung Kim | Individual | Allergy & Immunology Physician | Niles, IL |
Verify this record
Cross-check NPI 1396893764 against the authoritative CMS record: view Dr. Mark J. Holzer 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 2016-02-25.