Dr. Mark Henry Harder, OD
Dr. Mark Henry Harder is a Optometrist provider (Optometrist) practicing in Modesto, CA, registered in the NPPES registry with NPI 1093787459 since 2006. The credential OD stands for Doctor of Optometry. Practices at Mark H. Harder Od (listed at the same practice address in NPPES).
✓ Active NPI ✓ Valid NPI checksum Sole proprietor
| NPI | 1093787459 |
|---|---|
| Entity type | Individual (Type 1) |
| Name | Dr. Mark Henry Harder |
| Credential | OD |
| Sex | Male |
| Practice address | Modesto, CA, 95350 |
| Phone | 2095964360 |
| Fax | 2095660685 |
| Enumeration date | 2006-02-01 |
| Last updated in NPPES | 2023-03-07 |
Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.
Taxonomy & licenses
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 152W00000X | Optometrist | Primary | CA07481T | CA |
OD — Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| SD0074810 | Medicaid | CA | — |
| 1093787459 | Medicaid | CA | — |
Copy-ready billing details
Provider: Mark Harder, OD NPI: 1093787459 Taxonomy: 152W00000X (Optometrist) Address: Modesto, CA, 95350
Other providers at this practice address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1093955965 | Mark H. Harder Od | Organization | Optometrist | Modesto, CA |
Verify this record
Cross-check NPI 1093787459 against the authoritative CMS record: view Dr. Mark Henry Harder 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
Where does Mark Harder practice?
What is the NPI number for Mark Harder?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2023-03-07.