Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark C Hedetniemi, DPT

Orthopedic Physical Therapist in Millsboro, DE · enumerated 2008 · practices at Dover Vision Centre Ltd.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1780841866

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark C Hedetniemi

Credential DPT

Sex Male

Practice address 232 Mitchell St, Suite 101, Millsboro, DE, 19966

Phone (302) 934-1500

Fax (302) 934-6628

Enumeration date May 17, 2008

Last updated in NPPES May 17, 2008

Taxonomy & licenses

2251X0800X Orthopedic Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License J1-0001757 (DE) Primary

DPT · Doctor of Physical Therapy: A physical therapist holding the clinical doctorate now standard for the profession. About the DPT credential

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 → Validate an NPI →

Frequently asked questions

What specialty is Mark Hedetniemi?

Mark Hedetniemi is registered in NPPES with the primary taxonomy of Orthopedic Physical Therapist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-17.