Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark A Klaassen, MD

Individual provider Orthopaedic Surgery Physician · NPI 1053325589

Mark A Klaassen, MD is an Orthopedic Surgery in Warsaw, Indiana. Graduated from Indiana University School of Medicine in 1982, 44 years ago. Practices with Orthopaedics Northeast PC, a 79-clinician group and accepts Medicare assignment. Licensed in Indiana.

Years since qualifying
44
Trained at
Indiana University School of Medicine
Licensed in
IN
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

315 E 200 N Ste A
Warsaw, IN 46582
Phone: (574) 264-4163
Fax: (574) 262-9650
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence 01031923A (IN)

Record details

NPI number1053325589
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 28, 2006
Last updated in NPPESDecember 23, 2025
Certification dateDecember 23, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolINDIANA UNIVERSITY SCHOOL OF MEDICINE
Graduated 1982 (44 years in practice)
Group practice Orthopaedics Northeast Pc — 79 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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