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

Karen A Diefenbach, MD

Individual provider Colon & Rectal Surgery Physician · NPI 1164658258

Karen A Diefenbach, MD is a Colon & Rectal Surgery Physician in Columbus, Ohio. Works from 8 locations. Licensed in Ohio.

Licensed in
OH
In the registry since
2009
Specialties on file
2
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

555 S 18th St
Columbus, OH 43205-2654
Phone: (614) 722-6200
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (7)

  • 26 Hospital Dr, Athens, OH 45701-2471 — (614) 722-2000
  • 700 Childrens Dr, Columbus, OH 43205-2664 — (614) 722-6200
  • 5665 Venture Dr, Dublin, OH 43017-2159 — (614) 722-6200
  • 536 S Trimble Rd, Mansfield, OH 44906-3418 — (614) 722-6200
  • 2222 Cherry St Ste 1800, Toledo, OH 43608-2679 — (614) 722-4300
  • 2213 Cherry St, Toledo, OH 43608-2603 — (419) 251-4300
  • 455 Executive Campus Dr, Westerville, OH 43082-8870 — (614) 722-6200

Specialties & licences

Pediatric Surgery Physician (primary) Taxonomy 2086S0120X · Licence 35.099337 (OH)
Colon & Rectal Surgery Physician Taxonomy 208C00000X · Licence 35.099337 (OH)

Record details

NPI number1164658258
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 3, 2009
Last updated in NPPESNovember 19, 2024
Certification dateNovember 19, 2024

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