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

Marc D. Knudsen, DO

Individual provider Emergency Medicine Physician · NPI 1235125683

Marc D. Knudsen, DO is an Emergency Medicine Physician in Oklahoma City, Oklahoma. Licensed in Oklahoma. Registered with an NPI since 2005.

Licensed in
OK
In the registry since
2005
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

3300 NW Expy
Oklahoma City, OK 73112-4418
Phone: (405) 951-2541
Fax: (405) 951-2237
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 3859 (OK)

Record details

NPI number1235125683
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedSeptember 21, 2005
Last updated in NPPESApril 9, 2021
Certification dateApril 9, 2021

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