MARC D. KNUDSEN D.O.
NPI 1235125683
Emergency Medicine in Oklahoma City, OK
About Marc D. Knudsen D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARC D. KNUDSEN D.O. (NPI 1235125683) is an individual emergency medicine provider in Oklahoma City, Oklahoma, licensed in Oklahoma (3859) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Marc D. Knudsen D.o. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Marc Knudsen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oklahoma City, OK 73102
- Reassigned Medicare billing, Oklahoma enrollment
- Medicare enrollment name: Emergency Physicians Of Mid-America PC
- 310 clinicians in this Medicare group
Norman, OK 73071
- Reassigned Medicare billing, Oklahoma enrollment
- 418 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 73112 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OKLAHOMA CITY, OK 73112
OKLAHOMA CITY, OK 73112
OKLAHOMA CITY, OK 73112
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marc Knudsen's NPI number?
The NPI number for Marc Knudsen is 1235125683. It was assigned to this individual provider in the NPPES registry on September 21, 2005.
Where is Marc Knudsen located?
Marc Knudsen practices at 3300 NW Expressway, Oklahoma City, OK 73112. The listed phone number is (405) 951-2541.
What is Marc Knudsen's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Marc Knudsen enrolled in Medicare?
Yes. Marc Knudsen is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Marc Knudsen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marc Knudsen reassigns Medicare benefits to 2 organizations: Emergency Physicians Of Mid-America, P.C. (Oklahoma City, OK) and Emergency Services Of Oklahoma PC (Norman, OK). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marc Knudsen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Marc Knudsen was last updated on April 9, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Marc D. Knudsen, D.O. · NPI 1235125683
Emergency Medicine physician in Oklahoma City, Oklahoma. Individual provider, active in the CMS NPPES registry since September 21, 2005.
## Identity
- **NPI:** 1235125683 (Entity type: Individual)
- **Enumerated:** September 21, 2005
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 3859 (Oklahoma)
- **Sole proprietor:** No
## Practice location
- **Address:** 3300 NW EXPRESSWAY, Oklahoma City, OK 73112-4418
- **Phone:** (405) 951-2541 · **Fax:** (405) 951-2237
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Emergency Physicians Of Mid-America, P.C. (NPI 1063825297, Oklahoma City, OK); Emergency Services Of Oklahoma PC (NPI 1215249891, Norman, OK) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 9, 2021
- **Other identifiers:** Medicaid 100259600A (OK)
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Source: [NPI Profile](https://npiprofile.com/npi/1235125683) · Data from the CMS NPPES public registry.