Marc Knudsen, D.O.
NPI 1235125683 · Emergency Medicine Physician · Oklahoma City, OK
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marc Knudsen, D.O. is a Emergency Medicine Physician provider in Oklahoma City, OK (NPI 1235125683).
Provider details
- NPI number
- 1235125683
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 3859 (OK)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
193 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Telephone Medical Discussion With Physician, 21-30 Minutes99443 | 119 | $89 |
| Telephone Medical Discussion With Physician, 5-10 Minutes99441 | 48 | $32 |
| Telephone Medical Discussion With Physician, 11-20 Minutes99442 | 26 | $60 |
Typical Medicare-allowed amounts for these services range $32–$89 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-09-21
- Last updated
- 2021-04-09
- Certified
- 2021-04-09
Frequently asked questions
- What is Marc Knudsen's NPI number?
- Marc Knudsen's National Provider Identifier (NPI) is 1235125683, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marc Knudsen's specialty?
- Marc Knudsen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Marc Knudsen located?
- Marc Knudsen's practice location on file with NPPES is 3300 Nw Expressway, Oklahoma City, OK 73112-4418.
- What is Marc Knudsen's phone number?
- The practice phone number listed in the NPPES registry for Marc Knudsen is (405) 951-2541.
- Does Marc Knudsen accept Medicare?
- Marc Knudsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marc Knudsen's NPI active?
- Yes — Marc Knudsen's NPI (1235125683) is active in the NPPES registry as of the last update on 2021-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.