Quick answers
- Which hospitals does Mark R. Olsen work at?
- Medicare's official clinician data lists Mark R. Olsen at 4 hospitals: Ascension St John Medical Center, Cherokee Nation W W Hastings Indian Hospital, Saint Francis Hospital South, LLC and Saint Francis Hospital, Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark R. Olsen see patients?
- Medicare's clinician data lists 3 practice locations, including Tulsa, OK and Bartlesville, OK. Call before your visit to confirm the address.
- What is Mark R. Olsen's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Hematology.
- Does Mark R. Olsen accept Medicare assignment?
- Yes. Medicare's clinician data says Mark R. Olsen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark R. Olsen?
- (918) 505-3200, as listed in official Medicare / NPI Registry data.
- What is Mark R. Olsen's NPI number?
- 1356382592. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark R. Olsen works
Medicare's Facility Affiliation Data lists Mark R. Olsen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension St John Medical CenterTulsa, OK · Acute Care Hospital · CCN 370114
- Cherokee Nation W W Hastings Indian HospitalTahlequah, OK · Acute Care Hospital · CCN 370171
- Saint Francis Hospital South, LLCTulsa, OK · Acute Care Hospital · CCN 370218
- Saint Francis Hospital, IncTulsa, OK · Acute Care Hospital · CCN 370091
Practice locations
Addresses where Mark R. Olsen is enrolled with Medicare (CMS data updated 2026-10-02).
- 12697 E 51st StTulsa, OK 74146 (918) 505‑3200
- 1923 S Utica AveTulsa, OK 74104
- 3470 E Frank Phillips BlvdBartlesville, OK 74006 (918) 331‑1760
Group practices
Medicare enrollment lists Mark R. Olsen as a member of this group (CMS data updated 2026-10-02).
- Oklahoma Cancer Specialists and Research Institute, LLC47 clinicians in the group
Specialties
- Medical Oncologyprimary
- Hematologyalso
Other oncologists in Tulsa
Clinicians with the same Medicare primary specialty in Tulsa, OK — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356382592 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians