Quick answers
- Which hospitals does Matthew D. Armstrong work at?
- Medicare's official clinician data lists Matthew D. Armstrong at 5 hospitals: Northeastern Health System, Saint Francis Hospital Muskogee, Saint Francis Hospital South, LLC, Saint Francis Hospital Vinita, Inc and Saint Francis Hospital, Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Matthew D. Armstrong see patients?
- Medicare's clinician data lists 2 practice locations, including Tulsa, OK. Call before your visit to confirm the address.
- What is Matthew D. Armstrong's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Internal Medicine.
- Does Matthew D. Armstrong accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew D. Armstrong 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 Matthew D. Armstrong?
- (918) 494-6164, as listed in official Medicare / NPI Registry data.
- What is Matthew D. Armstrong's NPI number?
- 1457363236. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Matthew D. Armstrong works
Medicare's Facility Affiliation Data lists Matthew D. Armstrong at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northeastern Health SystemTahlequah, OK · Acute Care Hospital · CCN 370089
- Saint Francis Hospital MuskogeeMuskogee, OK · Acute Care Hospital · CCN 370025
- Saint Francis Hospital South, LLCTulsa, OK · Acute Care Hospital · CCN 370218
- Saint Francis Hospital Vinita, IncVinita, OK · Acute Care Hospital · CCN 370237
- Saint Francis Hospital, IncTulsa, OK · Acute Care Hospital · CCN 370091
Practice locations
Addresses where Matthew D. Armstrong is enrolled with Medicare (CMS data updated 2026-10-02).
- 6161 S Yale AveTulsa, OK 74136 (918) 494‑6164
- 6600 S Yale Ave, Suite 1400Tulsa, OK 74136 (918) 488‑6000
Group practices
Medicare enrollment lists Matthew D. Armstrong as a member of these groups (CMS data updated 2026-10-02).
- Warren Clinic Inc883 clinicians in the group
- Saint Francis Hospital, Inc.61 clinicians in the group
Specialties
- Medical Oncologyprimary
- Internal Medicinealso
Other oncologists in Tulsa
Clinicians with the same Medicare primary specialty in Tulsa, OK — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457363236 |
| 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