Quick answers
- Which hospitals does Gregory D. Johnsen work at?
- Medicare's official clinician data lists Gregory D. Johnsen at 5 hospitals: Cherokee Nation W W Hastings Indian Hospital, Hillcrest Hospital Claremore, Hillcrest Hospital Pryor, Hillcrest Hospital South and Hillcrest Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory D. Johnsen see patients?
- Medicare's clinician data lists 3 practice locations, including Tulsa, OK and Claremore, OK. Call before your visit to confirm the address.
- What is Gregory D. Johnsen's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Gregory D. Johnsen accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory D. Johnsen 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 Gregory D. Johnsen?
- (918) 579-3627, as listed in official Medicare / NPI Registry data.
- What is Gregory D. Johnsen's NPI number?
- 1710957105. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory D. Johnsen works
Medicare's Facility Affiliation Data lists Gregory D. Johnsen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Cherokee Nation W W Hastings Indian HospitalTahlequah, OK · Acute Care Hospital · CCN 370171
- Hillcrest Hospital ClaremoreClaremore, OK · Acute Care Hospital · CCN 370039
- Hillcrest Hospital PryorPryor, OK · Acute Care Hospital · CCN 370015
- Hillcrest Hospital SouthTulsa, OK · Acute Care Hospital · CCN 370202
- Hillcrest Medical CenterTulsa, OK · Acute Care Hospital · CCN 370001
Practice locations
Addresses where Gregory D. Johnsen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1265 S Utica AveTulsa, OK 74104
- 1501 N Florence Ave, Suite 101 201 250 and 300Claremore, OK 74017 (918) 579‑3627
- 9228 S Mingo Rd, Suite 200Tulsa, OK 74133 (918) 592‑0999
Group practices
Medicare enrollment lists Gregory D. Johnsen as a member of these groups (CMS data updated 2026-10-02).
- Ahs Oklahoma Heart LLC132 clinicians in the group
- Ahs Claremore Regional Hospital LLC31 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Oklahoma →
Other cardiologists in Tulsa
Clinicians with the same Medicare primary specialty in Tulsa, OK — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Oklahoma College Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1710957105 |
| 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