Quick answers
- Which hospitals does Mark Greenwell work at?
- Medicare's official clinician data lists Mark Greenwell at 5 hospitals: CHRISTUS Mother Frances Hospital, CHRISTUS Mother Frances Hospital Sulphur Springs, McCurtain Memorial Hospital, Paris Regional Medical Center and Titus Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark Greenwell see patients?
- Medicare's clinician data lists 2 practice locations, including Paris, TX and Idabel, OK. Call before your visit to confirm the address.
- What is Mark Greenwell's specialty?
- Medicare lists Nephrology as the primary specialty, and also Internal Medicine.
- Does Mark Greenwell accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Greenwell 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.
- Does Mark Greenwell offer telehealth?
- Medicare's clinician data says Mark Greenwell offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Mark Greenwell?
- (903) 785-3300, as listed in official Medicare / NPI Registry data.
- What is Mark Greenwell's NPI number?
- 1184681371. 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 Greenwell works
Medicare's Facility Affiliation Data lists Mark Greenwell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- CHRISTUS Mother Frances HospitalTyler, TX · Acute Care Hospital · CCN 450102
- CHRISTUS Mother Frances Hospital Sulphur SpringsSulphur Springs, TX · Acute Care Hospital · CCN 450236
- McCurtain Memorial HospitalIdabel, OK · Critical Access Hospital · CCN 371342
- Paris Regional Medical CenterParis, TX · Acute Care Hospital · CCN 450196
- Titus Regional Medical CenterMount Pleasant, TX · Acute Care Hospital · CCN 450080
Practice locations
Addresses where Mark Greenwell is enrolled with Medicare (CMS data updated 2026-10-02).
- 1055 Clarksville St, Suite 110Paris, TX 75460 (903) 785‑3300
- 403 S Indian RdIdabel, OK 74745 (903) 785‑3300
Group practices
Medicare enrollment lists Mark Greenwell as a member of this group (CMS data updated 2026-10-02).
- Tyler Nephrology Associates PA27 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Texas
Clinicians with the same Medicare primary specialty in Texas — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At Houston |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184681371 |
| 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