MARK W. GREENWELL (M.D.) – Nephrology Physician, NPI 1184681371
Nephrology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
123 NEPHROLOGY in OK
Provider Addresses for MARK W. GREENWELL (M.D.)
1104 E Lincoln Rd
Idabel, OK 747457364
Phone: (903) 785-3300
Fax: (903) 785-3310
Type: Location
105 Medical Cir Bldg 3
Sulphur Springs, TX 754822138
Phone: (903) 785-3300
Fax: (903) 785-3310
Type: Location
1133 MEDICAL DR
TYLER, TX 757012130
Phone: (903) 595-5486
Fax: (903) 595-5128
Type: Mailing
635, Stone Avenue, Paris, Lamar County, Texas, 75460, United States
PARIS, TX 754609342
Phone: (903) 785-3300
Fax: (903) 785-3310
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 6 Open Payments records for all available years, with a total value of $118.
Total Amount is formed as General ($118) + Research ($0) + Ownership ($0) = $118.
Last reported payment date: 2024-01-30 • Largest payer in this snapshot: Ascendis Pharma Inc ($75).
Total Amount
$118
General + Research + Ownership
Payments
6
Total payment records
General Amount
$118
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-01-30
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2013-01-17
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20120906000268 | I | Nephrology | TX | TBD |
| I20130117000319 | I | Nephrology | OK | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 506 | 354 | $0 |
| 90970 | Dialysis services, per day, less than full month service (20 years or older) | 406 | 24 | $0 |
| 99232 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 358 | 109 | $0 |
| 99233 | Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 295 | 127 | $0 |
| 90960 | Dialysis services, 4 or more physician visits per month (20 years or older) | 257 | 74 | $0 |
Insurance plans in this area (ZIP 74745)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| NEPHROLOGY | TX | 90935 | Hemodialysis procedure with one physician evaluation | 134 | 52 |
| NEPHROLOGY | TX | 90961 | Dialysis services (2-3 physician visits per month), patient 20 years of age and older | 183 | 91 |
| NEPHROLOGY | TX | 90966 | Home dialysis services per month, patient 20 years of age or older | 274 | 37 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Nephrology, Internal Medicine | TX | |
| Nephrology, Internal Medicine | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| - | TX |
Reviews
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