MARILYN M LANDRUM (MD) – Internal Medicine Physician, NPI 1285683987
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
13,290 INTERNAL MEDICINE in TX
Provider Addresses for MARILYN M LANDRUM (MD)
5012 S US HIGHWAY 75 STE 300
ATTN BILLING
DENISON, TX 750204589
Phone: (903) 416-6025
Type: Mailing
5012 S US HIGHWAY 75
SUITE 300
DENISON, TX 750204587
Phone: (930) 416-6025
Fax: (903) 416-6138
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 46 Open Payments records for all available years, with a total value of $804.
Total Amount is formed as General ($804) + Research ($0) + Ownership ($0) = $804.
Last reported payment date: 2024-12-03 • Largest payer in this snapshot: Amgen Inc. ($235).
Total Amount
$804
General + Research + Ownership
Payments
46
Total payment records
General Amount
$804
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-03
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Amgen Inc. | $235 |
| AstraZeneca Pharmaceuticals LP | $94 |
| Exact Sciences Corporation | $79 |
| GlaxoSmithKline, LLC. | $62 |
| Merck Sharp & Dohme LLC | $53 |
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: 2010-08-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
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 |
|---|---|---|---|---|
| I20100813000879 | I | Internal Medicine | TX | 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 |
|---|---|---|---|---|
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 685 | 300 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 560 | 272 | $0 |
| 80053 | Blood test, comprehensive group of blood chemicals | 416 | 251 | $0 |
| 80061 | Blood test, lipids (cholesterol and triglycerides) | 407 | 246 | $0 |
| 85025 | Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 312 | 246 | $0 |
Insurance plans in this area (ZIP 75020)
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Provider's Procedures
Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Family Practice | TX | |
| Family Practice | TX | |
| Internal Medicine | MO | |
| Family Practice | TX | |
| Family Practice | TX | |
| - | TX | |
| Nurse Practitioner | TX | |
| Family Practice | TX |
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