Marilyn M. Landrum, MD
Internal Medicine Physician · Denison, TX
Marilyn M. Landrum, MD is an internal medicine physician with a practice address in Denison, Texas, and NPI 1285683987, issued on May 9, 2006. Check the license (Texas L0363, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Marilyn M. Landrum
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- L0363 TX
Self-reported in NPPES; status is on the state search - Practice location
- 5012 S US Highway 75, Denison, TX 75020
- Phone
- (930) 416-6025
- Enumerated
- May 9, 2006
- Record last updated
- Jan 26, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (903) 416-6138
- Medicaid IDs
- 100229300A OK
042108301 TX - Medicare enrollment
- Enrolled (PECOS I20100813000879); accepts Medicare assignment
- Medical or professional school
- Sanford School Of Medicine Of University Of South Dakota, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 9,175 in Texas → Look up another NPI →
Also registered at 5012 S US Highway 75
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bill Balch, MDInternal Medicine Physician1548219959
- Steven Bentley, PA-CPhysician Assistant1760557946
- Timothy Brumit, MDPediatrics Physician1043269202
- Gregory Carlson, MDFamily Medicine Physician1386694438
- Robert Church, MDFamily Medicine Physician1306048673
- Charlene Crumby, RN MSN FNPWomen's Health Nurse Practitioner1790999480
Verify Marilyn M. Landrum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license L0363Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average internal medicine physician in 2024
9,337 Medicare Part D claims for 522 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 171 claims were for opioids.
Most prescribed
- Levothyroxine Sodium366 claims
- Atorvastatin Calcium313 claims
- Amlodipine Besylate308 claims
- Losartan Potassium299 claims
- Gabapentin261 claims
- Montelukast Sodium248 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $462.65
27 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Legacy Healthcare Services IncMcKinney, TX
- TexomacareDenison, TX
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marilyn M. Landrum among 9,175 internal medicine physician records in Texas
Marilyn M. Landrum, MD is one of 9,175 internal medicine physician records with a practice address in Texas. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1994 · median 2004 among the 6,088 with a school on file
- Record last updated2018 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 internal medicine physician records list a practice address in Denison
They are 20 of the 554 NPPES records with a practice address in Denison, and 9,175 internal medicine physician records in Texas.
All 9,175 in Texas → Every provider in Denison → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Jenson Abraham, M.D.Denison, TX 750201205074135
- Bill Balch, MDDenison, TX 750201548219959
- Angelica Balingit, MDDenison, TX 750201861436040
- Charles Derbes, MDDenison, TX 750201427003466
- Nasheel Joules, M.D.Denison, TX 750201063670628
- Birendra Lal, M.D.Denison, TX 750201760437719
- Vanessa Ohnes-Verduguez, M.D.Denison, TX 750201396988770
- Robert Sanders, MDDenison, TX 750201528001781
Common questions
What is Marilyn M. Landrum, MD's NPI number?
Marilyn M. Landrum, MD's National Provider Identifier (NPI) is 1285683987, issued on May 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marilyn M. Landrum, MD located?
The NPPES record lists a practice address at 5012 S US Highway 75, Denison, TX, 75020. Phone: (930) 416-6025. Providers update this record themselves, so call before visiting.
How can I verify Marilyn M. Landrum, MD's license?
NPPES lists Texas license number L0363, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marilyn M. Landrum, MD prescribe under Medicare Part D?
In 2024, Marilyn M. Landrum, MD had 9,337 Medicare Part D claims for 522 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.