Dr. Mark A. Walker , MD
Internal Medicine • Gallipolis, OH
90 Jackson Pike
Gallipolis, OH 456311560
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on June 26, 2006; this date does not establish years in practice.
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Published CMS data list 1,037 Medicare Part D prescriptions, including refills, in 2015.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015. Published rows only; this is not a quality measure.
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Published Part D records, 2015:
- Levothyroxine Sodium — 119 prescription fills, including refills.
- Amlodipine Besylate — 83 prescription fills, including refills.
- Metformin Hcl Er (Metformin Hcl) — 68 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 32 records in the table · Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 6,739 in 2013 to 1,037 in 2015.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2013–2015.
Practice Location & Contact Primary Location
90 Jackson Pike
Gallipolis, OH 456311560
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Internal Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
1,790 standardized 30-day fills in 2015
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$26,343 in 2015
The total cost of these prescriptions in 2015, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2015.
Industry payments (Open Payments)
No Open Payments records are listed for this clinician for 2019–2025.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Gallipolis and Ohio
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Walker are from 2015.
20 active clinicians are listed under Internal Medicine with a practice address in Gallipolis, OH (5,283 in Ohio).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Gallipolis
20% of these 20 clinicians have the CMS telehealth indicator.
45% of these 20 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions decreased 85% from 6,739 in 2013 to 1,037 in 2015.
- 2013: 6,739
- 2014: 6,521
- 2015: 1,037
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30-day fills
30-day fills decreased 83% from 10,373 in 2013 to 1,790 in 2015.
- 2013: 10,373
- 2014: 10,447
- 2015: 1,790
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Part D drug cost
Part D drug cost decreased 91% from $288,117 in 2013 to $26,343 in 2015.
- 2013: $288,117
- 2014: $297,931
- 2015: $26,343
Sources: CMS Medicare Part D Prescribers (2015), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2015.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Levothyroxine Sodium | Levothyroxine Sodium | 119 | 5,685 | $1,687.68 | 51 |
| Amlodipine Besylate | Amlodipine Besylate | 83 | 3,780 | $660.89 | 35 |
| Metformin Hcl Er | Metformin Hcl | 68 | 3,470 | $436.65 | 25 |
| Losartan Potassium | Losartan Potassium | 67 | 3,690 | $622.93 | 32 |
| Metoprolol Tartrate | Metoprolol Tartrate | 57 | 2,790 | $311.09 | 26 |
| Lisinopril | Lisinopril | 52 | 2,280 | $254.48 | 18 |
| Atorvastatin Calcium | Atorvastatin Calcium | 50 | 3,028 | $764.14 | 25 |
| Lovastatin | Lovastatin | 45 | 1,950 | $333.98 | 16 |
| Pravastatin Sodium | Pravastatin Sodium | 45 | 1,700 | $815.89 | 12 |
| Simvastatin | Simvastatin | 41 | 2,550 | $295.82 | 20 |
| Warfarin Sodium | Warfarin Sodium | 31 | 1,547 | $347.34 | 16 |
| Metoprolol Succinate | Metoprolol Succinate | 31 | 1,170 | $556.88 | 13 |
| Sertraline Hcl | Sertraline Hcl | 29 | 1,710 | $473.36 | 12 |
| Clopidogrel | Clopidogrel Bisulfate | 28 | 2,160 | $1,942.20 | 14 |
| Triamterene-Hydrochlorothiazid | Triamterene/Hydrochlorothiazid | 27 | 1,290 | $271.85 | — |
| Potassium Chloride | Potassium Chloride | 26 | 1,200 | $715.95 | 12 |
| Tamsulosin Hcl | Tamsulosin Hcl | 22 | 1,080 | $623.07 | — |
| Omeprazole | Omeprazole | 21 | 1,169 | $330.68 | 12 |
| Metformin Hcl | Metformin Hcl | 19 | 1,350 | $158.29 | 12 |
| Advair Diskus | Fluticasone/Salmeterol | 16 | 540 | $5,765.64 | — |
| Furosemide | Furosemide | 16 | 930 | $50.63 | 11 |
| Glimepiride | Glimepiride | 16 | 1,031 | $162.11 | — |
| Lansoprazole | Lansoprazole | 15 | 690 | $510.80 | — |
| Amlodipine Besylate-Benazepril | Amlodipine Besylate/Benazepril | 14 | 1,020 | $1,029.79 | — |
| Atenolol | Atenolol | 13 | 930 | $101.28 | — |
(top 25 shown)
Source: CMS Part D by Provider and Drug, 2015; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 207RX0202X
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
NUCC Taxonomy Code: 207RX0202X
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Allergy & Immunology
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Osteopathic Medicine (D.O.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated June 26, 2006.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Internal Medicine Providers in Gallipolis
- Dr. Sananjay Singh, MD
- Dr. Michael Owens, MD
- Dr. Arlie Wheeler, DO
- Dr. Gerald Vallee, MD
- Dr. Renuka Kandula, MD
- Dr. Jennifer Calafato, DO
Mailing Address
90 Jackson Pike
Gallipolis, OH 456311560
Phone: 7404465131