RONALD L MAAG M.D.
Prescription History 1982998183
Internal Medicine - Cardiovascular Disease in Houston, TX
What does Dr. Maag prescribe?
In 2024, Dr. Maag wrote 1,817 Medicare prescriptions for 28 medications. The most prescribed was Rosuvastatin Calcium, with 215 prescriptions for 72 patients.
Medicare Part D only. These are prescriptions filled by people with Medicare drug coverage in 2024, from the CMS data released in 2026, the most recent year available. CMS does not publish medications with fewer than 11 prescriptions, so this is not a full list of what Dr. Maag prescribes.
Medications 28 medications
Prescriptions filled under Medicare Part D in 2024. Select a medication to see what it is used for and how it compares with other Texas prescribers.
What it is used for
Rosuvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Texas prescribers
Dr. Maag wrote 215 prescriptions for Rosuvastatin Calcium, about 1.8 times as often as the typical Texas prescriber of it (122). Medicare paid $12.94 per fill, versus $13.19 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Atorvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Texas prescribers
Dr. Maag wrote 187 prescriptions for Atorvastatin Calcium, about as often as the typical Texas prescriber of it (180). Medicare paid $10.29 per fill, versus $9.48 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Carvedilol is used to treat high blood pressure and heart failure.
Compared with Texas prescribers
Dr. Maag wrote 180 prescriptions for Carvedilol, about 2.5 times as often as the typical Texas prescriber of it (71). Medicare paid $8.30 per fill, versus $8.22 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 141 prescriptions for Amlodipine Besylate, about as often as the typical Texas prescriber of it (133). Medicare paid $6.09 per fill, versus $6.07 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Apixaban is used to prevent serious blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip/knee replacement surgery.
Compared with Texas prescribers
Dr. Maag wrote 110 prescriptions for Eliquis, about 1.4 times as often as the typical Texas prescriber of it (81). Medicare paid $942.74 per fill, versus $870.72 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 110 prescriptions for Metoprolol Succinate, about as often as the typical Texas prescriber of it (101). Medicare paid $13.60 per fill, versus $14.00 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Nifedipine is used alone or in combination with other drugs to treat high blood pressure (hypertension).
Compared with Texas prescribers
Dr. Maag wrote 99 prescriptions for Nifedipine Er, about 2.5 times as often as the typical Texas prescriber of it (39). Medicare paid $20.47 per fill, versus $25.74 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Losartan is used to treat high blood pressure (hypertension) and to help protect the kidneys from damage due to diabetes.
Compared with Texas prescribers
Dr. Maag wrote 98 prescriptions for Losartan Potassium, about 88% as often as the typical Texas prescriber of it (111). Medicare paid $8.79 per fill, versus $9.74 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Furosemide is used to reduce extra fluid in the body (edema) caused by conditions such as heart failure, liver disease, and kidney disease.
Compared with Texas prescribers
Dr. Maag wrote 81 prescriptions for Furosemide, about as often as the typical Texas prescriber of it (78). Medicare paid $4.84 per fill, versus $5.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Ezetimibe is used along with a low cholesterol/low fat diet and exercise to help lower cholesterol in the blood.
Compared with Texas prescribers
Dr. Maag wrote 78 prescriptions for Ezetimibe, about 1.5 times as often as the typical Texas prescriber of it (53). Medicare paid $32.04 per fill, versus $23.89 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Lisinopril is used to treat high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 50 prescriptions for Lisinopril, about half as often as the typical Texas prescriber of it (108). Medicare paid $2.93 per fill, versus $7.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 49 prescriptions for Hydrochlorothiazide, about 76% as often as the typical Texas prescriber of it (65). Medicare paid $2.69 per fill, versus $4.50 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Spironolactone is used to treat high blood pressure and heart failure.
Compared with Texas prescribers
Dr. Maag wrote 47 prescriptions for Spironolactone, about as often as the typical Texas prescriber of it (44). Medicare paid $6.55 per fill, versus $9.03 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Hydralazine is used with or without other medications to treat high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 45 prescriptions for Hydralazine Hcl, about as often as the typical Texas prescriber of it (42). Medicare paid $26.83 per fill, versus $12.44 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Evolocumab is used along with a proper diet to help lower "bad" cholesterol (LDL) in the blood.
Compared with Texas prescribers
Dr. Maag wrote 44 prescriptions for Repatha Sureclick, about as often as the typical Texas prescriber of it (45). Medicare paid $651.58 per fill, versus $872.18 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Clopidogrel is used to prevent heart attacks and strokes in persons with heart disease (recent heart attack), recent stroke, or blood circulation disease (peripheral vascular disease).
Compared with Texas prescribers
Dr. Maag wrote 39 prescriptions for Clopidogrel, about 61% as often as the typical Texas prescriber of it (64). Medicare paid $8.60 per fill, versus $11.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Isosorbide mononitrate is used to prevent chest pain (angina) in patients with a certain heart condition (coronary artery disease).
Compared with Texas prescribers
Dr. Maag wrote 27 prescriptions for Isosorbide Mononitrate Er, about 63% as often as the typical Texas prescriber of it (43). Medicare paid $9.12 per fill, versus $11.85 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat blood clots (such as in deep vein thrombosis-DVT or pulmonary embolus-PE) and/or to prevent new clots from forming in your body.
Compared with Texas prescribers
Dr. Maag wrote 27 prescriptions for Warfarin Sodium, about 80% as often as the typical Texas prescriber of it (34). Medicare paid $14.93 per fill, versus $8.54 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This product is used to treat certain types of heart failure.
Compared with Texas prescribers
Dr. Maag wrote 26 prescriptions for Entresto, about half as often as the typical Texas prescriber of it (53). Medicare paid $1,494.98 per fill, versus $1,062.82 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is a mineral supplement used to treat or prevent low amounts of potassium in the blood.
Compared with Texas prescribers
Dr. Maag wrote 24 prescriptions for Potassium Chloride, about 39% as often as the typical Texas prescriber of it (62). Medicare paid $13.41 per fill, versus $19.18 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Metoprolol is used with or without other medications to treat high blood pressure (hypertension).
Compared with Texas prescribers
Dr. Maag wrote 22 prescriptions for Metoprolol Tartrate, about 38% as often as the typical Texas prescriber of it (59). Medicare paid $2.96 per fill, versus $6.73 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Bumetanide is used to reduce extra fluid in the body (edema) caused by conditions such as heart failure, liver disease, and kidney disease.
Compared with Texas prescribers
Dr. Maag wrote 21 prescriptions for Bumetanide, about 72% as often as the typical Texas prescriber of it (29). Medicare paid $11.76 per fill, versus $33.57 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Rivaroxaban is used to prevent blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip or knee replacement surgery.
Compared with Texas prescribers
Dr. Maag wrote 18 prescriptions for Xarelto, about 40% as often as the typical Texas prescriber of it (45). Medicare paid $1,515.07 per fill, versus $943.32 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Nebivolol is used to treat high blood pressure.
Compared with Texas prescribers
Dr. Maag wrote 17 prescriptions for Nebivolol Hcl, about half as often as the typical Texas prescriber of it (30). Medicare paid $71.83 per fill, versus $54.40 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain types of serious (possibly fatal) irregular heartbeat (such as sustained ventricular tachycardia and paroxysmal supraventricular tachycardia).
Compared with Texas prescribers
Dr. Maag wrote 16 prescriptions for Flecainide Acetate, about 31% as often as the typical Texas prescriber of it (52). Medicare paid $40.56 per fill, versus $37.86 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Olmesartan is used to treat high blood pressure (hypertension).
Compared with Texas prescribers
Dr. Maag wrote 16 prescriptions for Olmesartan Medoxomil, about 37% as often as the typical Texas prescriber of it (43). Medicare paid $16.09 per fill, versus $18.82 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Torsemide is used to reduce extra fluid in the body (edema) caused by conditions such as heart failure, liver disease, and kidney disease.
Compared with Texas prescribers
Dr. Maag wrote 16 prescriptions for Torsemide, about half as often as the typical Texas prescriber of it (36). Medicare paid $40.81 per fill, versus $19.52 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Pravastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Texas prescribers
Dr. Maag wrote 14 prescriptions for Pravastatin Sodium, about 27% as often as the typical Texas prescriber of it (52). Medicare paid $22.65 per fill, versus $13.28 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
Questions about Dr. Maag’s prescriptions
What does Dr. Maag prescribe most?
In 2024 Medicare Part D data, Dr. Maag's most prescribed medications were Rosuvastatin Calcium (215), Atorvastatin Calcium (187) and Carvedilol (180).
How does Dr. Maag's prescribing compare with other Texas prescribers?
Of the 28 medications with a state comparison, Dr. Maag prescribes 5 more often than the typical Texas prescriber, 10 about as often and 13 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Maag prescribes?
No. It covers prescriptions filled by people with Medicare Part D drug coverage in 2024, and CMS leaves out any medication with fewer than 11 prescriptions.
About this data
This page shows one provider’s slice of public Medicare files. NPI Profile does not receive prescriptions or patient records.
| Source | What it provides here | Data year |
|---|---|---|
| CMS Medicare Part D Prescribers by Provider and Drug | Each medication, prescriptions, patients, 30-day fills, days of medication and cost. State comparisons average the Texas prescribers of the same medication and form, where at least five wrote it. | 2024 (released 2026, the most recent available) |
| CMS Medicare Part D Drug Spending Dashboard | What each medication is used for. | 2024 |
- Only prescriptions filled by people with Medicare Part D drug coverage are counted. Private insurance, Medicaid and cash purchases are not.
- CMS leaves out medications with fewer than 11 prescriptions and hides patient counts under 11.
- Cost per fill is what the plan and the patient paid the pharmacy together, not what you pay at the counter.
- Medication descriptions are summaries from CMS. They are not medical advice; ask a health care professional about any medication.
