KATE ERIN MONAHAN DO
Prescription History 1043848732
Internal Medicine in Orange, CA
What does Dr. Monahan prescribe?
In 2024, Dr. Monahan wrote 1,754 Medicare prescriptions for 59 medications. The most prescribed was Atorvastatin Calcium, with 146 prescriptions for 57 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. Monahan prescribes.
Medications 59 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 California prescribers.
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 California prescribers
Dr. Monahan wrote 146 prescriptions for Atorvastatin Calcium, about 72% as often as the typical California prescriber of it (202). Medicare paid $11.86 per fill, versus $10.47 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 California prescribers
Dr. Monahan wrote 98 prescriptions for Losartan Potassium, about 81% as often as the typical California prescriber of it (121). Medicare paid $8.19 per fill, versus $10.35 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Dr. Monahan wrote 80 prescriptions for Gabapentin, about as often as the typical California prescriber of it (80). Medicare paid $13.55 per fill, versus $15.63 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 California prescribers
Dr. Monahan wrote 79 prescriptions for Amlodipine Besylate, about half as often as the typical California prescriber of it (141). Medicare paid $3.84 per fill, versus $7.08 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 California prescribers
Dr. Monahan wrote 65 prescriptions for Lisinopril, about 67% as often as the typical California prescriber of it (98). Medicare paid $5.54 per fill, versus $8.30 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with California prescribers
Dr. Monahan wrote 63 prescriptions for Levothyroxine Sodium, about half as often as the typical California prescriber of it (125). Medicare paid $14.76 per fill, versus $13.30 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
Valsartan is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Monahan wrote 58 prescriptions for Valsartan, about 1.5 times as often as the typical California prescriber of it (39). Medicare paid $24.95 per fill, versus $28.57 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
Fluticasone is used to relieve seasonal and year-round allergic and non-allergic nasal symptoms, such as stuffy/runny nose, itching, and sneezing.
Compared with California prescribers
Dr. Monahan wrote 55 prescriptions for Fluticasone Propionate, about as often as the typical California prescriber of it (50). Medicare paid $10.49 per fill, versus $15.10 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 combination medication is used to relieve moderate to severe pain.
Compared with California prescribers
Dr. Monahan wrote 51 prescriptions for Hydrocodone-Acetaminophen, about 67% as often as the typical California prescriber of it (76). Medicare paid $11.82 per fill, versus $21.39 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
Alendronate is used to prevent and treat certain types of bone loss (osteoporosis) in adults.
Compared with California prescribers
Dr. Monahan wrote 47 prescriptions for Alendronate Sodium, about 77% as often as the typical California prescriber of it (61). Medicare paid $6.41 per fill, versus $9.65 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 California prescribers
Dr. Monahan wrote 46 prescriptions for Metoprolol Succinate, about half as often as the typical California prescriber of it (86). Medicare paid $13.79 per fill, versus $14.23 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
Famotidine is used to treat ulcers of the stomach and intestines and to prevent intestinal ulcers from coming back after they have healed.
Compared with California prescribers
Dr. Monahan wrote 45 prescriptions for Famotidine, about 83% as often as the typical California prescriber of it (54). Medicare paid $6.39 per fill, versus $12.66 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 California prescribers
Dr. Monahan wrote 43 prescriptions for Hydrochlorothiazide, about 70% as often as the typical California prescriber of it (62). Medicare paid $5.73 per fill, versus $5.71 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 California prescribers
Dr. Monahan wrote 36 prescriptions for Eliquis, about half as often as the typical California prescriber of it (73). Medicare paid $935.27 per fill, versus $923.33 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
Albuterol (also known as salbutamol) is used to prevent and treat wheezing and shortness of breath caused by breathing problems (such as asthma, chronic obstructive pulmonary disease).
Compared with California prescribers
Dr. Monahan wrote 32 prescriptions for Albuterol Sulfate Hfa, about half as often as the typical California prescriber of it (58). Medicare paid $26.34 per fill, versus $28.70 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
Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with California prescribers
Dr. Monahan wrote 31 prescriptions for Metformin Hcl, about 31% as often as the typical California prescriber of it (100). Medicare paid $8.47 per fill, versus $9.26 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 depression.
Compared with California prescribers
Dr. Monahan wrote 30 prescriptions for Bupropion Xl, about 85% as often as the typical California prescriber of it (35). Medicare paid $19.11 per fill, versus $25.68 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
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 California prescribers
Dr. Monahan wrote 29 prescriptions for Rosuvastatin Calcium, about 29% as often as the typical California prescriber of it (101). Medicare paid $20.14 per fill, versus $15.64 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 mental/mood disorders (such as depression, anxiety).
Compared with California prescribers
Dr. Monahan wrote 27 prescriptions for Escitalopram Oxalate, about half as often as the typical California prescriber of it (48). Medicare paid $11.36 per fill, versus $11.14 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
Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with California prescribers
Dr. Monahan wrote 27 prescriptions for Metformin Hcl Er, about half as often as the typical California prescriber of it (55). Medicare paid $11.58 per fill, versus $9.99 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 California prescribers
Dr. Monahan wrote 26 prescriptions for Ezetimibe, about half as often as the typical California prescriber of it (51). Medicare paid $21.89 per fill, versus $26.00 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
See also Warning section.
Compared with California prescribers
Dr. Monahan wrote 25 prescriptions for Diclofenac Sodium, about half as often as the typical California prescriber of it (47). Medicare paid $28.65 per fill, versus $107.23 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 California prescribers
Dr. Monahan wrote 25 prescriptions for Potassium Chloride, about half as often as the typical California prescriber of it (48). Medicare paid $58.12 per fill, versus $24.00 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
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 California prescribers
Dr. Monahan wrote 25 prescriptions for Pravastatin Sodium, about 66% as often as the typical California prescriber of it (38). Medicare paid $10.39 per fill, versus $13.25 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 California prescribers
Dr. Monahan wrote 24 prescriptions for Metoprolol Tartrate, about half as often as the typical California prescriber of it (57). Medicare paid $5.53 per fill, versus $7.82 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
Simvastatin 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 California prescribers
Dr. Monahan wrote 24 prescriptions for Simvastatin, about 38% as often as the typical California prescriber of it (63). Medicare paid $4.78 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
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with California prescribers
Dr. Monahan wrote 23 prescriptions for Omeprazole, about 29% as often as the typical California prescriber of it (78). Medicare paid $9.24 per fill, versus $11.26 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
Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults.
Compared with California prescribers
Dr. Monahan wrote 23 prescriptions for Zolpidem Tartrate, about half as often as the typical California prescriber of it (45). Medicare paid $5.26 per fill, versus $6.02 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 mental/mood disorders (such as depression, anxiety).
Compared with California prescribers
Dr. Monahan wrote 22 prescriptions for Duloxetine Hcl, about half as often as the typical California prescriber of it (40). Medicare paid $44.50 per fill, versus $24.72 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
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with California prescribers
Dr. Monahan wrote 22 prescriptions for Tamsulosin Hcl, about 26% as often as the typical California prescriber of it (84). Medicare paid $14.82 per fill, versus $15.02 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
Semaglutide is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Monahan wrote 21 prescriptions for Ozempic, about 37% as often as the typical California prescriber of it (56). Medicare paid $1,215.70 per fill, versus $1,102.15 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 California prescribers
Dr. Monahan wrote 20 prescriptions for Furosemide, about 31% as often as the typical California prescriber of it (64). Medicare paid $4.22 per fill, versus $6.39 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 alone or with other medications to prevent nausea and vomiting caused by cancer drug treatment (chemotherapy) and radiation therapy.
Compared with California prescribers
Dr. Monahan wrote 20 prescriptions for Ondansetron Odt, about 81% as often as the typical California prescriber of it (25). Medicare paid $23.32 per fill, versus $13.40 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
See also Warning section.
Compared with California prescribers
Dr. Monahan wrote 20 prescriptions for Tramadol Hcl, about half as often as the typical California prescriber of it (44). Medicare paid $3.02 per fill, versus $6.24 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
Pantoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with California prescribers
Dr. Monahan wrote 19 prescriptions for Pantoprazole Sodium, about 29% as often as the typical California prescriber of it (65). Medicare paid $7.49 per fill, versus $13.87 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 a variety of skin conditions (such as eczema, dermatitis, allergies, rash).
Compared with California prescribers
Dr. Monahan wrote 18 prescriptions for Triamcinolone Acetonide, about half as often as the typical California prescriber of it (43). Medicare paid $3.49 per fill, versus $10.03 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
This medication is a hormone.
Compared with California prescribers
Dr. Monahan wrote 17 prescriptions for Estradiol, about half as often as the typical California prescriber of it (38). Medicare paid $42.36 per fill, versus $56.87 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 anxiety.
Compared with California prescribers
Dr. Monahan wrote 17 prescriptions for Lorazepam, about 39% as often as the typical California prescriber of it (43). Medicare paid $2.19 per fill, versus $6.52 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
This product is used to treat high blood pressure.
Compared with California prescribers
Dr. Monahan wrote 16 prescriptions for Amlodipine-Valsartan, about half as often as the typical California prescriber of it (27). Medicare paid $39.09 per fill, versus $47.70 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 drug is used to treat high blood pressure.
Compared with California prescribers
Dr. Monahan wrote 16 prescriptions for Losartan-Hydrochlorothiazide, about 41% as often as the typical California prescriber of it (39). Medicare paid $9.78 per fill, versus $13.09 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
Spironolactone is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Monahan wrote 15 prescriptions for Spironolactone, about 40% as often as the typical California prescriber of it (37). Medicare paid $7.03 per fill, versus $10.05 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with California prescribers
Dr. Monahan wrote 15 prescriptions for Synthroid, about 39% as often as the typical California prescriber of it (38). Medicare paid $59.60 per fill, versus $74.43 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 depression.
Compared with California prescribers
Dr. Monahan wrote 15 prescriptions for Trazodone Hcl, about 26% as often as the typical California prescriber of it (57). Medicare paid $4.58 per fill, versus $9.93 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
Atenolol is used with or without other medications to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Monahan wrote 14 prescriptions for Atenolol, about 28% as often as the typical California prescriber of it (50). Medicare paid $2.86 per fill, versus $9.20 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 California prescribers
Dr. Monahan wrote 14 prescriptions for Carvedilol, about 25% as often as the typical California prescriber of it (56). Medicare paid $10.86 per fill, versus $8.98 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
Meloxicam is used to treat arthritis.
Compared with California prescribers
Dr. Monahan wrote 14 prescriptions for Meloxicam, about 28% as often as the typical California prescriber of it (50). Medicare paid $5.77 per fill, versus $4.39 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
Amoxicillin/clavulanic acid is a combination penicillin-type antibiotic used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Monahan wrote 13 prescriptions for Amoxicillin-Clavulanate Potass, about half as often as the typical California prescriber of it (26). Medicare paid $5.00 per fill, versus $9.18 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
Ibuprofen is used to relieve pain from various conditions such as headache, dental pain, menstrual cramps, muscle aches, or arthritis.
Compared with California prescribers
Dr. Monahan wrote 13 prescriptions for Ibuprofen, about 31% as often as the typical California prescriber of it (42). Medicare paid $2.88 per fill, versus $6.71 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
Montelukast is used to control and prevent symptoms caused by asthma (such as wheezing and shortness of breath).
Compared with California prescribers
Dr. Monahan wrote 13 prescriptions for Montelukast Sodium, about 27% as often as the typical California prescriber of it (49). Medicare paid $11.80 per fill, versus $10.71 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 an antibiotic used to treat bladder infections (acute cystitis).
Compared with California prescribers
Dr. Monahan wrote 13 prescriptions for Nitrofurantoin Mono-Macro, about half as often as the typical California prescriber of it (26). Medicare paid $4.17 per fill, versus $13.21 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
Azithromycin is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Monahan wrote 12 prescriptions for Azithromycin, about 31% as often as the typical California prescriber of it (38). Medicare paid $1.76 per fill, versus $4.49 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
Cholestyramine is used along with a proper diet to lower cholesterol in the blood.
Compared with California prescribers
Dr. Monahan wrote 12 prescriptions for Cholestyramine, about 61% as often as the typical California prescriber of it (20). Medicare paid $92.36 per fill, versus $72.34 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
Fluconazole is used to treat vaginal yeast infections.
Compared with California prescribers
Dr. Monahan wrote 12 prescriptions for Fluconazole, about half as often as the typical California prescriber of it (21). Medicare paid $8.01 per fill, versus $17.16 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
Icosapent ethyl is used along with certain other cholesterol medications ("statins" such as atorvastatin, simvastatin) to reduce the risk of heart attack, stroke, and certain types of heart problems that require treatment in a hospital.
Compared with California prescribers
Dr. Monahan wrote 12 prescriptions for Icosapent Ethyl, about 20% as often as the typical California prescriber of it (61). Medicare paid $48.38 per fill, versus $209.56 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 depression.
Compared with California prescribers
Dr. Monahan wrote 12 prescriptions for Mirtazapine, about 30% as often as the typical California prescriber of it (40). Medicare paid $34.00 per fill, versus $19.05 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
Allopurinol is used to treat gout and certain types of kidney stones.
Compared with California prescribers
Dr. Monahan wrote 11 prescriptions for Allopurinol, about 25% as often as the typical California prescriber of it (44). Medicare paid $10.27 per fill, versus $10.39 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
Diazepam is used to treat anxiety, alcohol withdrawal, and seizures.
Compared with California prescribers
Dr. Monahan wrote 11 prescriptions for Diazepam, about half as often as the typical California prescriber of it (24). Medicare paid $1.41 per fill, versus $6.79 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 California prescribers
Dr. Monahan wrote 11 prescriptions for Lisinopril-Hydrochlorothiazide, about 28% as often as the typical California prescriber of it (39). Medicare paid $13.36 per fill, versus $10.59 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
See also Warning section.
Compared with California prescribers
Dr. Monahan wrote 11 prescriptions for Naproxen, about 38% as often as the typical California prescriber of it (29). Medicare paid $3.36 per fill, versus $9.70 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. Monahan’s prescriptions
What does Dr. Monahan prescribe most?
In 2024 Medicare Part D data, Dr. Monahan's most prescribed medications were Atorvastatin Calcium (146), Losartan Potassium (98) and Gabapentin (80).
How does Dr. Monahan's prescribing compare with other California prescribers?
Of the 59 medications with a state comparison, Dr. Monahan prescribes 1 more often than the typical California prescriber, 7 about as often and 51 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Monahan 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 California 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.
