RONALD E MASON MD
Prescription History 1124088430
Internal Medicine - Gastroenterology in Kirkland, WA
What does Dr. Mason prescribe?
In 2024, Dr. Mason wrote 986 Medicare prescriptions for 21 medications. The most prescribed was Pantoprazole Sodium, with 442 prescriptions for 97 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. Mason prescribes.
Medications 21 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 Washington prescribers.
What it is used for
Pantoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with Washington prescribers
Dr. Mason wrote 442 prescriptions for Pantoprazole Sodium, about 9.1 times as often as the typical Washington prescriber of it (49). Medicare paid $11.97 per fill, versus $14.19 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
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 Washington prescribers
Dr. Mason wrote 82 prescriptions for Famotidine, about 2.1 times as often as the typical Washington prescriber of it (39). Medicare paid $8.93 per fill, versus $16.42 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 Washington prescribers
Dr. Mason wrote 78 prescriptions for Omeprazole, about as often as the typical Washington prescriber of it (78). Medicare paid $26.48 per fill, versus $15.28 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
Sodium/potassium/magnesium sulfate solution is used to clean out the intestines before a certain bowel exam procedure (colonoscopy).
Compared with Washington prescribers
Dr. Mason wrote 55 prescriptions for Sod Sulf-Potass Sulf-Mag Sulf, about 86% as often as the typical Washington prescriber of it (64). Medicare paid $64.03 per fill, versus $63.80 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 along with a proper diet and exercise to lower cholesterol in people with high levels of cholesterol in the blood.
Compared with Washington prescribers
Dr. Mason wrote 35 prescriptions for Colesevelam Hcl, about 1.8 times as often as the typical Washington prescriber of it (20). Medicare paid $89.28 per fill, versus $132.22 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
This medication is used to treat a certain bowel disease (ulcerative colitis).
Compared with Washington prescribers
Dr. Mason wrote 34 prescriptions for Mesalamine, about 1.3 times as often as the typical Washington prescriber of it (27). Medicare paid $482.86 per fill, versus $426.02 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
Ursodiol is used to dissolve certain types of gallstones, to prevent gallstones from forming in obese patients who are losing weight rapidly, and to treat a certain type of liver disease (primary biliary cholangitis).
Compared with Washington prescribers
Dr. Mason wrote 33 prescriptions for Ursodiol, about 1.4 times as often as the typical Washington prescriber of it (24). Medicare paid $89.68 per fill, versus $143.95 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 Washington prescribers
Dr. Mason wrote 22 prescriptions for Ondansetron Odt, about 85% as often as the typical Washington prescriber of it (26). Medicare paid $9.43 per fill, versus $15.16 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
Dicyclomine is used to treat a certain type of intestinal problem called irritable bowel syndrome.
Compared with Washington prescribers
Dr. Mason wrote 21 prescriptions for Dicyclomine Hcl, about as often as the typical Washington prescriber of it (22). Medicare paid $23.30 per fill, versus $20.24 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
Dexlansoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with Washington prescribers
Dr. Mason wrote 20 prescriptions for Dexlansoprazole Dr, about 1.2 times as often as the typical Washington prescriber of it (17). Medicare paid $183.68 per fill, versus $237.80 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 Washington prescribers
Dr. Mason wrote 19 prescriptions for Amitriptyline Hcl, about 86% as often as the typical Washington prescriber of it (22). Medicare paid $5.30 per fill, versus $17.72 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
Sodium picosulfate/magnesium oxide/citric acid solution is used to clean out the intestines before surgery or certain procedures (such as colonoscopy, X-rays).
Compared with Washington prescribers
Dr. Mason wrote 18 prescriptions for Clenpiq, about as often as the typical Washington prescriber of it (18). Medicare paid $171.12 per fill, versus $172.41 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
Prednisone is used to treat conditions such as arthritis, blood disorders, breathing problems, severe allergies, skin diseases, cancer, eye problems, and immune system disorders.
Compared with Washington prescribers
Dr. Mason wrote 18 prescriptions for Prednisone, about half as often as the typical Washington prescriber of it (38). Medicare paid $9.98 per fill, versus $5.30 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
Azathioprine is used to prevent organ rejection in people who have received a kidney transplant.
Compared with Washington prescribers
Dr. Mason wrote 16 prescriptions for Azathioprine, about 71% as often as the typical Washington prescriber of it (23). Medicare paid $47.77 per fill, versus $46.47 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
Esomeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with Washington prescribers
Dr. Mason wrote 15 prescriptions for Esomeprazole Magnesium, about 77% as often as the typical Washington prescriber of it (20). Medicare paid $21.61 per fill, versus $49.86 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
This medication is used to treat a certain bowel disease (ulcerative colitis).
Compared with Washington prescribers
Dr. Mason wrote 15 prescriptions for Mesalamine Er, about 84% as often as the typical Washington prescriber of it (18). Medicare paid $387.34 per fill, versus $178.83 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 Washington prescribers
Dr. Mason wrote 14 prescriptions for Furosemide, about 24% as often as the typical Washington prescriber of it (59). Medicare paid $6.00 per fill, versus $6.29 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 Washington prescribers
Dr. Mason wrote 13 prescriptions for Linzess, about half as often as the typical Washington prescriber of it (25). Medicare paid $1,167.82 per fill, versus $753.76 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
Nadolol is used alone or with other medications to treat high blood pressure (hypertension) and to prevent chest pain (angina).
Compared with Washington prescribers
Dr. Mason wrote 13 prescriptions for Nadolol, about 89% as often as the typical Washington prescriber of it (15). Medicare paid $13.35 per fill, versus $42.53 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 certain bowel disease (ulcerative colitis).
Compared with Washington prescribers
Dr. Mason wrote 12 prescriptions for Mesalamine Dr, about 84% as often as the typical Washington prescriber of it (14). Medicare paid $352.65 per fill, versus $362.45 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 certain bowel disease (ulcerative colitis).
Compared with Washington prescribers
Dr. Mason wrote 11 prescriptions for Pentasa, about 80% as often as the typical Washington prescriber of it (14). Medicare paid $2,118.95 per fill, versus $1,573.75 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. Mason’s prescriptions
What does Dr. Mason prescribe most?
In 2024 Medicare Part D data, Dr. Mason's most prescribed medications were Pantoprazole Sodium (442), Famotidine (82) and Omeprazole (78).
How does Dr. Mason's prescribing compare with other Washington prescribers?
Of the 21 medications with a state comparison, Dr. Mason prescribes 5 more often than the typical Washington prescriber, 12 about as often and 4 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Mason 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 Washington 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.
