AARON MASAYUKI TSUMURA MD
Prescription History 1982165213
Internal Medicine - Hematology & Oncology in Sacramento, CA
What does Dr. Tsumura prescribe?
In 2024, Dr. Tsumura wrote 142 Medicare prescriptions for 9 medications. The most prescribed was Sprycel (dasatinib), with 38 prescriptions.
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. Tsumura prescribes.
Medications 9 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
This medication is used to treat certain types of cancer (chronic myeloid leukemia-CML, acute lymphoblastic leukemia-ALL).
Compared with California prescribers
Dr. Tsumura wrote 38 prescriptions for Sprycel, about 2 times as often as the typical California prescriber of it (19). Medicare paid $8,928.02 per fill, versus $11,918.15 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Dr. Tsumura wrote 16 prescriptions for Gabapentin, about 20% as often as the typical California prescriber of it (80). Medicare paid $17.24 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
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 California prescribers
Dr. Tsumura wrote 15 prescriptions for Prednisone, about 37% as often as the typical California prescriber of it (40). Medicare paid $0.88 per fill, versus $5.64 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 prostate cancer.
Compared with California prescribers
Dr. Tsumura wrote 14 prescriptions for Abiraterone Acetate, about 24% as often as the typical California prescriber of it (59). Medicare paid $3,211.79 per fill, versus $1,101.95 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
Cyclobenzaprine is used short-term to treat muscle spasms.
Compared with California prescribers
Dr. Tsumura wrote 13 prescriptions for Cyclobenzaprine Hcl, about 40% as often as the typical California prescriber of it (32). Medicare paid $18.29 per fill, versus $8.89 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
This medication is used to treat depression.
Compared with California prescribers
Dr. Tsumura wrote 12 prescriptions for Bupropion Hcl, about half as often as the typical California prescriber of it (20). Medicare paid $10.66 per fill, versus $23.39 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 to treat certain cancers (such as chronic lymphocytic leukemia/small lymphocytic lymphoma, Waldenstrom's macroglobulinemia).
Compared with California prescribers
Dr. Tsumura wrote 12 prescriptions for Imbruvica, about half as often as the typical California prescriber of it (25). Medicare paid $14,421.84 per fill, versus $15,720.46 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
Acyclovir is used to treat infections caused by certain types of viruses.
Compared with California prescribers
Dr. Tsumura wrote 11 prescriptions for Acyclovir, about half as often as the typical California prescriber of it (25). Medicare paid $7.48 per fill, versus $18.27 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 severe nausea and vomiting from certain causes (for example, after surgery or cancer treatment).
Compared with California prescribers
Dr. Tsumura wrote 11 prescriptions for Prochlorperazine Maleate, about 38% as often as the typical California prescriber of it (29). Medicare paid $9.17 per fill, versus $13.81 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. Tsumura’s prescriptions
What does Dr. Tsumura prescribe most?
In 2024 Medicare Part D data, Dr. Tsumura's most prescribed medications were Sprycel (38), Gabapentin (16) and Prednisone (15).
How does Dr. Tsumura's prescribing compare with other California prescribers?
Of the 9 medications with a state comparison, Dr. Tsumura prescribes 1 more often than the typical California prescriber and 8 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Tsumura 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.
