RYAN CHANG
Prescription History 1164985263
Internal Medicine - Medical Oncology in San Mateo, CA
What does Ryan Chang prescribe?
In 2024, Ryan Chang wrote 29 Medicare prescriptions for 2 medications. The most prescribed was Prednisone, with 15 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 Ryan Chang prescribes.
Medications 2 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
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
Ryan Chang wrote 15 prescriptions for Prednisone, about 37% as often as the typical California prescriber of it (40). Medicare paid $7.15 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
Ryan Chang wrote 14 prescriptions for Abiraterone Acetate, about 24% as often as the typical California prescriber of it (59). Medicare paid $184.74 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.
Questions about Ryan Chang’s prescriptions
What does Ryan Chang prescribe most?
In 2024 Medicare Part D data, Ryan Chang's most prescribed medications were Prednisone (15) and Abiraterone Acetate (14).
How does Ryan Chang's prescribing compare with other California prescribers?
Of the 2 medications with a state comparison, Ryan Chang prescribes 2 less often than the typical California prescriber. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Ryan Chang 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.
