DR. DAVID MARSHALL HARRIS MD
Prescription History 1255865796
Radiology - Radiation Oncology in Worcester, MA
What does Dr. Harris prescribe?
In 2024, Dr. Harris wrote 98 Medicare prescriptions for 3 medications. The most prescribed was Tamsulosin Hcl, with 67 prescriptions for 36 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. Harris prescribes.
Medications 3 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 Massachusetts prescribers.
What it is used for
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with Massachusetts prescribers
Dr. Harris wrote 67 prescriptions for Tamsulosin Hcl, about 86% as often as the typical Massachusetts prescriber of it (78). Medicare paid $15.70 per fill, versus $17.30 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
Oxybutynin is used to treat certain bladder and urinary conditions (such as overactive bladder).
Compared with Massachusetts prescribers
Dr. Harris wrote 19 prescriptions for Oxybutynin Chloride, about 75% as often as the typical Massachusetts prescriber of it (25). Medicare paid $12.84 per fill, versus $15.53 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
Finasteride is used to shrink an enlarged prostate (benign prostatic hyperplasia or BPH) in adult men.
Compared with Massachusetts prescribers
Dr. Harris wrote 12 prescriptions for Finasteride, about 21% as often as the typical Massachusetts prescriber of it (57). Medicare paid $13.13 per fill, versus $15.17 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. Harris’s prescriptions
What does Dr. Harris prescribe most?
In 2024 Medicare Part D data, Dr. Harris's most prescribed medications were Tamsulosin Hcl (67), Oxybutynin Chloride (19) and Finasteride (12).
How does Dr. Harris's prescribing compare with other Massachusetts prescribers?
Of the 3 medications with a state comparison, Dr. Harris prescribes 1 about as often than the typical Massachusetts prescriber and 2 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Harris 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 Massachusetts 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.
