DR. ERIN J LEAHY M.D.
Prescription History 1235339607
Internal Medicine - Geriatric Medicine in Springfield, MA
What does Dr. Leahy prescribe?
In 2024, Dr. Leahy wrote 532 Medicare prescriptions for 7 medications. The most prescribed was Donepezil Hcl, with 199 prescriptions for 52 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. Leahy prescribes.
Medications 7 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
Donepezil is used to treat confusion (dementia) related to Alzheimer's disease.
Compared with Massachusetts prescribers
Dr. Leahy wrote 199 prescriptions for Donepezil Hcl, about 3.7 times as often as the typical Massachusetts prescriber of it (54). Medicare paid $6.93 per fill, versus $12.88 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
Memantine is used to treat moderate to severe confusion (dementia) related to Alzheimer's disease.
Compared with Massachusetts prescribers
Dr. Leahy wrote 195 prescriptions for Memantine Hcl, about 4 times as often as the typical Massachusetts prescriber of it (49). Medicare paid $21.21 per fill, versus $36.22 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 certain mental/mood disorders (such as depression, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder).
Compared with Massachusetts prescribers
Dr. Leahy wrote 69 prescriptions for Sertraline Hcl, about as often as the typical Massachusetts prescriber of it (62). Medicare paid $8.17 per fill, versus $10.02 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 bipolar disorder, schizophrenia, Tourette's syndrome, and irritability associated with autistic disorder).
Compared with Massachusetts prescribers
Dr. Leahy wrote 28 prescriptions for Aripiprazole, about 62% as often as the typical Massachusetts prescriber of it (45). Medicare paid $16.98 per fill, versus $72.25 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
This medication is used to treat depression.
Compared with Massachusetts prescribers
Dr. Leahy wrote 19 prescriptions for Mirtazapine, about 37% as often as the typical Massachusetts prescriber of it (51). Medicare paid $18.62 per fill, versus $19.68 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
This medication is used to treat certain mental/mood disorders (such as depression, anxiety).
Compared with Massachusetts prescribers
Dr. Leahy wrote 11 prescriptions for Escitalopram Oxalate, about 24% as often as the typical Massachusetts prescriber of it (46). Medicare paid $4.97 per fill, versus $13.27 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 depression.
Compared with Massachusetts prescribers
Dr. Leahy wrote 11 prescriptions for Trazodone Hcl, about 15% as often as the typical Massachusetts prescriber of it (72). Medicare paid $13.49 per fill, versus $9.86 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. Leahy’s prescriptions
What does Dr. Leahy prescribe most?
In 2024 Medicare Part D data, Dr. Leahy's most prescribed medications were Donepezil Hcl (199), Memantine Hcl (195) and Sertraline Hcl (69).
How does Dr. Leahy's prescribing compare with other Massachusetts prescribers?
Of the 7 medications with a state comparison, Dr. Leahy prescribes 2 more often than the typical Massachusetts prescriber, 1 about as often and 4 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Leahy 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.
