PETER M GRINSPOON M.D.
Prescription History 1952560310
Internal Medicine in Chelsea, MA
What does Dr. Grinspoon prescribe?
In 2024, Dr. Grinspoon wrote 990 Medicare prescriptions for 32 medications. The most prescribed was Atorvastatin Calcium, with 136 prescriptions for 47 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. Grinspoon prescribes.
Medications 32 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
Atorvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 136 prescriptions for Atorvastatin Calcium, about 72% as often as the typical Massachusetts prescriber of it (188). Medicare paid $11.14 per fill, versus $13.82 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
Lisinopril is used to treat high blood pressure.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 75 prescriptions for Lisinopril, about 61% as often as the typical Massachusetts prescriber of it (123). Medicare paid $6.44 per fill, versus $8.13 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
Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 61 prescriptions for Metformin Hcl, about 84% as often as the typical Massachusetts prescriber of it (73). Medicare paid $7.97 per fill, versus $9.67 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
Losartan is used to treat high blood pressure (hypertension) and to help protect the kidneys from damage due to diabetes.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 58 prescriptions for Losartan Potassium, about 65% as often as the typical Massachusetts prescriber of it (90). Medicare paid $9.32 per fill, versus $11.50 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 Massachusetts prescribers
Dr. Grinspoon wrote 53 prescriptions for Omeprazole, about half as often as the typical Massachusetts prescriber of it (97). Medicare paid $23.03 per fill, versus $15.75 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 a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 49 prescriptions for Metoprolol Succinate, about half as often as the typical Massachusetts prescriber of it (112). Medicare paid $19.38 per fill, versus $18.15 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
Empagliflozin is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 43 prescriptions for Jardiance, about 87% as often as the typical Massachusetts prescriber of it (49). Medicare paid $1,049.93 per fill, versus $1,010.43 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
Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 40 prescriptions for Metformin Hcl Er, about 78% as often as the typical Massachusetts prescriber of it (52). Medicare paid $11.79 per fill, versus $12.48 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
Dulaglutide is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 37 prescriptions for Trulicity, about 75% as often as the typical Massachusetts prescriber of it (49). Medicare paid $1,074.68 per fill, versus $1,207.77 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 30 prescriptions for Levothyroxine Sodium, about 24% as often as the typical Massachusetts prescriber of it (123). Medicare paid $7.72 per fill, versus $10.45 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
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 Massachusetts prescribers
Dr. Grinspoon wrote 29 prescriptions for Furosemide, about 40% as often as the typical Massachusetts prescriber of it (72). Medicare paid $6.37 per fill, versus $5.71 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
Semaglutide is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 29 prescriptions for Ozempic, about half as often as the typical Massachusetts prescriber of it (51). Medicare paid $1,743.93 per fill, versus $1,217.01 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
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 27 prescriptions for Amlodipine Besylate, about 21% as often as the typical Massachusetts prescriber of it (126). Medicare paid $5.80 per fill, versus $7.46 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
Fluticasone is used to relieve seasonal and year-round allergic and non-allergic nasal symptoms, such as stuffy/runny nose, itching, and sneezing.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 27 prescriptions for Fluticasone Propionate, about 61% as often as the typical Massachusetts prescriber of it (44). Medicare paid $19.94 per fill, versus $16.98 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 Massachusetts prescribers
Dr. Grinspoon wrote 26 prescriptions for Famotidine, about half as often as the typical Massachusetts prescriber of it (46). Medicare paid $19.07 per fill, versus $14.29 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
This medication is used to treat high blood pressure.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 25 prescriptions for Hydrochlorothiazide, about 37% as often as the typical Massachusetts prescriber of it (68). Medicare paid $4.51 per fill, versus $4.39 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 anxiety.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 24 prescriptions for Lorazepam, about 40% as often as the typical Massachusetts prescriber of it (60). Medicare paid $5.58 per fill, versus $6.11 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 contains 2 medicines: buprenorphine and naloxone.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 23 prescriptions for Buprenorphine-Naloxone, about 28% as often as the typical Massachusetts prescriber of it (82). Medicare paid $68.12 per fill, versus $100.54 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 Massachusetts prescribers
Dr. Grinspoon wrote 18 prescriptions for Tramadol Hcl, about 41% as often as the typical Massachusetts prescriber of it (44). Medicare paid $3.62 per fill, versus $6.91 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
Albuterol (also known as salbutamol) is used to prevent and treat wheezing and shortness of breath caused by breathing problems (such as asthma, chronic obstructive pulmonary disease).
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 18 prescriptions for Ventolin Hfa, about half as often as the typical Massachusetts prescriber of it (32). Medicare paid $54.58 per fill, versus $66.79 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
Albuterol (also known as salbutamol) is used to prevent and treat wheezing and shortness of breath caused by breathing problems (such as asthma, chronic obstructive pulmonary disease).
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 17 prescriptions for Albuterol Sulfate Hfa, about 29% as often as the typical Massachusetts prescriber of it (58). Medicare paid $23.47 per fill, versus $31.48 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
Apixaban is used to prevent serious blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip/knee replacement surgery.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 17 prescriptions for Eliquis, about 19% as often as the typical Massachusetts prescriber of it (88). Medicare paid $957.60 per fill, versus $852.50 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 help relieve moderate to severe pain.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 16 prescriptions for Oxycodone Hcl, about 36% as often as the typical Massachusetts prescriber of it (45). Medicare paid $9.82 per fill, versus $12.16 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 14 prescriptions for Gabapentin, about 17% as often as the typical Massachusetts prescriber of it (80). Medicare paid $27.04 per fill, versus $14.49 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 seizure disorders, mental/mood conditions (such as manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 13 prescriptions for Divalproex Sodium Er, about 37% as often as the typical Massachusetts prescriber of it (35). Medicare paid $18.95 per fill, versus $45.87 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 product is used to treat certain types of heart failure.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 13 prescriptions for Entresto, about 26% as often as the typical Massachusetts prescriber of it (50). Medicare paid $736.96 per fill, versus $1,073.16 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
Sitagliptin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 13 prescriptions for Januvia, about 39% as often as the typical Massachusetts prescriber of it (33). Medicare paid $1,409.55 per fill, versus $854.42 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
Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 13 prescriptions for Zolpidem Tartrate, about 35% as often as the typical Massachusetts prescriber of it (37). Medicare paid $8.98 per fill, versus $5.91 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 Massachusetts prescribers
Dr. Grinspoon wrote 12 prescriptions for Ondansetron Odt, about half as often as the typical Massachusetts prescriber of it (22). Medicare paid $2.61 per fill, versus $15.13 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
Rosuvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 12 prescriptions for Rosuvastatin Calcium, about 15% as often as the typical Massachusetts prescriber of it (79). Medicare paid $12.55 per fill, versus $28.16 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
Diazepam is used to treat anxiety, alcohol withdrawal, and seizures.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 11 prescriptions for Diazepam, about 41% as often as the typical Massachusetts prescriber of it (27). Medicare paid $5.84 per fill, versus $6.39 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
Compared with Massachusetts prescribers
Dr. Grinspoon wrote 11 prescriptions for Nano 2nd Gen Pen Needle, about 27% as often as the typical Massachusetts prescriber of it (41). Medicare paid $64.26 per fill, versus $95.64 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. Grinspoon’s prescriptions
What does Dr. Grinspoon prescribe most?
In 2024 Medicare Part D data, Dr. Grinspoon's most prescribed medications were Atorvastatin Calcium (136), Lisinopril (75) and Metformin Hcl (61).
How does Dr. Grinspoon's prescribing compare with other Massachusetts prescribers?
Of the 32 medications with a state comparison, Dr. Grinspoon prescribes 4 about as often than the typical Massachusetts prescriber and 28 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Grinspoon 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.
