JOHN D AYERS MD
Prescription History 1477540821
Internal Medicine - Hematology & Oncology in Warrenville, IL
What does Dr. Ayers prescribe?
In 2024, Dr. Ayers wrote 912 Medicare prescriptions for 16 medications. The most prescribed was Tamoxifen Citrate, with 255 prescriptions for 89 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. Ayers prescribes.
Medications 16 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 Illinois prescribers.
What it is used for
Tamoxifen is used to treat breast cancer.
Compared with Illinois prescribers
Dr. Ayers wrote 255 prescriptions for Tamoxifen Citrate, about 7.3 times as often as the typical Illinois prescriber of it (35). Medicare paid $25.47 per fill, versus $23.49 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 certain types of breast cancer (such as hormone-receptor-positive breast cancer) in women after menopause.
Compared with Illinois prescribers
Dr. Ayers wrote 126 prescriptions for Letrozole, about 2.3 times as often as the typical Illinois prescriber of it (56). Medicare paid $27.95 per fill, versus $19.02 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
Raloxifene is used by women to prevent and treat bone loss (osteoporosis) after menopause.
Compared with Illinois prescribers
Dr. Ayers wrote 124 prescriptions for Raloxifene Hcl, about 5.6 times as often as the typical Illinois prescriber of it (22). Medicare paid $49.02 per fill, versus $40.63 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
Anastrozole is used to treat breast cancer in women after menopause.
Compared with Illinois prescribers
Dr. Ayers wrote 121 prescriptions for Anastrozole, about 1.6 times as often as the typical Illinois prescriber of it (76). Medicare paid $17.48 per fill, versus $17.15 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
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 Illinois prescribers
Dr. Ayers wrote 76 prescriptions for Eliquis, about 81% as often as the typical Illinois prescriber of it (94). Medicare paid $1,100.35 per fill, versus $848.57 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 Illinois prescribers
Dr. Ayers wrote 42 prescriptions for Prochlorperazine Maleate, about 1.3 times as often as the typical Illinois prescriber of it (34). Medicare paid $7.54 per fill, versus $10.63 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
Rivaroxaban is used to prevent blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip or knee replacement surgery.
Compared with Illinois prescribers
Dr. Ayers wrote 27 prescriptions for Xarelto, about half as often as the typical Illinois prescriber of it (47). Medicare paid $1,168.34 per fill, versus $923.03 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 types of breast cancer (such as hormone-receptor-positive breast cancer) in women after menopause.
Compared with Illinois prescribers
Dr. Ayers wrote 22 prescriptions for Exemestane, about 75% as often as the typical Illinois prescriber of it (29). Medicare paid $115.59 per fill, versus $174.13 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
This medication is used by people with sickle cell anemia to reduce the number of painful crises caused by the disease and to reduce the need for blood transfusions.
Compared with Illinois prescribers
Dr. Ayers wrote 20 prescriptions for Hydroxyurea, about half as often as the typical Illinois prescriber of it (36). Medicare paid $22.61 per fill, versus $21.27 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 certain types of breast cancer.
Compared with Illinois prescribers
Dr. Ayers wrote 20 prescriptions for Verzenio, about as often as the typical Illinois prescriber of it (19). Medicare paid $15,212.83 per fill, versus $14,327.17 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
Alendronate is used to prevent and treat certain types of bone loss (osteoporosis) in adults.
Compared with Illinois prescribers
Dr. Ayers wrote 15 prescriptions for Alendronate Sodium, about 30% as often as the typical Illinois prescriber of it (49). Medicare paid $2.66 per fill, versus $8.38 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
Dexamethasone is used to treat conditions such as arthritis, blood/hormone disorders, allergic reactions, skin diseases, eye problems, breathing problems, bowel disorders, cancer, and immune system disorders.
Compared with Illinois prescribers
Dr. Ayers wrote 14 prescriptions for Dexamethasone, about 41% as often as the typical Illinois prescriber of it (34). Medicare paid $22.90 per fill, versus $12.06 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 Illinois prescribers
Dr. Ayers wrote 14 prescriptions for Ondansetron Odt, about half as often as the typical Illinois prescriber of it (24). Medicare paid $14.88 per fill, versus $12.49 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Illinois prescribers
Dr. Ayers wrote 12 prescriptions for Gabapentin, about 14% as often as the typical Illinois prescriber of it (87). Medicare paid $25.56 per fill, versus $15.83 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 Illinois prescribers
Dr. Ayers wrote 12 prescriptions for Prednisone, about 26% as often as the typical Illinois prescriber of it (46). Medicare paid $5.45 per fill, versus $3.88 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
This medication is used to treat low platelet levels in people who have a certain blood disorder called chronic immune (idiopathic) thrombocytopenia purpura (ITP) or who have chronic hepatitis C.
Compared with Illinois prescribers
Dr. Ayers wrote 12 prescriptions for Promacta, about 67% as often as the typical Illinois prescriber of it (18). Medicare paid $7,308.92 per fill, versus $14,194.32 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. Ayers’s prescriptions
What does Dr. Ayers prescribe most?
In 2024 Medicare Part D data, Dr. Ayers's most prescribed medications were Tamoxifen Citrate (255), Letrozole (126) and Raloxifene Hcl (124).
How does Dr. Ayers's prescribing compare with other Illinois prescribers?
Of the 16 medications with a state comparison, Dr. Ayers prescribes 5 more often than the typical Illinois prescriber, 3 about as often and 8 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Ayers 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 Illinois 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.
