MS. WENDY CRISTINA PERDOMO PENA M.D.
Prescription History 1659934412
Internal Medicine - Rheumatology in Mountain View, CA
What does Dr. Perdomo Pena prescribe?
In 2024, Dr. Perdomo Pena wrote 239 Medicare prescriptions for 10 medications. The most prescribed was Prednisone, with 56 prescriptions for 24 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. Perdomo Pena prescribes.
Medications 10 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
Dr. Perdomo Pena wrote 56 prescriptions for Prednisone, about 1.4 times as often as the typical California prescriber of it (40). Medicare paid $7.67 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
Hydroxychloroquine is used to prevent or treat malaria caused by mosquito bites.
Compared with California prescribers
Dr. Perdomo Pena wrote 37 prescriptions for Hydroxychloroquine Sulfate, about 40% as often as the typical California prescriber of it (93). Medicare paid $45.45 per fill, versus $38.65 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
Methotrexate is used to treat certain types of cancer (such as acute lymphoblastic leukemia, non-Hodgkin's lymphoma), severe psoriasis that has not responded to other treatments, or rheumatoid arthritis.
Compared with California prescribers
Dr. Perdomo Pena wrote 25 prescriptions for Methotrexate, about 26% as often as the typical California prescriber of it (95). Medicare paid $14.98 per fill, versus $24.82 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
See also Warning section.
Compared with California prescribers
Dr. Perdomo Pena wrote 20 prescriptions for Diclofenac Sodium, about half as often as the typical California prescriber of it (47). Medicare paid $31.35 per fill, versus $107.23 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 rheumatoid arthritis in adults and in children (such as polyarticular juvenile idiopathic arthritis-PJIA, systemic juvenile idiopathic arthritis-SJIA).
Compared with California prescribers
Dr. Perdomo Pena wrote 19 prescriptions for Actemra Actpen, about 86% as often as the typical California prescriber of it (22). Medicare paid $5,192.64 per fill, versus $3,792.24 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
Mycophenolate is used in combination with other medications to keep your body from attacking and rejecting your transplanted organ (such as kidney, liver, heart).
Compared with California prescribers
Dr. Perdomo Pena wrote 19 prescriptions for Mycophenolate Mofetil, about 66% as often as the typical California prescriber of it (29). Medicare paid $860.00 per fill, versus $132.62 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 California prescribers
Dr. Perdomo Pena wrote 17 prescriptions for Omeprazole, about 22% as often as the typical California prescriber of it (78). Medicare paid $14.19 per fill, versus $11.26 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 in combination with an immunosuppressant (such as methotrexate) to treat certain types of arthritis (such as rheumatoid, psoriatic, juvenile idiopathic, and ankylosing spondylitis).
Compared with California prescribers
Dr. Perdomo Pena wrote 16 prescriptions for Enbrel Sureclick, about 35% as often as the typical California prescriber of it (45). Medicare paid $8,731.93 per fill, versus $7,198.08 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 California prescribers
Dr. Perdomo Pena wrote 15 prescriptions for Alendronate Sodium, about 25% as often as the typical California prescriber of it (61). Medicare paid $11.08 per fill, versus $9.65 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
Pantoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with California prescribers
Dr. Perdomo Pena wrote 15 prescriptions for Pantoprazole Sodium, about 23% as often as the typical California prescriber of it (65). Medicare paid $24.03 per fill, versus $13.87 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. Perdomo Pena’s prescriptions
What does Dr. Perdomo Pena prescribe most?
In 2024 Medicare Part D data, Dr. Perdomo Pena's most prescribed medications were Prednisone (56), Hydroxychloroquine Sulfate (37) and Methotrexate (25).
How does Dr. Perdomo Pena's prescribing compare with other California prescribers?
Of the 10 medications with a state comparison, Dr. Perdomo Pena prescribes 1 more often than the typical California prescriber, 1 about as often and 8 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Perdomo Pena 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.
