WILLIAM MATOS-SANTIAGO M.D.
Prescription History 1477536498
Internal Medicine - Rheumatology in San Juan, PR
What does Dr. Matos-Santiago prescribe?
In 2024, Dr. Matos-Santiago wrote 2,920 Medicare prescriptions for 51 medications. The most prescribed was Methotrexate (methotrexate sodium), with 582 prescriptions for 126 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. Matos-Santiago prescribes.
Medications 51 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 Puerto Rico prescribers.
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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 582 prescriptions for Methotrexate, about 7.6 times as often as the typical Puerto Rico prescriber of it (77). Medicare paid $16.06 per fill, versus $15.27 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
See also Warning section.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 336 prescriptions for Diclofenac Sodium, about 4.9 times as often as the typical Puerto Rico prescriber of it (69). Medicare paid $17.09 per fill, versus $16.14 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
Adalimumab is used to reduce pain and swelling due to certain types of arthritis (such as rheumatoid, psoriatic, juvenile idiopathic, ankylosing spondylitis).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 243 prescriptions for Humira(Cf) Pen, about 3.1 times as often as the typical Puerto Rico prescriber of it (78). Medicare paid $6,902.48 per fill, versus $7,249.15 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
See also Warning section.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 190 prescriptions for Sulindac, about 4 times as often as the typical Puerto Rico prescriber of it (47). Medicare paid $27.01 per fill, versus $16.52 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 144 prescriptions for Alendronate Sodium, about 1.2 times as often as the typical Puerto Rico prescriber of it (118). Medicare paid $8.46 per fill, versus $7.83 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 119 prescriptions for Gabapentin, about half as often as the typical Puerto Rico prescriber of it (262). Medicare paid $12.54 per fill, versus $9.88 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 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 118 prescriptions for Enbrel Sureclick, about 1.4 times as often as the typical Puerto Rico prescriber of it (82). Medicare paid $7,350.79 per fill, versus $7,445.10 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
Ibandronate is used to prevent and treat certain types of bone loss (osteoporosis).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 117 prescriptions for Ibandronate Sodium, about 2.7 times as often as the typical Puerto Rico prescriber of it (44). Medicare paid $26.55 per fill, versus $25.54 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 81 prescriptions for Synthroid, about 35% as often as the typical Puerto Rico prescriber of it (233). Medicare paid $54.91 per fill, versus $76.31 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
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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 70 prescriptions for Atorvastatin Calcium, about 21% as often as the typical Puerto Rico prescriber of it (337). Medicare paid $6.89 per fill, versus $10.05 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 nonsteroidal anti-inflammatory drug (NSAID), specifically a COX-2 inhibitor, which relieves pain and swelling (inflammation).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 57 prescriptions for Celecoxib, about 1.7 times as often as the typical Puerto Rico prescriber of it (33). Medicare paid $20.50 per fill, versus $16.21 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 53 prescriptions for Pantoprazole Sodium, about 37% as often as the typical Puerto Rico prescriber of it (142). Medicare paid $9.14 per fill, versus $8.42 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
Meloxicam is used to treat arthritis.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 47 prescriptions for Meloxicam, about 62% as often as the typical Puerto Rico prescriber of it (76). Medicare paid $5.11 per fill, versus $4.51 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
Nabumetone is used to reduce pain, swelling, and joint stiffness from arthritis.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 43 prescriptions for Nabumetone, about 74% as often as the typical Puerto Rico prescriber of it (58). Medicare paid $25.90 per fill, versus $15.60 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 skin conditions such as eczema, psoriasis, allergies, and rash.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 42 prescriptions for Mometasone Furoate, about as often as the typical Puerto Rico prescriber of it (37). Medicare paid $27.24 per fill, versus $29.32 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
Folic acid is the man-made form of folate.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 41 prescriptions for Folic Acid, about 1.4 times as often as the typical Puerto Rico prescriber of it (30). Medicare paid $4.70 per fill, versus $5.19 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 35 prescriptions for Metformin Hcl, about 17% as often as the typical Puerto Rico prescriber of it (204). Medicare paid $6.99 per fill, versus $6.34 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
Upadacitinib is used to treat certain types of arthritis (such as psoriatic arthritis, rheumatoid arthritis, axial spondyloarthritis, polyarticular juvenile idiopathic arthritis- pJIA).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 30 prescriptions for Rinvoq, about half as often as the typical Puerto Rico prescriber of it (51). Medicare paid $6,471.25 per fill, versus $6,523.15 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
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 25 prescriptions for Amlodipine Besylate, about 12% as often as the typical Puerto Rico prescriber of it (210). Medicare paid $3.03 per fill, versus $5.10 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 25 prescriptions for Naproxen, about 61% as often as the typical Puerto Rico prescriber of it (41). Medicare paid $9.54 per fill, versus $7.54 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
This medication is used to treat rheumatoid arthritis, a condition in which the body's own defense system (immune system) attacks healthy tissue.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 24 prescriptions for Orencia, about 79% as often as the typical Puerto Rico prescriber of it (31). Medicare paid $5,661.36 per fill, versus $5,744.19 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 24 prescriptions for Prednisone, about 39% as often as the typical Puerto Rico prescriber of it (62). Medicare paid $6.72 per fill, versus $5.11 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 is used to treat a variety of skin conditions (such as eczema, dermatitis, allergies, rash).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 23 prescriptions for Betamethasone Diprop Augmented, about 39% as often as the typical Puerto Rico prescriber of it (59). Medicare paid $91.41 per fill, versus $41.10 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
Fenofibrate 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 23 prescriptions for Fenofibrate, about 71% as often as the typical Puerto Rico prescriber of it (32). Medicare paid $22.93 per fill, versus $31.01 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
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 23 prescriptions for Omeprazole, about 15% as often as the typical Puerto Rico prescriber of it (158). Medicare paid $6.10 per fill, versus $6.77 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
Gemfibrozil is used along with a proper diet to help lower fats (triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 22 prescriptions for Gemfibrozil, about 71% as often as the typical Puerto Rico prescriber of it (31). Medicare paid $10.01 per fill, versus $15.52 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 22 prescriptions for Losartan Potassium, about 9% as often as the typical Puerto Rico prescriber of it (247). Medicare paid $6.78 per fill, versus $10.77 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
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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 20 prescriptions for Enbrel, about half as often as the typical Puerto Rico prescriber of it (37). Medicare paid $7,365.15 per fill, versus $7,402.19 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 drug is used to treat high blood pressure.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 20 prescriptions for Losartan-Hydrochlorothiazide, about 26% as often as the typical Puerto Rico prescriber of it (77). Medicare paid $14.36 per fill, versus $17.55 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 muscle spasms caused by certain conditions (such as multiple sclerosis, spinal cord injury).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 20 prescriptions for Tizanidine Hcl, about 24% as often as the typical Puerto Rico prescriber of it (82). Medicare paid $5.22 per fill, versus $7.33 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 an overactive bladder.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 19 prescriptions for Tolterodine Tartrate Er, about half as often as the typical Puerto Rico prescriber of it (45). Medicare paid $34.05 per fill, versus $71.74 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 plaque psoriasis and certain types of arthritis (psoriatic arthritis, ankylosing spondylitis, axial spondyloarthritis).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 18 prescriptions for Taltz Autoinjector, about half as often as the typical Puerto Rico prescriber of it (31). Medicare paid $6,775.05 per fill, versus $7,018.45 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
Tofacitinib is used to treat certain types of arthritis (such as psoriatic arthritis, rheumatoid arthritis, ankylosing spondylitis).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 18 prescriptions for Xeljanz Xr, about 37% as often as the typical Puerto Rico prescriber of it (48). Medicare paid $5,797.46 per fill, versus $5,914.78 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 16 prescriptions for Hydroxychloroquine Sulfate, about 27% as often as the typical Puerto Rico prescriber of it (60). Medicare paid $52.14 per fill, versus $30.86 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
Methylprednisolone is used to treat conditions such as arthritis, blood disorders, severe allergic reactions, certain cancers, eye conditions, skin/kidney/intestinal/lung diseases, and immune system disorders.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 16 prescriptions for Methylprednisolone, about 34% as often as the typical Puerto Rico prescriber of it (48). Medicare paid $24.94 per fill, versus $10.03 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 rheumatoid arthritis, a condition in which the body's own defense system (immune system) attacks healthy tissue.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 16 prescriptions for Orencia Clickject, about 23% as often as the typical Puerto Rico prescriber of it (69). Medicare paid $5,758.72 per fill, versus $5,711.73 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 combination medication is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 15 prescriptions for Janumet, about 38% as often as the typical Puerto Rico prescriber of it (39). Medicare paid $655.79 per fill, versus $779.20 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
Simvastatin 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 15 prescriptions for Simvastatin, about 8% as often as the typical Puerto Rico prescriber of it (193). Medicare paid $5.50 per fill, versus $7.24 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
See also Warning section.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Etodolac, about 29% as often as the typical Puerto Rico prescriber of it (48). Medicare paid $45.28 per fill, versus $25.10 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
Glimepiride is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Glimepiride, about 14% as often as the typical Puerto Rico prescriber of it (101). Medicare paid $14.96 per fill, versus $15.37 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
Irbesartan is used to treat high blood pressure (hypertension) and to help protect the kidneys from damage due to diabetes.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Irbesartan, about 17% as often as the typical Puerto Rico prescriber of it (81). Medicare paid $29.61 per fill, versus $26.55 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
Denosumab is used to treat bone loss (osteoporosis) in people who have a high risk of getting fractures.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Prolia, about 30% as often as the typical Puerto Rico prescriber of it (47). Medicare paid $1,736.95 per fill, versus $1,766.92 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Raloxifene Hcl, about half as often as the typical Puerto Rico prescriber of it (33). Medicare paid $86.92 per fill, versus $47.49 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
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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 14 prescriptions for Rosuvastatin Calcium, about 8% as often as the typical Puerto Rico prescriber of it (185). Medicare paid $10.63 per fill, versus $12.35 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 Puerto Rico prescribers
Dr. Matos-Santiago wrote 13 prescriptions for Famotidine, about 6% as often as the typical Puerto Rico prescriber of it (204). Medicare paid $8.19 per fill, versus $7.25 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 a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 13 prescriptions for Metoprolol Succinate, about 7% as often as the typical Puerto Rico prescriber of it (176). Medicare paid $12.36 per fill, versus $15.32 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 reduce pain and swelling due to certain types of arthritis (such as rheumatoid, psoriatic, and ankylosing spondylitis).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 13 prescriptions for Simponi, about half as often as the typical Puerto Rico prescriber of it (30). Medicare paid $6,077.53 per fill, versus $6,138.49 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 mental/mood disorders (such as depression, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 12 prescriptions for Sertraline Hcl, about 9% as often as the typical Puerto Rico prescriber of it (138). Medicare paid $13.82 per fill, versus $7.04 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
Allopurinol is used to treat gout and certain types of kidney stones.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 11 prescriptions for Allopurinol, about 18% as often as the typical Puerto Rico prescriber of it (60). Medicare paid $10.93 per fill, versus $8.75 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 used to treat symptoms of dry mouth due to a certain immune disease (Sjogren's syndrome).
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 11 prescriptions for Cevimeline Hcl, about 36% as often as the typical Puerto Rico prescriber of it (31). Medicare paid $131.70 per fill, versus $104.71 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
See also Warning section.
Compared with Puerto Rico prescribers
Dr. Matos-Santiago wrote 11 prescriptions for Tramadol Hcl, about 22% as often as the typical Puerto Rico prescriber of it (51). Medicare paid $7.13 per fill, versus $6.25 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. Matos-Santiago’s prescriptions
What does Dr. Matos-Santiago prescribe most?
In 2024 Medicare Part D data, Dr. Matos-Santiago's most prescribed medications were Methotrexate (582), Diclofenac Sodium (336) and Humira(Cf) Pen (243).
How does Dr. Matos-Santiago's prescribing compare with other Puerto Rico prescribers?
Of the 51 medications with a state comparison, Dr. Matos-Santiago prescribes 8 more often than the typical Puerto Rico prescriber, 3 about as often and 40 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Matos-Santiago 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 Puerto Rico 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.
