YINCHONG ERICA MAK MD
Prescription History 1982930491
Internal Medicine in Palo Alto, CA
What does Dr. Mak prescribe?
In 2024, Dr. Mak wrote 1,967 Medicare prescriptions for 52 medications. The most prescribed was Atorvastatin Calcium, with 267 prescriptions for 76 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. Mak prescribes.
Medications 52 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
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 California prescribers
Dr. Mak wrote 267 prescriptions for Atorvastatin Calcium, about 1.3 times as often as the typical California prescriber of it (202). Medicare paid $10.69 per fill, versus $10.47 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 California prescribers
Dr. Mak wrote 193 prescriptions for Amlodipine Besylate, about 1.4 times as often as the typical California prescriber of it (141). Medicare paid $7.28 per fill, versus $7.08 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with California prescribers
Dr. Mak wrote 115 prescriptions for Levothyroxine Sodium, about as often as the typical California prescriber of it (125). Medicare paid $16.99 per fill, versus $13.30 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 California prescribers
Dr. Mak wrote 112 prescriptions for Losartan Potassium, about as often as the typical California prescriber of it (121). Medicare paid $10.35 per fill, versus $10.35 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Dr. Mak wrote 82 prescriptions for Gabapentin, about as often as the typical California prescriber of it (80). Medicare paid $23.39 per fill, versus $15.63 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
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 California prescribers
Dr. Mak wrote 59 prescriptions for Simvastatin, about as often as the typical California prescriber of it (63). Medicare paid $14.60 per fill, versus $9.03 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
Lisinopril is used to treat high blood pressure.
Compared with California prescribers
Dr. Mak wrote 58 prescriptions for Lisinopril, about half as often as the typical California prescriber of it (98). Medicare paid $9.11 per fill, versus $8.30 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
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with California prescribers
Dr. Mak wrote 53 prescriptions for Tamsulosin Hcl, about 63% as often as the typical California prescriber of it (84). Medicare paid $22.66 per fill, versus $15.02 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 high blood pressure.
Compared with California prescribers
Dr. Mak wrote 52 prescriptions for Hydrochlorothiazide, about 84% as often as the typical California prescriber of it (62). Medicare paid $2.56 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
This medication is used to treat depression.
Compared with California prescribers
Dr. Mak wrote 52 prescriptions for Trazodone Hcl, about as often as the typical California prescriber of it (57). Medicare paid $27.16 per fill, versus $9.93 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 California prescribers
Dr. Mak wrote 51 prescriptions for Metformin Hcl Er, about as often as the typical California prescriber of it (55). Medicare paid $13.76 per fill, versus $9.99 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 California prescribers
Dr. Mak wrote 51 prescriptions for Rosuvastatin Calcium, about half as often as the typical California prescriber of it (101). Medicare paid $26.02 per fill, versus $15.64 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
This medication is a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with California prescribers
Dr. Mak wrote 43 prescriptions for Metoprolol Succinate, about half as often as the typical California prescriber of it (86). Medicare paid $20.77 per fill, versus $14.23 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
Alendronate is used to prevent and treat certain types of bone loss (osteoporosis) in adults.
Compared with California prescribers
Dr. Mak wrote 39 prescriptions for Alendronate Sodium, about 64% as often as the typical California prescriber of it (61). Medicare paid $8.85 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
This medication is used to treat anxiety.
Compared with California prescribers
Dr. Mak wrote 33 prescriptions for Lorazepam, about 77% as often as the typical California prescriber of it (43). Medicare paid $7.71 per fill, versus $6.52 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
Chlorthalidone is used to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Mak wrote 31 prescriptions for Chlorthalidone, about 1.2 times as often as the typical California prescriber of it (26). Medicare paid $8.69 per fill, versus $15.58 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 California prescribers
Dr. Mak wrote 31 prescriptions for Metformin Hcl, about 31% as often as the typical California prescriber of it (100). Medicare paid $8.28 per fill, versus $9.26 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 to treat depression.
Compared with California prescribers
Dr. Mak wrote 30 prescriptions for Bupropion Xl, about 85% as often as the typical California prescriber of it (35). Medicare paid $29.23 per fill, versus $25.68 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
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 California prescribers
Dr. Mak wrote 29 prescriptions for Eliquis, about 40% as often as the typical California prescriber of it (73). Medicare paid $1,545.06 per fill, versus $923.33 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
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 California prescribers
Dr. Mak wrote 26 prescriptions for Famotidine, about half as often as the typical California prescriber of it (54). Medicare paid $13.92 per fill, versus $12.66 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 California prescribers
Dr. Mak wrote 25 prescriptions for Allopurinol, about half as often as the typical California prescriber of it (44). Medicare paid $17.17 per fill, versus $10.39 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
Clopidogrel is used to prevent heart attacks and strokes in persons with heart disease (recent heart attack), recent stroke, or blood circulation disease (peripheral vascular disease).
Compared with California prescribers
Dr. Mak wrote 25 prescriptions for Clopidogrel, about half as often as the typical California prescriber of it (48). Medicare paid $10.99 per fill, versus $12.42 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
This medication is used to treat depression.
Compared with California prescribers
Dr. Mak wrote 24 prescriptions for Citalopram Hbr, about 81% as often as the typical California prescriber of it (30). Medicare paid $4.43 per fill, versus $8.24 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
This combination medication is used to relieve moderate to severe pain.
Compared with California prescribers
Dr. Mak wrote 24 prescriptions for Hydrocodone-Acetaminophen, about 32% as often as the typical California prescriber of it (76). Medicare paid $15.29 per fill, versus $21.39 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 depression.
Compared with California prescribers
Dr. Mak wrote 22 prescriptions for Amitriptyline Hcl, about 89% as often as the typical California prescriber of it (25). Medicare paid $13.43 per fill, versus $14.34 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
This medication is a nonsteroidal anti-inflammatory drug (NSAID), specifically a COX-2 inhibitor, which relieves pain and swelling (inflammation).
Compared with California prescribers
Dr. Mak wrote 22 prescriptions for Celecoxib, about half as often as the typical California prescriber of it (46). Medicare paid $93.35 per fill, versus $32.27 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
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 California prescribers
Dr. Mak wrote 21 prescriptions for Albuterol Sulfate Hfa, about 36% as often as the typical California prescriber of it (58). Medicare paid $25.06 per fill, versus $28.70 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
Ipratropium is used to treat a runny nose caused by the common cold or seasonal allergies.
Compared with California prescribers
Dr. Mak wrote 21 prescriptions for Ipratropium Bromide, about 60% as often as the typical California prescriber of it (35). Medicare paid $21.33 per fill, versus $31.19 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 medication is a mineral supplement used to treat or prevent low amounts of potassium in the blood.
Compared with California prescribers
Dr. Mak wrote 21 prescriptions for Potassium Chloride, about half as often as the typical California prescriber of it (48). Medicare paid $21.17 per fill, versus $24.00 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 California prescribers
Dr. Mak wrote 20 prescriptions for Escitalopram Oxalate, about 42% as often as the typical California prescriber of it (48). Medicare paid $6.36 per fill, versus $11.14 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
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 California prescribers
Dr. Mak wrote 19 prescriptions for Furosemide, about 30% as often as the typical California prescriber of it (64). Medicare paid $4.80 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.
What it is used for
This combination of nirmatrelvir and ritonavir is used to treat coronavirus disease (COVID-19) in people who have mild to moderate symptoms and have a high risk for COVID-19 complications.
Compared with California prescribers
Dr. Mak wrote 19 prescriptions for Paxlovid, about 79% as often as the typical California prescriber of it (24). Medicare paid $75.23 per fill, versus $42.82 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
Finasteride is used to shrink an enlarged prostate (benign prostatic hyperplasia or BPH) in adult men.
Compared with California prescribers
Dr. Mak wrote 18 prescriptions for Finasteride, about 32% as often as the typical California prescriber of it (56). Medicare paid $11.49 per fill, versus $13.71 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
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with California prescribers
Dr. Mak wrote 18 prescriptions for Omeprazole, about 23% as often as the typical California prescriber of it (78). Medicare paid $10.80 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
See also Warning section.
Compared with California prescribers
Dr. Mak wrote 18 prescriptions for Tramadol Hcl, about 41% as often as the typical California prescriber of it (44). Medicare paid $3.50 per fill, versus $6.24 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
Carvedilol is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Mak wrote 17 prescriptions for Carvedilol, about 30% as often as the typical California prescriber of it (56). Medicare paid $28.71 per fill, versus $8.98 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
Montelukast is used to control and prevent symptoms caused by asthma (such as wheezing and shortness of breath).
Compared with California prescribers
Dr. Mak wrote 17 prescriptions for Montelukast Sodium, about 35% as often as the typical California prescriber of it (49). Medicare paid $22.48 per fill, versus $10.71 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
Spironolactone is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Mak wrote 17 prescriptions for Spironolactone, about half as often as the typical California prescriber of it (37). Medicare paid $7.88 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 hormone.
Compared with California prescribers
Dr. Mak wrote 16 prescriptions for Estradiol, about half as often as the typical California prescriber of it (38). Medicare paid $40.49 per fill, versus $56.87 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
Pantoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with California prescribers
Dr. Mak wrote 16 prescriptions for Pantoprazole Sodium, about 25% as often as the typical California prescriber of it (65). Medicare paid $12.04 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.
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 California prescribers
Dr. Mak wrote 16 prescriptions for Sertraline Hcl, about 35% as often as the typical California prescriber of it (46). Medicare paid $26.19 per fill, versus $9.59 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 California prescribers
Dr. Mak wrote 15 prescriptions for Duloxetine Hcl, about 37% as often as the typical California prescriber of it (40). Medicare paid $48.78 per fill, versus $24.72 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 California prescribers
Dr. Mak wrote 15 prescriptions for Synthroid, about 39% as often as the typical California prescriber of it (38). Medicare paid $124.90 per fill, versus $74.43 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
Empagliflozin is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Mak wrote 14 prescriptions for Jardiance, about 24% as often as the typical California prescriber of it (58). Medicare paid $1,688.49 per fill, versus $933.82 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
Valsartan is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Mak wrote 14 prescriptions for Valsartan, about 36% as often as the typical California prescriber of it (39). Medicare paid $49.85 per fill, versus $28.57 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
Pravastatin 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 California prescribers
Dr. Mak wrote 13 prescriptions for Pravastatin Sodium, about 34% as often as the typical California prescriber of it (38). Medicare paid $17.61 per fill, versus $13.25 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
Dulaglutide is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Mak wrote 13 prescriptions for Trulicity, about 35% as often as the typical California prescriber of it (37). Medicare paid $1,327.43 per fill, versus $1,230.75 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
Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults.
Compared with California prescribers
Dr. Mak wrote 13 prescriptions for Zolpidem Tartrate, about 29% as often as the typical California prescriber of it (45). Medicare paid $2.83 per fill, versus $6.02 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
Clonazepam is used to prevent and control seizures.
Compared with California prescribers
Dr. Mak wrote 12 prescriptions for Clonazepam, about 30% as often as the typical California prescriber of it (40). Medicare paid $2.11 per fill, versus $7.09 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).
Compared with California prescribers
Dr. Mak wrote 12 prescriptions for Fluoxetine Hcl, about 36% as often as the typical California prescriber of it (33). Medicare paid $3.83 per fill, versus $11.85 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, anxiety disorders, post-traumatic stress disorder).
Compared with California prescribers
Dr. Mak wrote 12 prescriptions for Paroxetine Hcl, about half as often as the typical California prescriber of it (25). Medicare paid $12.35 per fill, versus $12.24 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
This drug is used to treat high blood pressure.
Compared with California prescribers
Dr. Mak wrote 11 prescriptions for Losartan-Hydrochlorothiazide, about 28% as often as the typical California prescriber of it (39). Medicare paid $18.42 per fill, versus $13.09 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. Mak’s prescriptions
What does Dr. Mak prescribe most?
In 2024 Medicare Part D data, Dr. Mak's most prescribed medications were Atorvastatin Calcium (267), Amlodipine Besylate (193) and Levothyroxine Sodium (115).
How does Dr. Mak's prescribing compare with other California prescribers?
Of the 52 medications with a state comparison, Dr. Mak prescribes 2 more often than the typical California prescriber, 13 about as often and 37 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Mak 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.
