DONALD WHANG M.D.
Prescription History 1922325521
Internal Medicine - Infectious Disease in Torrance, CA
What does Dr. Whang prescribe?
In 2024, Dr. Whang wrote 397 Medicare prescriptions for 19 medications. The most prescribed was Biktarvy (bictegrav/emtricit/tenofov ala), with 59 prescriptions for 19 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. Whang prescribes.
Medications 19 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
This combination product is used by itself to help control HIV infection.
Compared with California prescribers
Dr. Whang wrote 59 prescriptions for Biktarvy, about 77% as often as the typical California prescriber of it (77). Medicare paid $10,822.86 per fill, versus $4,498.22 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
Terazosin is used alone or with other drugs to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Whang wrote 36 prescriptions for Terazosin Hcl, about as often as the typical California prescriber of it (36). Medicare paid $38.52 per fill, versus $37.76 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 wide variety of bacterial infections, including those that cause acne.
Compared with California prescribers
Dr. Whang wrote 28 prescriptions for Doxycycline Monohydrate, about as often as the typical California prescriber of it (27). Medicare paid $118.67 per fill, versus $15.48 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
Amoxicillin is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Whang wrote 26 prescriptions for Amoxicillin, about 68% as often as the typical California prescriber of it (38). Medicare paid $36.54 per fill, versus $4.15 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
This product contains 2 drugs: dolutegravir and lamivudine.
Compared with California prescribers
Dr. Whang wrote 26 prescriptions for Dovato, about 63% as often as the typical California prescriber of it (41). Medicare paid $9,388.17 per fill, versus $3,208.63 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
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. Whang wrote 23 prescriptions for Atorvastatin Calcium, about 11% as often as the typical California prescriber of it (202). Medicare paid $11.67 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
Fluconazole is used to treat vaginal yeast infections.
Compared with California prescribers
Dr. Whang wrote 20 prescriptions for Fluconazole, about as often as the typical California prescriber of it (21). Medicare paid $164.82 per fill, versus $17.16 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
Dolutegravir/rilpivirine is used to help control HIV infection.
Compared with California prescribers
Dr. Whang wrote 19 prescriptions for Juluca, about half as often as the typical California prescriber of it (34). Medicare paid $10,195.88 per fill, versus $4,066.60 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 product is used to help control HIV infection.
Compared with California prescribers
Dr. Whang wrote 18 prescriptions for Genvoya, about 66% as often as the typical California prescriber of it (27). Medicare paid $8,636.88 per fill, versus $4,792.44 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
Azithromycin is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Whang wrote 15 prescriptions for Azithromycin, about 39% as often as the typical California prescriber of it (38). Medicare paid $23.56 per fill, versus $4.49 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
Ethambutol is used with other medications to treat tuberculosis (TB).
Compared with California prescribers
Dr. Whang wrote 15 prescriptions for Ethambutol Hcl, about 65% as often as the typical California prescriber of it (23). Medicare paid $68.49 per fill, versus $45.81 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 another medication to help prevent a certain serious infection (Mycobacterium avium complex-MAC).
Compared with California prescribers
Dr. Whang wrote 15 prescriptions for Rifabutin, about 84% as often as the typical California prescriber of it (18). Medicare paid $520.34 per fill, versus $392.20 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
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with California prescribers
Dr. Whang wrote 14 prescriptions for Tamsulosin Hcl, about 17% as often as the typical California prescriber of it (84). Medicare paid $17.32 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 a wide variety of bacterial infections.
Compared with California prescribers
Dr. Whang wrote 13 prescriptions for Cefadroxil, about half as often as the typical California prescriber of it (26). Medicare paid $81.42 per fill, versus $12.03 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
Cefdinir is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Whang wrote 12 prescriptions for Cefdinir, about half as often as the typical California prescriber of it (26). Medicare paid $74.78 per fill, versus $14.00 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
Minocycline is used to treat a wide variety of infections.
Compared with California prescribers
Dr. Whang wrote 12 prescriptions for Minocycline Hcl, about half as often as the typical California prescriber of it (27). Medicare paid $34.06 per fill, versus $22.38 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
This medication is used along with other medications to treat a certain lung infection (Mycobacterium avium complex-MAC) after other treatments have not worked.
Compared with California prescribers
Dr. Whang wrote 11 prescriptions for Arikayce, about half as often as the typical California prescriber of it (18). Medicare paid $15,148.24 per fill, versus $14,900.93 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. Whang’s prescriptions
What does Dr. Whang prescribe most?
In 2024 Medicare Part D data, Dr. Whang's most prescribed medications were Biktarvy (59), Terazosin Hcl (36) and Doxycycline Monohydrate (28).
How does Dr. Whang's prescribing compare with other California prescribers?
Of the 19 medications with a state comparison, Dr. Whang prescribes 6 about as often than the typical California prescriber and 13 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Whang 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.
