SHIRLEY CHIO O.D.
Prescription History 1871960021
Optometrist in Ventura, CA
What does Dr. Chio prescribe?
In 2024, Dr. Chio wrote 1,406 Medicare prescriptions for 16 medications. The most prescribed was Latanoprost, with 573 prescriptions for 236 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. Chio 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 California prescribers.
What it is used for
Latanoprost is used to treat high pressure inside the eye due to glaucoma (open angle type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 573 prescriptions for Latanoprost, about 3.6 times as often as the typical California prescriber of it (159). Medicare paid $13.03 per fill, versus $12.02 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 product contains two drugs used to treat high pressure inside the eye due to glaucoma (open angle-type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 208 prescriptions for Dorzolamide-Timolol, about 1.7 times as often as the typical California prescriber of it (122). Medicare paid $24.85 per fill, versus $20.06 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 to treat high pressure inside the eye due to glaucoma (open angle-type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 163 prescriptions for Timolol Maleate, about 1.7 times as often as the typical California prescriber of it (93). Medicare paid $12.97 per fill, versus $16.60 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 open-angle glaucoma or high fluid pressure in the eye.
Compared with California prescribers
Dr. Chio wrote 106 prescriptions for Brimonidine Tartrate, about 1.2 times as often as the typical California prescriber of it (89). Medicare paid $40.28 per fill, versus $42.08 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
This medication is used to treat certain eye infections (such as conjunctivitis).
Compared with California prescribers
Dr. Chio wrote 65 prescriptions for Erythromycin, about 1.3 times as often as the typical California prescriber of it (49). Medicare paid $11.43 per fill, versus $13.38 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 to treat certain eye conditions due to inflammation or injury.
Compared with California prescribers
Dr. Chio wrote 61 prescriptions for Prednisolone Acetate, about 39% as often as the typical California prescriber of it (155). Medicare paid $29.49 per fill, versus $42.12 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 conditions involving swelling (inflammation) of the eyes and to treat or prevent bacterial eye infections.
Compared with California prescribers
Dr. Chio wrote 34 prescriptions for Neomycin-Polymyxin-Dexameth, about 82% as often as the typical California prescriber of it (41). Medicare paid $9.16 per fill, versus $11.42 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
Cyclosporine eye drops are used to treat a certain type of dry eyes.
Compared with California prescribers
Dr. Chio wrote 29 prescriptions for Restasis, about 41% as often as the typical California prescriber of it (71). Medicare paid $1,168.47 per fill, versus $850.34 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
Netarsudil is used to treat high pressure inside the eye due to certain eye conditions (such as open-angle glaucoma, ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 27 prescriptions for Rhopressa, about half as often as the typical California prescriber of it (52). Medicare paid $406.02 per fill, versus $494.93 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
Cyclosporine eye drops are used to treat a certain type of dry eyes.
Compared with California prescribers
Dr. Chio wrote 26 prescriptions for Cyclosporine, about 40% as often as the typical California prescriber of it (64). Medicare paid $711.18 per fill, versus $344.54 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
Bimatoprost is used to treat high pressure inside the eye due to glaucoma (open-angle type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 25 prescriptions for Lumigan, about 32% as often as the typical California prescriber of it (77). Medicare paid $717.05 per fill, versus $448.13 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 a quinolone antibiotic used for eye infections.
Compared with California prescribers
Dr. Chio wrote 24 prescriptions for Moxifloxacin, about 24% as often as the typical California prescriber of it (101). Medicare paid $22.02 per fill, versus $20.90 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
Dorzolamide is used to treat high pressure inside the eye due to glaucoma (open angle-type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 21 prescriptions for Dorzolamide Hcl, about 42% as often as the typical California prescriber of it (51). Medicare paid $36.64 per fill, versus $20.46 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 dry eye disease.
Compared with California prescribers
Dr. Chio wrote 17 prescriptions for Xiidra, about 32% as often as the typical California prescriber of it (53). Medicare paid $1,153.46 per fill, versus $941.89 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 open-angle glaucoma or high fluid pressure in the eye.
Compared with California prescribers
Dr. Chio wrote 14 prescriptions for Alphagan P, about 32% as often as the typical California prescriber of it (44). Medicare paid $309.23 per fill, versus $361.63 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
Travoprost is used to treat high pressure inside the eye due to glaucoma (open-angle type) or other eye diseases (such as ocular hypertension).
Compared with California prescribers
Dr. Chio wrote 13 prescriptions for Travoprost, about 41% as often as the typical California prescriber of it (32). Medicare paid $96.01 per fill, versus $149.93 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. Chio’s prescriptions
What does Dr. Chio prescribe most?
In 2024 Medicare Part D data, Dr. Chio's most prescribed medications were Latanoprost (573), Dorzolamide-Timolol (208) and Timolol Maleate (163).
How does Dr. Chio's prescribing compare with other California prescribers?
Of the 16 medications with a state comparison, Dr. Chio prescribes 4 more often than the typical California prescriber, 2 about as often and 10 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Chio 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.
