BONNI S. MASSA M.D.
Prescription History 1508933607
Obstetrics & Gynecology in Petaluma, CA

Active since November 30, 2006PECOS Enrolled
1496 PROFESSIONAL DR STE 603, PETALUMA, CA 94954(628) 336-5260 Get Directions

NPPES record last updated: October 22, 2024. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Medicare Part D Prescription History

Explore the verified Medicare Part D prescription history, volume metrics, and calculated drug costs for BONNI S. MASSA M.D., an active Obstetrics & Gynecology specialist practicing in Petaluma, CA. Our medical registry currently tracks 2 unique pharmaceutical formulations prescribed by this provider, representing an estimated volume of 34 documented patient claims. Among these therapy options, the most frequently utilized medication is Estradiol, which accounts for 17 claims alone. Use the table below to sort by claims, cost, or utilization compared with the state average; select any medication for its full profile.

2
Medications
34
Total Claims
90
30-Day Fills
Estradiol
Most Prescribed · 17 claims
View details
2 medications · 2023 Medicare Part D
Medicare Part D medications prescribed by BONNI S. MASSA M.D. in 2023, with prescription volumes, average cost per fill, and CA state comparisons
Medication Prescriptions (2023)Rx (2023) Avg Cost per FillCost / Fill Vs. Other CA PrescribersVs. CA Avg
Estradiol17$88.43 Less than typical

About Estradiol: This medication is a female hormone (estrogen). Show more ▾

It is used by women to help reduce symptoms of menopause (such as hot flashes, vaginal dryness). These symptoms are caused by the body making less estrogen. If you are using this medication to treat symptoms only in and around the vagina, products applied directly inside the vagina should be considered before medications that are taken by mouth, absorbed through the skin, or injected. This medication may also be used by women who are not able to produce enough estrogen (for example, due to hypogonadism, primary ovarian failure). Certain estrogen products may also be used by women after menopause to prevent bone loss (osteoporosis). However, there are other medications (such as raloxifene, bisphosphonates including alendronate) that are also effective in preventing bone loss and may be safer. These medications should be considered for use before estrogen treatment. The 17-beta-isomer of estradiol, an aromatized C18 steroid with hydroxyl group at 3-beta- and 17-beta-position. Estradiol-17-beta is the most potent form of mammalian estrogenic steroids.

In 2023, this provider wrote 17 Medicare prescriptions for Estradiol, about half the volume of the typical California prescriber of this medication (33). Medicare paid an average of $88.43 per fill, versus $74.73 statewide.

How often this provider prescribes it

This provider
17
CA average
33.0

This provider prescribes this medication less often than the average CA prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$88.43
CA average
$74.73

Gross Part D cost per fill; not the patient's out-of-pocket price.

39
30-Day Fills
standardized to 30-day supplies
1,171
Days of Medication
total across all patients in 2023
ProgesteroneProgesterone, Micronized17$80.37 Less than typical

About Progesterone: This medication is used to treat infertility in women who do not make enough of a certain natural hormone called progesterone. Show more ▾

This hormone is needed to maintain pregnancy. This medication is also used to restore menstrual cycles in women whose cycles have stopped. Progesterone is needed to keep menstrual periods regular.

In 2023, this provider wrote 17 Medicare prescriptions for Progesterone, about half the volume of the typical California prescriber of this medication (29). Medicare paid an average of $80.37 per fill, versus $54.36 statewide.

How often this provider prescribes it

This provider
17
CA average
29.0

This provider prescribes this medication less often than the average CA prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$80.37
CA average
$54.36

Gross Part D cost per fill; not the patient's out-of-pocket price.

51
30-Day Fills
standardized to 30-day supplies
1,530
Days of Medication
total across all patients in 2023
No medications match the current filters.
More than typical Typical Less than typical= prescription volume vs the average CA prescriber of the same medication; volume reflects practice size as well as clinical preference.Green cost= below the CA average cost per fill.

About this data. The prescription history for BONNI S. MASSA M.D. is compiled from the Centers for Medicare & Medicaid Services (CMS) Medicare Part D Prescriber Public Use File for calendar year 2023, the most recent federal release. Figures cover prescriptions filled for Medicare Part D beneficiaries only; prescriptions under private insurance, Medicaid, or self-pay plans are not included. Because prescribing decisions are generally consistent across coverage types, this record offers a useful view of the overall Obstetrics & Gynecology prescribing approach at this Petaluma, CA practice.

Reading the costs. Drug costs are gross amounts paid to pharmacies under Part D, including both plan and beneficiary payments. They are not the price a patient pays at the pharmacy counter. Medications with fewer than 11 claims are excluded from the federal source data, and state comparisons use the average volume among CA prescribers of the same medication. Always confirm current medications and costs directly with the provider and your plan.