Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

SEREN MICHELLE GEDALLOVICH MD
Prescription History 1548764939
Internal Medicine - Gastroenterology in Stanford, CA

Active since March 20, 2018PECOS Enrolled
300 PASTEUR DR, STANFORD, CA 94305(650) 723-4000 Get Directions

NPPES record last updated: October 7, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Oct 7, 2026, Dec 13, 2018, Mar 20, 2018 (3 updates tracked since 2018).

Medicare Part D Prescription History

Explore the verified Medicare Part D prescription history, volume metrics, and calculated drug costs for SEREN MICHELLE GEDALLOVICH MD, an active Gastroenterology specialist practicing in Stanford, CA. Our medical registry currently tracks 2 unique pharmaceutical formulations prescribed by this provider, representing an estimated volume of 25 documented patient claims. Among these therapy options, the most frequently utilized medication is Omeprazole, which accounts for 14 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
25
Total Claims
39
30-Day Fills
Omeprazole
Most Prescribed · 14 claims
View details
2 medications · 2024 Medicare Part D
Medicare Part D medications prescribed by SEREN MICHELLE GEDALLOVICH MD in 2024, with prescription volumes, average cost per fill, and CA state comparisons
Medication Prescriptions (2024)Rx (2024) Avg Cost per FillCost / Fill Vs. Other CA PrescribersVs. CA Avg
Omeprazole14$14.01▼ Less than typical

About Omeprazole: Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers). Show more ▾

It works by decreasing the amount of acid your stomach makes. It relieves symptoms such as heartburn, difficulty swallowing, and cough. This medication helps heal acid damage to the stomach and esophagus, helps prevent ulcers, and may help prevent cancer of the esophagus. Omeprazole belongs to a class of drugs known as proton pump inhibitors (PPIs). If you are self-treating with this medication, over-the-counter omeprazole products are used to treat frequent heartburn (occurring 2 or more days a week). Since it may take 1 to 4 days to have full effect, these products do not relieve heartburn right away. For over-the-counter products, carefully read the package instructions to make sure the product is right for you. Check the ingredients on the label even if you have used the product before. The manufacturer may have changed the ingredients. Also, products with similar brand names may contain different ingredients meant for different purposes. Taking the wrong product could harm you. A 4-methoxy-3,5-dimethylpyridyl, 5-methoxybenzimidazole derivative of timoprazole that is used in the therapy of STOMACH ULCERS and ZOLLINGER-ELLISON SYNDROME. The drug inhibits an H(+)-K(+)-EXCHANGING ATPASE which is found in GASTRIC PARIETAL CELLS.

In 2024, this provider wrote 14 Medicare prescriptions for Omeprazole, about 18% of the volume of the typical California prescriber of this medication (78.1). Medicare paid an average of $14.01 per fill, versus $11.26 statewide.

How often this provider prescribes it

This provider
14
CA average
78.1

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
$14.01
CA average
$11.26

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

28
30-Day Fills
standardized to 30-day supplies
840
Days of Medication
total across all patients in 2024
Esomeprazole Magnesium11$115.95▼ Less than typical

About Esomeprazole Magnesium: Esomeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers). Show more ▾

It works by decreasing the amount of acid your stomach makes. It relieves symptoms such as heartburn, difficulty swallowing, and cough. This medication helps heal acid damage to the stomach and esophagus, helps prevent ulcers, and may help prevent cancer of the esophagus. Esomeprazole belongs to a class of drugs known as proton pump inhibitors (PPIs). If you are self-treating with this medication, over-the-counter esomeprazole products are used to treat frequent heartburn (occurring 2 or more days a week). Since it may take 1 to 4 days to have full effect, these products do not relieve heartburn right away. For over-the-counter products, carefully read the package instructions to make sure the product is right for you. Check the ingredients on the label even if you have used the product before. The manufacturer may have changed the ingredients. Also, products with similar brand names may contain different ingredients meant for different purposes. Taking the wrong product could harm you. The S-isomer of omeprazole.

In 2024, this provider wrote 11 Medicare prescriptions for Esomeprazole Magnesium, about a third of the volume of the typical California prescriber of this medication (28.2). Medicare paid an average of $115.95 per fill, versus $43.47 statewide.

How often this provider prescribes it

This provider
11
CA average
28.2

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
$115.95
CA average
$43.47

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

11
30-Day Fills
standardized to 30-day supplies
330
Days of Medication
total across all patients in 2024
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 SEREN MICHELLE GEDALLOVICH MD is compiled from the Centers for Medicare & Medicaid Services (CMS) Medicare Part D Prescriber Public Use File for calendar year 2024, 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 Gastroenterology prescribing approach at this Stanford, 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 among CA prescribers of the same medication and form, shown only when at least five prescribers contribute. Always confirm current medications and costs directly with the provider and your plan.

About the medication summaries. Drug use descriptions come from the CMS Medicare Part D Drug Spending Dashboard (2024), and substance definitions from Medical Subject Headings (MeSH) 2026, U.S. National Library of Medicine. They are summaries that do not contain all possible information about a medication and are not individual medical advice. Ask a health care professional about any medication and your specific health needs.