Dr. Michael Cassidy , MD
Specialist β’ Berkeley, CA
2001 Dwight Way
Berkeley, CA 947042608
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on October 17, 2005; this date does not establish years in practice.
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Published CMS data list 42 Medicare Part D prescriptions, including refills, in 2016.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2016. Published rows only; this is not a quality measure.
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Published Part D records, 2016:
- Lansoprazole β 15 prescription fills, including refills.
- Pantoprazole Sodium β 15 prescription fills, including refills.
- Omeprazole β 12 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2016. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table Β· Guide: How to read Medicare Part D prescriber data
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Medicare Part D prescriptions went from 26 in 2013 to 42 in 2016.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2013β2016.
Practice Location & Contact Primary Location
2001 Dwight Way
Berkeley, CA 947042608
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
Specialist: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
52 standardized 30-day fills in 2016
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$1,925 in 2016
The total cost of these prescriptions in 2016, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2016.
NPI first issued
2005
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Berkeley and California
Billing and prescribing volume is not a quality rating.
Medicare Part D
Comparisons use 2024 data. The latest CMS data for Dr. Cassidy are from 2016.
42 active clinicians are listed under Specialist with a practice address in Berkeley, CA (5,756 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Berkeley
0% of these 42 clinicians have the CMS telehealth indicator.
7.1% of these 42 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 62% from 26 in 2013 to 42 in 2016.
- 2013: 26
- 2016: 42
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30-day fills
30-day fills increased 100% from 26 in 2013 to 52 in 2016.
- 2013: 26
- 2016: 52
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Part D drug cost
Part D drug cost went from $199 in 2013 to $1,925 in 2016.
- 2013: $199
- 2016: $1,925
Sources: CMS Medicare Part D Prescribers (2016), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2016.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Lansoprazole | Lansoprazole | 15 | 690 | $1,799.71 | β |
| Pantoprazole Sodium | Pantoprazole Sodium | 15 | 450 | $45.48 | β |
| Omeprazole | Omeprazole | 12 | 420 | $79.38 | β |
Source: CMS Part D by Provider and Drug, 2016; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 174400000X
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.
Additional State Medicaid & Healthcare Payer Identifiers
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.), Doctor of Philosophy (Ph.D.)
Internal Medicine - Medical Oncology
Doctor of Medicine (M.D.)
Internal Medicine - Hematology & Oncology
Doctor of Medicine (M.D.)
Career & Practice History
NPI enumerated October 17, 2005.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from January 2017 to August 2026.
NPI Administrative Meta
Other Specialists in Berkeley
- Dr. Jerold Kaplan, MD
- Dr. Brad Zwahlen, MD
- Dr. Michael Silpa, MD
- Dr. Terri Dunn, MD
- Dr. Cornelia Pessoa, MD
- Dr. Faraz Berjis, MD
Mailing Address
2001 Dwight Way
Berkeley, CA 947042608
Phone: 5102041591