Joseph E. Cassara, M.D.
Gastroenterology Physician · Lafayette, CO
Joseph E. Cassara, M.D. is a gastroenterology physician with a practice address in Lafayette, Colorado, and NPI 1275755290, issued on May 2, 2007. Check the license (Colorado 46321, as entered in NPPES) on the Colorado Medical Board; the Medicare figures below come from public CMS files.
- Name
- Joseph E. Cassara
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 46321 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1000 W South Boulder RD, Lafayette, CO 80026
- Phone
- (303) 604-5000
- Enumerated
- May 2, 2007
- Record last updated
- Mar 9, 2026
- Medicaid ID
- 40587843 CO
- Medicare enrollment
- Enrolled (PECOS I20081021000774); accepts Medicare assignment
- Medical or professional school
- University Of Vermont College Of Medicine, 2001
- Entity
- Type 1 · individual
Also registered at 1000 W South Boulder RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Cezary Dobija, M.D.Internal Medicine Physician1639151459
- Susan DuikerFamily Medicine Physician1578545653
- Julia Engle, PTPhysical Therapist1164856738
Verify Joseph E. Cassara in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersColorado Medical Board
Search for license 46321Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
37% fewer Medicare Part D claims than the average gastroenterology physician in 2024
507 Medicare Part D claims for 288 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Gavilyte-C188 claims
- Pantoprazole Sodium166 claims
- Mesalamine25 claims
- Famotidine20 claims
- Omeprazole20 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $1,551.60
77 payments; by number, the most common kind was food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Boulder Valley Gastroenterology Inc.Lafayette, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gastroenterology Physician providers in Colorado
There are 334 gastroenterology physician records in Colorado.
Other gastroenterology physician records in Colorado
- David Adams, MDUsaf Academy, CO1477521011
- Douglas Adler, M.D.Colorado Springs, CO1891748687
- Abdullah Al-ShahraniAurora, CO1033598297
- Bader Alajlan, M.B.B.SAurora, CO1326392291
- Sam Anouna, M.D.Thornton, CO1639119365
- Kevin Ashby, M.D.Durango, CO1245209907
- Augustin Attwell, MDLakewood, CO1275620304
- Gregory Austin, MDAurora, CO1750503876
- Camille Azar, M.D.Pueblo, CO1265477046
- Arash Babaei, M.D.Denver, CO1598716482
Common questions
What is Joseph E. Cassara, M.D.'s NPI number?
Joseph E. Cassara, M.D.'s National Provider Identifier (NPI) is 1275755290, issued on May 2, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Joseph E. Cassara, M.D. located?
The NPPES record lists a practice address at 1000 W South Boulder RD, Lafayette, CO, 80026. Phone: (303) 604-5000. Providers update this record themselves, so call before visiting.
How can I verify Joseph E. Cassara, M.D.'s license?
NPPES lists Colorado license number 46321, as entered by the provider. Search the Colorado Medical Board at https://dpo.colorado.gov/Medical. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joseph E. Cassara, M.D. prescribe under Medicare Part D?
In 2024, Joseph E. Cassara, M.D. had 507 Medicare Part D claims for 288 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.