Cassandra Williams, MD
Internal Medicine Physician · Amherst, NY
Cassandra Williams, MD is an internal medicine physician with a practice address in Amherst, New York, and NPI 1558546820, issued on Jan 7, 2008. Check the license (New York 302772, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Cassandra Williams
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 302772 NY
200800022 NC
Self-reported in NPPES; status is on the state search - Practice location
- 3980A Sheridan Dr Ste 200, Amherst, NY 14226
- Phone
- (716) 309-4772
- Enumerated
- Jan 7, 2008
- Record last updated
- Oct 30, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid IDs
- 06012940 NY
N0002C SC
5909659 NC - Medicare enrollment
- Enrolled (PECOS I20200708001875); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 3980A Sheridan Dr Ste 200
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Nicole Boyd, ANPAdult Health Nurse Practitioner1225713993
- Bridget Golinski, FNPFamily Nurse Practitioner1912420563
- Azadeh Hassan-Tehrani, FNPFamily Nurse Practitioner1598371130
- Megan James, FNP-BCFamily Nurse Practitioner1902688443
Verify Cassandra Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 302772Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7.3 times the Medicare Part D claims of the average internal medicine physician in 2024
23,198 Medicare Part D claims for 441 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims. 68 claims were for opioids.
Most prescribed
- Levothyroxine Sodium1,190 claims
- Eliquis755 claims
- Amlodipine Besylate753 claims
- Atorvastatin Calcium743 claims
- Furosemide697 claims
- Sertraline Hcl521 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: $231.88
2 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 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 2 group practices
- Cogent Medical Care PCBuffalo, NY
- Maine Medical Consultants PCBuffalo, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cassandra Williams among 12,067 internal medicine physician records in New York
Cassandra Williams, MD is one of 12,067 internal medicine physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 56% of them.
- NPI issued2008 · 56% of these records are older, 40% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2005 · median 2002 among the 7,221 with a school on file
- Record last updated2020 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
36 internal medicine physician records list a practice address in Amherst
They are 36 of the 1,741 NPPES records with a practice address in Amherst, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in Amherst → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Bauers, M.D.Amherst, NY 142261942297122
- Gabriel Cortes, D.O.Amherst, NY 142261073573101
- Joseph Gentile, MDAmherst, NY 142261487604955
- David Hartman, M.D.Amherst, NY 142261790775575
- Paul Kuritzky, M.D.Amherst, NY 142261336104694
- Shahera Noukla, MDAmherst, NY 142261659329803
- Elizabeth O Neill, M.D.Amherst, NY 142261346204377
- Irene Paulus, MBBSAmherst, NY 142261619933710
Common questions
What is Cassandra Williams, MD's NPI number?
Cassandra Williams, MD's National Provider Identifier (NPI) is 1558546820, issued on Jan 7, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Cassandra Williams, MD located?
The NPPES record lists a practice address at 3980A Sheridan Dr Ste 200, Amherst, NY, 14226. Phone: (716) 309-4772. Providers update this record themselves, so call before visiting.
How can I verify Cassandra Williams, MD's license?
NPPES lists New York license number 302772, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Cassandra Williams, MD prescribe under Medicare Part D?
In 2024, Cassandra Williams, MD had 23,198 Medicare Part D claims for 441 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.