Doctor profile · Federal record
Dr. Cassandra Williams, MD
Internal Medicine Physician (CMS: Internal Medicine) · Internal Medicine Physician · Amherst, NY
- NPI 1558546820
- Accepts Medicare
- 21 yrs in practice
- Licensed in 2 states
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
3980A Sheridan Dr Ste 200
Amherst, NY 142261741
(716) 309-4772 - Mailing address
-
Po Box 488
Buffalo, NY 142400488
Credentials & registration
- NPI registered
- January 2008 — 18 yrs on file
- Profile last updated
- October 30, 2020
- Year of graduation
- 2005 — 21 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State licenses (2)
- New York #302772 · North Carolina #200800022
- Medicaid (3)
- NY #06012940 · SC #N0002C · NC #5909659
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1558546820. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
811
Distinct HCPCS
5
Medicare allowed
$90,788
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99309 |
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | 625 | 180 | $102 | |
99306 |
Initial nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | 129 | 106 | $172 | |
99308 |
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes | 24 | 22 | $71 | |
99316 |
Nursing facility discharge management, more than 30 minutes | 18 | 18 | $123 | |
99497 |
Advance care planning, first 30 minutes | 15 | 15 | $73 |
In context: peer comparison
Among 9 peers in this city , average services per provider: 89. This provider delivers 9.1× the peer median.Open Payments
Industry payments received
All-time total
$232
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| AstraZeneca Pharmaceuticals LP | 1 | $116.50 | |
| ACADIA Pharmaceuticals Inc | 1 | $115.38 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
8,537
Patients
938
Total drug cost
$431,405
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Levothyroxine Sodium | Generic | 1,156 | 70 | $11,096 |
| Atorvastatin Calcium | Generic | 752 | 96 | $19,964 |
| Furosemide | Generic | 725 | 69 | $4,959 |
| Eliquis (Apixaban) | Brand | 714 | 58 | $203,878 |
| Amlodipine Besylate | Generic | 615 | 82 | $7,481 |
| Sertraline Hcl | Generic | 565 | 57 | $11,741 |
| Levetiracetam | Generic | 532 | 56 | $33,750 |
| Metoprolol Succinate | Generic | 473 | 55 | $11,914 |
| Duloxetine Hcl | Generic | 466 | 54 | $40,303 |
| Divalproex Sodium | Generic | 457 | 57 | $35,902 |
Frequently asked questions
What is Dr. Cassandra Williams's medical specialty?
Dr. Cassandra Williams practices Internal Medicine Physician in Amherst, NY.
Where does Dr. Cassandra Williams practice?
Dr. Cassandra Williams practices at 3980A Sheridan Dr Ste 200, Amherst, NY 142261741. Office phone: 7163094772.
What is Dr. Cassandra Williams's NPI?
Dr. Cassandra Williams's National Provider Identifier (NPI) is 1558546820, issued by NPPES.
Does Dr. Cassandra Williams accept Medicare assignment?
Yes. Dr. Cassandra Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Cassandra Williams commonly perform?
Top Medicare-reported procedures in 2023: Subsequent nursing facility care with moderate level of medical decision making (HCPCS 99309); Initial nursing facility care with high level of medical decision making (HCPCS 99306); Subsequent nursing facility care with straightforward level of medical decision making (HCPCS 99308). Source: CMS Medicare Physician & Other Practitioners file.