Dr. Armistead Williams, M.D.
What this data tells you about Dr. Williams
Dr. Armistead Williams is a neurology specialist in New York, NY, with 20 years of NPI registration. Based on federal Medicare data, Dr. Williams performed 178,672 Medicare services across 1,273 unique beneficiaries.
Between the years covered by Open Payments, Dr. Williams received a total of $48 from 1 pharmaceutical and/or device company across 1 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in neurology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Williams is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Ocrelizumab infusion (Ocrevus) for MS | 100,800 | $46 | $63 |
| Injection, natalizumab, 1 mg | 52,200 | $18 | $28 |
| Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg | 15,040 | $38 | $49 |
| Rituximab injection, 10 mg Administration of a 10 mg dose of rituximab medication via injection. |
6,800 | $63 | $89 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
732 | $25 | $61 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
634 | $18 | $23 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
321 | $57 | $94 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
319 | $116 | $189 |
| Methylprednisolone injection, up to 125 mg An injection of methylprednisolone sodium succinate, a corticosteroid medication, with a dosage of up to 125 mg. |
312 | $4 | $6 |
| Baclofen injection, 10 mg A 10 mg dose of the muscle relaxant baclofen is injected into the body. |
263 | $136 | $206 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
255 | $145 | $207 |
| Normal saline infusion, 500 ml Administration of sterile normal saline solution through an intravenous line. This procedure involves the infusion of a 500 ml unit of the solution. |
245 | $1 | $2 |
| Intravenous drug injection A procedure involving the administration of a medication or substance directly into a vein. |
205 | $33 | $49 |
| Injection, hydrocortisone sodium succinate, up to 100 mg | 153 | $13 | $18 |
| Spinal drug pump reprogramming and refill A physician electronically adjusts the settings of a spinal drug infusion pump and refills its medication reservoir. |
115 | $74 | $168 |
| Lumbar puncture for diagnostic test A procedure to remove cerebrospinal fluid from the lower back for diagnostic testing. |
72 | $113 | $211 |
| Normal saline infusion, 1000 cc Administration of 1000 cc of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater solution. |
67 | $2 | $3 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
65 | $4 | $6 |
| Normal saline infusion, 250 cc Administration of 250 cubic centimeters of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater fluid. |
35 | $1 | $1 |
| Electronic analysis and reprogramming of spinal drug pump This procedure involves electronically analyzing and reprogramming a spinal canal drug infusion pump. It does not include the surgical insertion or removal of the device. |
20 | $32 | $95 |
| New patient office visit, complex (60-74 min) | 19 | $198 | $282 |
Industry Payment Transparency
Open Payments through 2020 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2020)
Associated products mentioned in payments ›
The majority of payments (100%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in neurology and does not inherently indicate bias, but patients may wish to be aware.
Geographic Context
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2020 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Williams is a mixed practice specialist, with above-average Medicare volume (top 0% in NY), with speaking/promotional industry engagement, with 20 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Williams experienced with ocrelizumab infusion (ocrevus) for ms?
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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