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Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
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Methodology•Download Data
  1. Home
  2. Providers
  3. Armistead Williams
⚕️
MDIndividual

Armistead Williams, M.D.

NPI: 1073580908
New York, NY
10 years of data
Nephrology
$37.6M
Total Payments
174
Beneficiaries
984.6K
Services
1.37x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$37.6M
Specialty median$185.2K
Rank #2 of 2 in specialty

📋 Key Findings

1Billed $37.6M over 10 years
299th percentile in Nephrology by payments
3394 services/day — physically implausible
4Payments surged 62% in 2019

⚠️ This provider averages 394 services per working day — physically unusual for an individual practitioner

Based on 984.6K total services over 10 years (250 working days/year). Learn about impossible service volumes →

🔎 Data Analysis

This provider's $37.6M in total Medicare payments ranks in the 99th percentile of Nephrology providers nationally.

Averaging 394 services per working day raises questions about billing patterns.

Medicare payments to this provider grew 472% from 2014 to 2023.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

📈

Notable: Payments increased 62% in 2019

Year-over-year payment surges can indicate changes in practice volume, new services, or billing pattern shifts.

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid — the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2014$303.27$216.481.40x$86.79$1.2M5.4K14
2015$54.51$37.681.45x$16.83$1.2M31.3K14
2016$52.13$37.131.40x$15.00$1.9M51.2K16
2017$60.54$40.651.49x$19.89$2.1M50.5K16
2018$55.52$39.691.40x$15.83$2.5M62.5K17
2019$48.61$35.491.37x$13.12$4.0M113.4K18
2020$47.65$36.351.31x$11.30$5.2M141.8K23
2021$47.03$36.141.30x$10.89$6.3M173.6K21
2022$52.01$37.671.38x$14.34$6.6M176.3K16
2023$53.03$37.651.41x$15.38$6.7M178.7K19

Top Procedures (20)

J2350Injection, ocrelizumab, 1 mg
$18.1M
393.9K services$45.99/svc1.32x markup
J2323Injection, natalizumab, 1 mg
$6.5M
401.4K services$16.31/svc1.42x markup
J9310Injection, rituximab, 100 mg
$4.6M
7.6K services$608.78/svc1.40x markup
J9312Injection, rituximab, 10 mg
$3.0M
42.6K services$70.15/svc1.44x markup
J1561Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg
$1.7M
47.4K services$36.36/svc1.27x markup
J1566Injection, immune globulin, intravenous, lyophilized (e.g., powder), not otherwise specified, 500 mg
$875.4K
33.2K services$26.38/svc1.28x markup
J1568Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg
$612.7K
19.9K services$30.80/svc1.27x markup
96413Administration of chemotherapy into vein, 1 hour or less
$362.8K
3.0K services$119.34/svc1.69x markup
J0475Injection, baclofen, 10 mg
$342.1K
2.6K services$133.26/svc1.58x markup
99215Established patient office or other outpatient visit, 40-54 minutes
$340.2K
2.7K services$127.43/svc1.44x markup
62270Removal of cerebrospinal fluid with lower back spinal tap for diagnostic test
$220.6K
1.7K services$128.05/svc1.80x markup
96415Administration of chemotherapy into vein, each additional hour
$191.2K
7.3K services$26.05/svc2.45x markup
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less
$140.3K
2.3K services$61.58/svc1.52x markup
62370Electronic analysis reprogramming and refill of spinal canal drug infusion pump by physician
$136.6K
1.4K services$96.30/svc1.85x markup
96366Infusion into a vein for therapy, prevention, or diagnosis, each additional hour
$89.4K
4.9K services$18.13/svc1.37x markup
P9045Infusion, albumin (human), 5%, 250 ml
$67.5K
1.6K services$42.77/svc1.51x markup
96374Injection of drug or substance into vein
$65.8K
1.8K services$36.67/svc1.43x markup
36514Mechanical separation of plasma from opening blood
$58.1K
125 services$464.99/svc1.53x markup
99211Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional
$46.8K
2.8K services$16.59/svc1.94x markup
62368Electronic analysis and reprogramming of spinal canal drug infusion pump
$26.5K
596 services$44.43/svc1.65x markup
Show detailed table ▾
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
J2350Injection, ocrelizumab, 1 mg393.9K$18.1M$45.991.32x
J2323Injection, natalizumab, 1 mg401.4K$6.5M$16.311.42x
J9310Injection, rituximab, 100 mg7.6K$4.6M$608.781.40x
J9312Injection, rituximab, 10 mg42.6K$3.0M$70.151.44x
J1561Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg47.4K$1.7M$36.361.27x
J1566Injection, immune globulin, intravenous, lyophilized (e.g., powder), not otherwise specified, 500 mg33.2K$875.4K$26.381.28x
J1568Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg19.9K$612.7K$30.801.27x
96413Administration of chemotherapy into vein, 1 hour or less3.0K$362.8K$119.341.69x
J0475Injection, baclofen, 10 mg2.6K$342.1K$133.261.58x
99215Established patient office or other outpatient visit, 40-54 minutes2.7K$340.2K$127.431.44x
62270Removal of cerebrospinal fluid with lower back spinal tap for diagnostic test1.7K$220.6K$128.051.80x
96415Administration of chemotherapy into vein, each additional hour7.3K$191.2K$26.052.45x
96365Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less2.3K$140.3K$61.581.52x
62370Electronic analysis reprogramming and refill of spinal canal drug infusion pump by physician1.4K$136.6K$96.301.85x
96366Infusion into a vein for therapy, prevention, or diagnosis, each additional hour4.9K$89.4K$18.131.37x
P9045Infusion, albumin (human), 5%, 250 ml1.6K$67.5K$42.771.51x
96374Injection of drug or substance into vein1.8K$65.8K$36.671.43x
36514Mechanical separation of plasma from opening blood125$58.1K$464.991.53x
99211Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional2.8K$46.8K$16.591.94x
62368Electronic analysis and reprogramming of spinal canal drug infusion pump596$26.5K$44.431.65x

Markup Analysis

Charge-to-Payment Ratio

1.37x

This provider submits charges 1.37 times higher than what Medicare actually pays.

What This Means

A markup ratio of 1.37x means for every $100 Medicare pays, this provider initially charges $137. This is lower than the national average.

Location

New York, NY

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

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Data Sources

  • • Centers for Medicare & Medicaid Services (CMS)
  • • Medicare Provider Utilization and Payment Data (2014-2023)
  • • National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

Believe this data is inaccurate? Dispute this data