NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1326018581 M.D.
Verify on CMS → Alonzo Williams, M.D.
Gastroenterology Physician in Little Rock, Arkansas.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,567 in Gastroenterology Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
6K
Medicare Part D claims · 970 beneficiaries · Gastroenterology Physician avg: 833
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
Industry payments
$295.55
13 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Alonzo Williams, M.D. reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 5,669 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 6K
- Part D claims, 2023
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Alonzo Williams, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Alonzo Williams, M.D. sits
This provider among gastroenterology physician peers
Across the 5,957 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Alonzo Williams, M.D. writes more Part D claims than 99% of them and scores higher on MIPS quality than 91% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one gastroenterology physician peer from a representative sample of 60; the gold marker is Alonzo Williams, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Alonzo Williams, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Alonzo Williams, M.D.?
High performer (top quartile)Primary specialty
Gastroenterology Physician
Medicare Part D claims
5,669 7× vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in Arkansas
How Gastroenterology Physician compares to other specialties among Arkansas providers
Medicare quality performance, MIPS
Alonzo Williams, M.D.'s 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Gastroenterology Physician) - 100/100 vs national avg 83.1
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Alonzo Williams, M.D. appears in the CMS NPPES registry as a Gastroenterology Physician provider holding M.D. credentials at 8908 KANIS RD, Little Rock, AR, 72205, with a listed phone of (501) 227-7688. NPI 1326018581 was issued on 01/23/2006.
Medicare Part D records for calendar year 2023 show 5,669 prescription claims written by this provider, covering 970 Medicare beneficiaries and totaling roughly $505K in drug spend, with an opioid prescribing rate of 3.2%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year (Quality 94.8), compared with the national average of 83.1.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,567 enrolled providers across 54 states and an average of 833 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1326018581 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 01/23/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
94.8232
Quality
100
Promoting Interoperability
Reporting: Group practice
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Alonzo Williams, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$296
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
5,669
Total Claims
$505K
Total Drug Cost
970
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 7,376
- Total Day Supply
- 209,023
- Generic Drug Cost
- $155K
- Opioid Claims
- 184 (3.2% rate)
- Antibiotic Claims
- 54
Patient Demographics
- Average Patient Age
- 67.1 years
- Avg HCC Risk Score
- 1.77
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 305, 65-74: 436, 75-84: 188, 85+: 41
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alonzo Williams, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
2,652 claims
- Famotidine 703
Famotidine
703 claims
- Pantoprazole Sodium 420
Pantoprazole Sodium
420 claims
- Dicyclomine Hcl 342
Dicyclomine Hcl
342 claims
- Promethazine Hcl 305
Promethazine Hcl
305 claims
- Hydrocodone-Acetam… 181
Hydrocodone-Acetaminophen
181 claims
- Alprazolam 121
Alprazolam
121 claims
- Linzess 109
Linzess
109 claims
| Drug | Claims |
|---|---|
| Omeprazole | 2,652 |
| Famotidine | 703 |
| Pantoprazole Sodium | 420 |
| Dicyclomine Hcl | 342 |
| Promethazine Hcl | 305 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 181 |
| Alprazolam | 121 |
| Linzess Linaclotide | 109 |
| Metoclopramide Hcl | 89 |
| Hydrocortisone | 72 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Alonzo Williams, M.D. fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Alonzo Williams, M.D.'s 5,669 claims are above the specialty average of 833.
Nearby Gastroenterology Physician Providers in Arkansas
Other clinicians with the same primary specialty enrolled in Arkansas, drawn from the same CMS NPPES roster as Williams.
Dr. Meer Ali
M.D.
Little Rock, AR
Ioannis Anastasiou
Little Rock, AR
Dr. Terence Angtuaco
M.D.
Little Rock, AR
Dr. John Baber
MD
Little Rock, AR
Dr. David Backstedt
MD
Little Rock, AR
Compare Gastroenterology Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Arkansas medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Gastroenterology Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Alonzo Williams, M.D.'s specialty? ▼
Alonzo Williams, M.D. specializes in Gastroenterology Physician and practices in Little Rock, Arkansas. Credentials: M.D..
How much does Alonzo Williams, M.D. prescribe under Medicare Part D? ▼
In 2023, Alonzo Williams, M.D. wrote 5,669 Medicare Part D claims totaling $505K in drug costs for 970 beneficiaries.
What is Alonzo Williams, M.D.'s Medicare quality score? ▼
Alonzo Williams, M.D. has a CMS MIPS Final Score of 100/100 (Quality: 94.8). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Alonzo Williams, M.D. located? ▼
Alonzo Williams, M.D. is located at 8908 KANIS RD, Little Rock, AR, 72205. Phone: (501) 227-7688.
What is Alonzo Williams, M.D.'s NPI number? ▼
Alonzo Williams, M.D.'s National Provider Identifier (NPI) is 1326018581, issued on 01/23/2006.
Does Alonzo Williams, M.D. prescribe opioids? ▼
Yes, Alonzo Williams, M.D. had 184 opioid claims in 2023 with an opioid prescribing rate of 3.2%.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,567 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Alonzo Williams, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Alonzo Williams, M.D.'s most frequently prescribed drugs include Omeprazole, Famotidine, Pantoprazole Sodium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alonzo Williams, M.D. accept Medicare? ▼
Alonzo Williams, M.D. appears in CMS Medicare data with 5,669 Part D claims and 970 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alonzo Williams, M.D.'s credentials? ▼
Alonzo Williams, M.D.'s NPI is 1326018581 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.