NPI registry status
Active
2026 NPPES data Rheumatology Physician NPI 1942389440 MD
Verify on CMS → Zainab Siddiqui, MD
Rheumatology 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 6,181 in Rheumatology 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
5K
Medicare Part D claims · 390 beneficiaries · Rheumatology Physician avg: 2K
Generic prescribing
90%
generic claims · 10% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$41.09
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Zainab Siddiqui, MD filed 4,957 Medicare Part D claims in 2023 as a Rheumatology Physician in Little Rock, Arkansas, prescribing 90% generic.
- 5K
- Part D claims, 2023
- 90%
- generic prescribing
- 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.
Zainab Siddiqui, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,957 Top 6% higher than 94% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. 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 Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Zainab Siddiqui, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Zainab Siddiqui, MD?
Quality data not reportedPrimary specialty
Rheumatology Physician
Medicare Part D claims
4,957 141% vs specialty avg
Specialty distribution in Arkansas
How Rheumatology Physician compares to other specialties among Arkansas providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Rheumatology Physician. Verify directly:
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).
Zainab Siddiqui, MD appears in the CMS NPPES registry as a Rheumatology Physician provider holding MD credentials at 10001 LILE DR, Little Rock, AR, 72205, with a listed phone of (501) 227-8000. NPI 1942389440 was issued on 11/03/2006.
Medicare Part D records for calendar year 2023 show 4,957 prescription claims written by this provider, covering 390 Medicare beneficiaries and totaling roughly $2.1 million in drug spend, split 10% brand-name and 90% generic by claim count, with an opioid prescribing rate of 2.9%.
Rheumatology Physician is a mid-sized specialty nationwide, with 6,181 enrolled providers across 52 states and an average of 2,054 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 | 1942389440 |
|---|---|
| Specialty | Rheumatology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 11/03/2006 |
Hospital and facility affiliations
Facilities where Zainab Siddiqui, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
St Vincent Medical Group
Little Rock, AR
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Zainab Siddiqui, MD. Source: openpaymentsdata.cms.gov.
Total received
$41
Largest payer
E.R. Squibb & Sons, L.L.C.
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.
Brand vs generic prescribing mix · Typical
Zainab Siddiqui, MD - brand share 10.0%
Rheumatology Physician average
10% brand-name claims vs 90% generic, on 4,957 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
4,957
Total Claims
$2.1M
Total Drug Cost
390
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 6,302
- Total Day Supply
- 183,540
- Brand vs Generic
- 10% brand / 90% generic
- Brand Drug Cost
- $2.0M
- Generic Drug Cost
- $129K
- Opioid Claims
- 145 (2.9% rate)
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 69.9 years
- Avg HCC Risk Score
- 1.50
- Gender Split
- 84% female / 16% male
- Age Distribution
- <65: 78, 65-74: 190, 75-84: 106, 85+: 16
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Zainab Siddiqui, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydroxychloroquine…
Hydroxychloroquine Sulfate
1,016 claims
- Methotrexate
Methotrexate
729 claims
- Prednisone 321
Prednisone
321 claims
- Gabapentin 259
Gabapentin
259 claims
- Allopurinol 206
Allopurinol
206 claims
- Folic Acid 188
Folic Acid
188 claims
- Leflunomide 158
Leflunomide
158 claims
- Meloxicam 148
Meloxicam
148 claims
| Drug | Claims |
|---|---|
| Hydroxychloroquine Sulfate | 1,016 |
| Methotrexate Methotrexate Sodium | 729 |
| Prednisone | 321 |
| Gabapentin | 259 |
| Allopurinol | 206 |
| Folic Acid | 188 |
| Leflunomide | 158 |
| Meloxicam | 148 |
| Mycophenolate Mofetil | 144 |
| Tramadol Hcl | 140 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Rheumatology Physician Overview
How Zainab Siddiqui, MD fits within the Rheumatology Physician landscape nationally.
6,181
Rheumatology Physician Providers in US
52
States with Rheumatology Physician
2,054
Avg Claims per Provider
Zainab Siddiqui, MD's 4,957 claims are above the specialty average of 2,054.
Nearby Rheumatology Physician Providers in Arkansas
Other clinicians with the same primary specialty enrolled in Arkansas, drawn from the same CMS NPPES roster as Siddiqui.
Dr. James Abraham
M.D.
Little Rock, AR
Dr. Tamer Alsebai
M.D.
Little Rock, AR
Dr. Preston Bandy
MD
Hot Springs, AR
Dr. Swetha Boddeda
MD
Conway, AR
Dr. Russell Branum
MD
Fort Smith, AR
Compare Rheumatology 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 Rheumatology 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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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Explore Arkansas
Frequently Asked Questions
What is Zainab Siddiqui, MD's specialty? ▼
Zainab Siddiqui, MD specializes in Rheumatology Physician and practices in Little Rock, Arkansas. Credentials: MD.
How much does Zainab Siddiqui, MD prescribe under Medicare Part D? ▼
In 2023, Zainab Siddiqui, MD wrote 4,957 Medicare Part D claims totaling $2.1M in drug costs for 390 beneficiaries.
Where is Zainab Siddiqui, MD located? ▼
Zainab Siddiqui, MD is located at 10001 LILE DR, Little Rock, AR, 72205. Phone: (501) 227-8000.
What is Zainab Siddiqui, MD's NPI number? ▼
Zainab Siddiqui, MD's National Provider Identifier (NPI) is 1942389440, issued on 11/03/2006.
Does Zainab Siddiqui, MD prescribe more brand-name or generic drugs? ▼
Zainab Siddiqui, MD's prescribing is 10% brand-name and 90% generic drugs by claim count, with $2.0M in brand drug costs.
Does Zainab Siddiqui, MD prescribe opioids? ▼
Yes, Zainab Siddiqui, MD had 145 opioid claims in 2023 with an opioid prescribing rate of 2.9%.
How many Rheumatology Physician providers are there in the US? ▼
There are 6,181 Rheumatology Physician providers across 52 states in the US. The average Rheumatology Physician provider writes 2,054 Medicare Part D claims per year.
What drugs does Zainab Siddiqui, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Zainab Siddiqui, MD's most frequently prescribed drugs include Hydroxychloroquine Sulfate, Methotrexate, Prednisone. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Zainab Siddiqui, MD accept Medicare? ▼
Zainab Siddiqui, MD appears in CMS Medicare data with 4,957 Part D claims and 390 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Zainab Siddiqui, MD's credentials? ▼
Zainab Siddiqui, MD's NPI is 1942389440 with credentials MD. 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.
- 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.