NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1881853596 MD
Verify on CMS → Shakthi Kumar, MD
Gastroenterology Physician in Elmhurst, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,601 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
522
Medicare Part D claims · 277 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
83%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
91.4/100
▲ 8 pts above national avg 83.1 · Exceptional
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
Shakthi Kumar, MD reported a CMS MIPS final score of 91.4/100 - above the 83.1 national average - and filed 522 Medicare Part D claims in 2023.
- 91.4/100
- MIPS score · +8 vs avg
- 522
- Part D claims, 2023
- 83%
- 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.
Shakthi Kumar, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
91 Top 37% higher than 63% 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 Shakthi Kumar, MD 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, Shakthi Kumar, MD writes more Part D claims than 34% of them and scores higher on MIPS quality than 69% - placing this provider in the lower-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 Shakthi Kumar, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Shakthi Kumar, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Shakthi Kumar, MD?
High performer (top quartile)Primary specialty
Gastroenterology Physician
Medicare Part D claims
522 37% vs specialty avg
MIPS final score
91.4/100 8.3 pts vs avg
Specialty distribution in Illinois
How Gastroenterology Physician compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Shakthi Kumar, MD's 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 91.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Gastroenterology Physician) - 91.4/100 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).
Shakthi Kumar, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 133 E BRUSH HILL RD STE 310, Elmhurst, IL, 60126, with a listed phone of (331) 221-9003. NPI 1881853596 was issued on 06/06/2008.
Medicare Part D records for calendar year 2023 show 522 prescription claims written by this provider, covering 277 Medicare beneficiaries and totaling roughly $175K in drug spend, split 17% brand-name and 83% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 91.4/100 for the 2023 performance year (Quality 82.7), compared with the national average of 83.1.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,601 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 | 1881853596 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/06/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
91.3557
Final Score
Avg: 83.1
82.7114
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Shakthi Kumar, 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.
Endeavor Health Medical Group
Elmhurst, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Shakthi Kumar, MD. To verify Shakthi Kumar, MD's current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Shakthi Kumar, MD - brand share 17.0%
Gastroenterology Physician average
17% brand-name claims vs 83% generic, on 522 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.
522
Total Claims
$175K
Total Drug Cost
277
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 942
- Total Day Supply
- 22,893
- Brand vs Generic
- 17% brand / 83% generic
- Brand Drug Cost
- $164K
- Generic Drug Cost
- $12K
- Antibiotic Claims
- 39
Patient Demographics
- Average Patient Age
- 71.0 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 34, 65-74: 165, 75-84: 67, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Shakthi Kumar, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
113 claims
- Omeprazole
Omeprazole
74 claims
- Linzess 32
Linzess
32 claims
- Peg 3350-Electrolyte 20
Peg 3350-Electrolyte
20 claims
- Budesonide Dr 18
Budesonide Dr
18 claims
- Diphenoxylate-Atro… 12
Diphenoxylate-Atropine
12 claims
- Amoxicillin 11
Amoxicillin
11 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 113 |
| Omeprazole | 74 |
| Linzess Linaclotide | 32 |
| Peg 3350-Electrolyte Sodium Chloride/Nahco3/Kcl/Peg | 20 |
| Budesonide Dr Budesonide | 18 |
| Diphenoxylate-Atropine Diphenoxylate Hcl/Atropine | 12 |
| Amoxicillin | 11 |
| Gavilyte-G "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Shakthi Kumar, MD fits within the Gastroenterology Physician landscape nationally.
16,601
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Shakthi Kumar, MD's 522 claims are below the specialty average of 833.
Nearby Gastroenterology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Kumar.
Dr. Abdul Aadam
M.D.
Chicago, IL
Dr. Richard Aaronson
M.D.
Olympia Fields, IL
Dr. Abdelhai Abdelqader
MD
Maywood, IL
Dr. Mustafa Abdul-Hussein
MD
Mattoon, IL
Dr. Ayokunle Abegunde
M.D.
Maywood, IL
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 Illinois 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 Shakthi Kumar, MD's specialty? ▼
Shakthi Kumar, MD specializes in Gastroenterology Physician and practices in Elmhurst, Illinois. Credentials: MD.
How much does Shakthi Kumar, MD prescribe under Medicare Part D? ▼
In 2023, Shakthi Kumar, MD wrote 522 Medicare Part D claims totaling $175K in drug costs for 277 beneficiaries.
What is Shakthi Kumar, MD's Medicare quality score? ▼
Shakthi Kumar, MD has a CMS MIPS Final Score of 91.4/100 (Quality: 82.7). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Shakthi Kumar, MD located? ▼
Shakthi Kumar, MD is located at 133 E BRUSH HILL RD STE 310, Elmhurst, IL, 60126. Phone: (331) 221-9003.
What is Shakthi Kumar, MD's NPI number? ▼
Shakthi Kumar, MD's National Provider Identifier (NPI) is 1881853596, issued on 06/06/2008.
Does Shakthi Kumar, MD prescribe more brand-name or generic drugs? ▼
Shakthi Kumar, MD's prescribing is 17% brand-name and 83% generic drugs by claim count, with $164K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,601 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 Shakthi Kumar, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Shakthi Kumar, MD's most frequently prescribed drugs include Pantoprazole Sodium, Omeprazole, Linzess. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Shakthi Kumar, MD accept Medicare? ▼
Shakthi Kumar, MD appears in CMS Medicare data with 522 Part D claims and 277 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Shakthi Kumar, MD's credentials? ▼
Shakthi Kumar, MD's NPI is 1881853596 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.
- 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.