NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1114976685 MD
Verify on CMS → William Kessler, MD
Gastroenterology Physician in Indianapolis, Indiana.
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
817
Medicare Part D claims · 318 beneficiaries · Gastroenterology Physician avg: 833
Industry payments
$286.89
3 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
William Kessler, MD filed 817 Medicare Part D claims in 2023 as a Gastroenterology Physician in Indianapolis, Indiana.
- 817
- 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.
William Kessler, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
817 Top 27% higher than 73% 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)
William Kessler, 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 William Kessler, MD?
Quality data not reportedPrimary specialty
Gastroenterology Physician
Medicare Part D claims
817 2% vs specialty avg
Specialty distribution in Indiana
How Gastroenterology Physician compares to other specialties among Indiana 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 Gastroenterology 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).
William Kessler, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 550 UNIVERSITY BLVD, Indianapolis, IN, 46202, with a listed phone of (317) 944-3332. NPI 1114976685 was issued on 05/10/2006.
Medicare Part D records for calendar year 2023 show 817 prescription claims written by this provider, covering 318 Medicare beneficiaries and totaling roughly $135K in drug spend.
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 | 1114976685 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/10/2006 |
Hospital and facility affiliations
Facilities where William Kessler, 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.
Witham Memorial Hospital
Lebanon, IN
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 William Kessler, MD. Source: openpaymentsdata.cms.gov.
Total received
$287
Largest payer
STERIS CORPORATION
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.
817
Total Claims
$135K
Total Drug Cost
318
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,427
- Total Day Supply
- 36,244
- Generic Drug Cost
- $45K
Patient Demographics
- Average Patient Age
- 70.3 years
- Avg HCC Risk Score
- 1.42
- Gender Split
- 55% female / 45% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Kessler, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
121 claims
- Omeprazole
Omeprazole
88 claims
- Peg 3350-Electrolyte
Peg 3350-Electrolyte
63 claims
- Colestipol Hcl
Colestipol Hcl
50 claims
- Dexlansoprazole Dr 34
Dexlansoprazole Dr
34 claims
- Linzess 33
Linzess
33 claims
- Esomeprazole Magne… 30
Esomeprazole Magnesium
30 claims
- Lubiprostone 29
Lubiprostone
29 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 121 |
| Omeprazole | 88 |
| Peg 3350-Electrolyte Sodium Chloride/Nahco3/Kcl/Peg | 63 |
| Colestipol Hcl | 50 |
| Dexlansoprazole Dr Dexlansoprazole | 34 |
| Linzess Linaclotide | 33 |
| Esomeprazole Magnesium | 30 |
| Lubiprostone | 29 |
| Dicyclomine Hcl | 26 |
| Famotidine | 26 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How William Kessler, MD fits within the Gastroenterology Physician landscape nationally.
16,567
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
William Kessler, MD's 817 claims are below the specialty average of 833.
Nearby Gastroenterology Physician Providers in Indiana
Other clinicians with the same primary specialty enrolled in Indiana, drawn from the same CMS NPPES roster as Kessler.
Dr. Khaled Abdeljawad
M.D
Indianapolis, IN
Dr. Amarnath Agrawal
M.D.
Chesterton, IN
Dr. Furqan Ahmed
M.D.
Indianapolis, IN
Dr. Kashif Ahmed
MD
Indianapolis, IN
Dr. Moiz Ahmed
M.D.
Indianapolis, IN
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 Indiana 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 William Kessler, MD's specialty? ▼
William Kessler, MD specializes in Gastroenterology Physician and practices in Indianapolis, Indiana. Credentials: MD.
How much does William Kessler, MD prescribe under Medicare Part D? ▼
In 2023, William Kessler, MD wrote 817 Medicare Part D claims totaling $135K in drug costs for 318 beneficiaries.
Where is William Kessler, MD located? ▼
William Kessler, MD is located at 550 UNIVERSITY BLVD, Indianapolis, IN, 46202. Phone: (317) 944-3332.
What is William Kessler, MD's NPI number? ▼
William Kessler, MD's National Provider Identifier (NPI) is 1114976685, issued on 05/10/2006.
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 William Kessler, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Kessler, MD's most frequently prescribed drugs include Pantoprazole Sodium, Omeprazole, Peg 3350-Electrolyte. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Kessler, MD accept Medicare? ▼
William Kessler, MD appears in CMS Medicare data with 817 Part D claims and 318 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Kessler, MD's credentials? ▼
William Kessler, MD's NPI is 1114976685 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.