NPI registry status
Active
2026 NPPES data Radiation Oncology Physician NPI 1770574881 M.D.
Verify on CMS → William Hartsell, M.D.
Radiation Oncology Physician in Warrenville, 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 6,018 in Radiation Oncology 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
298
Medicare Part D claims · 116 beneficiaries · Radiation Oncology Physician avg: 186
Generic prescribing
92%
generic claims · 8% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$77.56
3 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
William Hartsell, M.D. filed 298 Medicare Part D claims in 2023 as a Radiation Oncology Physician in Warrenville, Illinois, prescribing 92% generic.
- 298
- Part D claims, 2023
- 92%
- 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.
William Hartsell, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
298 49th percentile higher than 49% 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 Hartsell, M.D. 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 Hartsell, M.D.?
Quality data not reportedPrimary specialty
Radiation Oncology Physician
Medicare Part D claims
298 60% vs specialty avg
Specialty distribution in Illinois
How Radiation Oncology Physician compares to other specialties among Illinois 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 Radiation Oncology 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 Hartsell, M.D. appears in the CMS NPPES registry as a Radiation Oncology Physician provider holding M.D. credentials at 4455 WEAVER PKWY, Warrenville, IL, 60555, with a listed phone of (630) 821-6400. NPI 1770574881 was issued on 10/31/2005.
Medicare Part D records for calendar year 2023 show 298 prescription claims written by this provider, covering 116 Medicare beneficiaries and totaling roughly $64K in drug spend, split 8% brand-name and 92% generic by claim count, with an opioid prescribing rate of 5.7%.
Radiation Oncology Physician is a mid-sized specialty nationwide, with 6,018 enrolled providers across 52 states and an average of 186 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 | 1770574881 |
|---|---|
| Specialty | Radiation Oncology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 10/31/2005 |
Hospital and facility affiliations
Facilities where William Hartsell, M.D. 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.
Radiation Oncology Consultants, Ltd
Warrenville, 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).
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 Hartsell, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$78
Largest payer
Novartis Pharmaceuticals 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.
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 William Hartsell, M.D.. To verify William Hartsell, M.D.'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 · Generic-heavy
William Hartsell, M.D. - brand share 8.0%
Radiation Oncology Physician average
8% brand-name claims vs 92% generic, on 298 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.
298
Total Claims
$64K
Total Drug Cost
116
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 471
- Total Day Supply
- 11,486
- Brand vs Generic
- 8% brand / 92% generic
- Brand Drug Cost
- $53K
- Generic Drug Cost
- $11K
- Opioid Claims
- 17 (5.7% rate)
- Antibiotic Claims
- 55
Patient Demographics
- Average Patient Age
- 72.9 years
- Avg HCC Risk Score
- 0.96
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Hartsell, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tamsulosin Hcl
Tamsulosin Hcl
111 claims
- Ciprofloxacin Hcl 33
Ciprofloxacin Hcl
33 claims
- Alfuzosin Hcl Er 20
Alfuzosin Hcl Er
20 claims
- Orgovyx 19
Orgovyx
19 claims
- Hydrocodone-Acetam… 17
Hydrocodone-Acetaminophen
17 claims
- Methylprednisolone 17
Methylprednisolone
17 claims
- Silodosin 14
Silodosin
14 claims
- Sulfamethoxazole-T… 13
Sulfamethoxazole-Trimethoprim
13 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 111 |
| Ciprofloxacin Hcl | 33 |
| Alfuzosin Hcl Er Alfuzosin Hcl | 20 |
| Orgovyx Relugolix | 19 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 17 |
| Methylprednisolone | 17 |
| Silodosin | 14 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Radiation Oncology Physician Overview
How William Hartsell, M.D. fits within the Radiation Oncology Physician landscape nationally.
6,018
Radiation Oncology Physician Providers in US
52
States with Radiation Oncology Physician
186
Avg Claims per Provider
William Hartsell, M.D.'s 298 claims are above the specialty average of 186.
Nearby Radiation Oncology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Hartsell.
Dr. Mohamed Abazeed
MD, PHD
Chicago, IL
Dr. Christopher Abraham
MD
Springfield, IL
Dr. Ross Abrams
M.D.
Chicago, IL
Dr. Iftekhar Ahmad
M.D.
Rockford, IL
Dr. Elke Aippersbach
M.D.,M.SC.,
Oak Lawn, IL
Compare Radiation Oncology 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 Radiation Oncology 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 Hartsell, M.D.'s specialty? ▼
William Hartsell, M.D. specializes in Radiation Oncology Physician and practices in Warrenville, Illinois. Credentials: M.D..
How much does William Hartsell, M.D. prescribe under Medicare Part D? ▼
In 2023, William Hartsell, M.D. wrote 298 Medicare Part D claims totaling $64K in drug costs for 116 beneficiaries.
Where is William Hartsell, M.D. located? ▼
William Hartsell, M.D. is located at 4455 WEAVER PKWY, Warrenville, IL, 60555. Phone: (630) 821-6400.
What is William Hartsell, M.D.'s NPI number? ▼
William Hartsell, M.D.'s National Provider Identifier (NPI) is 1770574881, issued on 10/31/2005.
Does William Hartsell, M.D. prescribe more brand-name or generic drugs? ▼
William Hartsell, M.D.'s prescribing is 8% brand-name and 92% generic drugs by claim count, with $53K in brand drug costs.
Does William Hartsell, M.D. prescribe opioids? ▼
Yes, William Hartsell, M.D. had 17 opioid claims in 2023 with an opioid prescribing rate of 5.7%.
How many Radiation Oncology Physician providers are there in the US? ▼
There are 6,018 Radiation Oncology Physician providers across 52 states in the US. The average Radiation Oncology Physician provider writes 186 Medicare Part D claims per year.
What drugs does William Hartsell, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Hartsell, M.D.'s most frequently prescribed drugs include Tamsulosin Hcl, Ciprofloxacin Hcl, Alfuzosin Hcl Er. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Hartsell, M.D. accept Medicare? ▼
William Hartsell, M.D. appears in CMS Medicare data with 298 Part D claims and 116 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Hartsell, M.D.'s credentials? ▼
William Hartsell, M.D.'s NPI is 1770574881 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.
- 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.