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Dr. Don Cassidy Arnold II, MD
NPI1457501926PAC ID7517137995
- Medicare services, 2024
- 1,192
- Medicare patients, 2024
- 553
- Part D claims, 2024
- 903
- Publications
- 1
- Hospital affiliations
- 5
- Practice address
- 201 S 14th St, Herrin, IL 62948
- Practice phone
- Call (618) 942-2171
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Arnold's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Don Cassidy Arnold II is a urologist in Herrin, Illinois
Dr. Arnold practices at SIH Herrin Hospital in Herrin, Illinois, part of Southern Illinois Healthcare.
Dr. Arnold's NPI, 1457501926, was assigned on September 22, 2008. Dr. Arnold graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2005. Dr. Arnold holds Illinois license 036.131997.
NPI and contact details
- NPI
- 1457501926NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7517137995
- NPI enumeration date
- September 22, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (618) 942-2171
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Don Cassidy Arnold II practices at SIH Herrin Hospital in Herrin, Illinois
Dr. Arnold's primary practice is SIH Herrin Hospital, at 201 S 14th St, Herrin, IL 62948 in Williamson County. The practice phone is (618) 942-2171.
- SIH Herrin Hospital201 S 14th St, Herrin, IL 62948 · Williamson CountyPhone(618) 942-2171
Source: Dmand AI Affiliation Data
Dr. Don Cassidy Arnold II is affiliated with 7 sites of care and 2 medical groups
Dr. Arnold's primary practice is SIH Herrin Hospital in Herrin, Illinois, part of Southern Illinois Healthcare. Dr. Arnold is also affiliated with OSF Saint Francis Medical Center. The medical group on file is Southern Illinois Healthcare (SIH). Dmand AI also links Dr. Arnold to 3 more hospitals, 2 group practices and clinics and 1 medical group, each named with a free account.
OSF Saint Francis Medical CenterSouthern Illinois Healthcare (SIH)3 hospitalsNames with a free account2 group practices and clinicsNames with a free account1 medical groupName with a free account
See all 9 affiliations for Dr. ArnoldSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Don Cassidy Arnold II's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Arnold practices, 7 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| SIH Herrin Hospital | Available with a free account |
| +6 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Don Cassidy Arnold II is one of 513 urologists in Illinois
Urology is Dr. Arnold's primary specialty in the NPI Registry, under taxonomy code 208800000X. Dr. Arnold is licensed in Illinois.
Specialties and state licenses
- Urology, IllinoisPrimary
Urologists near Dr. Arnold
Counts of urologists with a Dmand AI profile, by place and practice. Each opens the list.
513urologists in Illinois
2urologists in Herrin
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Don Cassidy Arnold II billed Medicare for 1,192 services in 2024
CMS data shows 1,192 Medicare services from Dr. Arnold across 21 procedure codes in 2024, for 553 Medicare patients. Medicare paid $93,699 for them.
Medicare services, 20241,192
Medicare patients553
Paid by Medicare$93,699
Procedure codes21
Dr. Arnold's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7502024: 55426%
- Surgery
- 2023: 5772024: 41029%
- Imaging
- 2023: 1432024: 1516%
- Other services
- 2023: 02024: 77
Where Dr. Arnold's Medicare services took place, 2024
- In an office73862%
- In a facility45438%
Dr. Arnold compared with the Illinois median for urologists, 2024
- Dr. Arnold
- Illinois median
- Medicare services
- 1,192vs 1,32310% below
- Medicare patients
- 553vs 49013% above
- Part D claims
- 817vs 3582.3 times
Medians across 498 urologists in Illinois with Dmand AI profiles that report each measure.
Dr. Arnold's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Arnold?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Arnold and other urologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Don Cassidy Arnold II treated 553 Medicare patients in 2024, average age 73
CMS counts 553 Medicare patients who saw Dr. Arnold in 2024. The largest group is 65 to 74, with 257 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 22% are also on Medicaid. Their average risk score is 1.49, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Arnold's median patient age at 73, with 30% women.
Medicare patients, 2024553
Average age73
Average risk score1.49
Also on Medicaid22%
Dr. Arnold's Medicare patients by age, 2024
Dr. Arnold's Medicare patients by sex, 2024
- Women18533%
- Men36867%
Chronic conditions among Dr. Arnold's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Diabetes39%
- Cancer38%
- Anxiety36%
- Ischemic heart disease35%
- Chronic kidney disease31%
Share of Medicare patients with each condition. A patient can have several.
Dr. Arnold's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women30%
- Men69%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Don Cassidy Arnold II wrote 903 Medicare Part D claims in 2024
In 2024, Dr. Arnold wrote 903 Medicare Part D claims for 339 patients. 92% of them were for generic drugs. CMS names the drug for 817 of them, across 15 drugs with 11 or more claims each, at $44,608 in total drug cost. In 2023, CMS named 891 claims across 19 drugs.
Part D claims, 2024903
Drugs named by CMS15
Total drug cost$44,608
Part D patients339
Dr. Arnold's Part D claims by kind of drug, 2024
- Generic828 claims92%
- Brand-name75 claims8%
Dr. Arnold's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Arnold's Part D claims, 2024
- Opioids3%27 of 903 claims
- Antibiotics38%344 of 903 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 8912024: 8178%
Drugs named by CMS: 15 in 2024, 19 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Don Cassidy Arnold II offers telehealth to Medicare patients
Dr. Arnold accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Arnold as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Don Cassidy Arnold II has 1 publication on record
Dmand AI links 1 paper to Dr. Arnold in 2019. Dr. Arnold's most frequent co-author is Scott William Mack, MD.
Papers1
Dr. Arnold's most frequent co-authors
Recent publications by Dr. Arnold
See who Dr. Arnold researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Arnold works with, so you can find a warm path to the right urologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Don Cassidy Arnold II received $84,117 in industry payments from 2016 to 2025
CMS Open Payments shows 424 general payments to Dr. Arnold from 50 drug and device companies from 2016 to 2025. Consulting fees make up the largest share, 62% of the total. Stryker Corporation paid the most, $39,137.
General payments to Dr. Arnold by program year, 2016 to 2025
General payments to Dr. Arnold by kind, 2016 to 2025
$84.1Kin total
- Consulting fees$52,36762%
- Travel and lodging$14,42017%
- Food and beverage$13,98817%
- Speaker and faculty fees$2,4153%
- Education$9261%
Companies that paid Dr. Arnold the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Don Cassidy Arnold II graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb)
Dr. Arnold graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2005.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Don Cassidy Arnold II's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Don Cassidy Arnold II
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Don Cassidy Arnold II's NPI number?
Dr. Don Cassidy Arnold II's NPI number is 1457501926. It was assigned on September 22, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Don Cassidy Arnold II?
Dr. Don Cassidy Arnold II is a urologist in Herrin, Illinois. The primary specialty in the NPI Registry is Urology Physician (taxonomy code 208800000X).
Where does Dr. Don Cassidy Arnold II practice?
Dr. Arnold practices at 201 S 14th St, Herrin, IL 62948. Dr. Arnold's primary practice is SIH Herrin Hospital in Herrin, Illinois, part of Southern Illinois Healthcare. Dmand AI also links Dr. Arnold to 3 hospitals, 2 group practices and clinics and 1 medical group.
What is Dr. Don Cassidy Arnold II's office phone number?
The practice phone on file for Dr. Arnold is (618) 942-2171.
What is Dr. Don Cassidy Arnold II's medical license number?
Dr. Arnold holds Illinois license 036.131997.
Which hospitals is Dr. Don Cassidy Arnold II affiliated with?
Dr. Arnold practices at SIH Herrin Hospital in Herrin, Illinois. Dr. Arnold is also affiliated with OSF Saint Francis Medical Center. Dmand AI links Dr. Arnold to 3 more hospitals.
What medical group is Dr. Don Cassidy Arnold II part of?
Dr. Arnold is linked to Southern Illinois Healthcare (SIH). Dmand AI links Dr. Arnold to 1 more medical group.
Does Dr. Don Cassidy Arnold II accept Medicare?
Yes. CMS data shows Dr. Arnold billed Medicare for 1,192 services in 2024, and Dr. Arnold accepts Medicare assignment.
Does Dr. Don Cassidy Arnold II offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Arnold as offering telehealth services.
How many Medicare patients does Dr. Don Cassidy Arnold II see?
CMS counts 553 Medicare patients who saw Dr. Arnold in 2024, with an average age of 73.
Show 7 more questionsShow fewer questions
What services does Dr. Don Cassidy Arnold II bill to Medicare?
In 2024, Dr. Arnold's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and diagnostic imaging (74420).
Where did Dr. Don Cassidy Arnold II go to medical school?
Dr. Arnold graduated from University of Illinois College of Med (Chi/Peor/Rock/Chm-Urb) in 2005.
What drugs does Dr. Don Cassidy Arnold II prescribe most?
In 2024 Medicare Part D data, Dr. Arnold's most prescribed drugs by claims were Tamsulosin HCl, Cephalexin and Ciprofloxacin HCl.
Has Dr. Don Cassidy Arnold II received payments from drug or device companies?
CMS Open Payments shows $84,117 in general payments to Dr. Arnold from 50 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Don Cassidy Arnold II been practicing?
Dr. Arnold graduated from medical school in 2005, 21 years ago.
Does Dr. Don Cassidy Arnold II do research?
Dmand AI links 1 publication to Dr. Arnold.
Who does Dr. Don Cassidy Arnold II publish with?
Dr. Arnold's most frequent co-authors are Scott William Mack, MD (1 shared paper).
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