Dr. Gerald Simon, MD
- Medicare services, 2024
- 5,242
- Medicare patients, 2024
- 619
- Part D claims, 2024
- 14,498
- Hospital affiliations
- 6
- Industry payments
- $14,504
- Practice address
- 6438 Joliet Rd, Countryside, IL 60525
- Practice phone
- Call (708) 352-5222
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Nani Internal Med
Countryside, Illinois
Find Dr. Simon'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. Gerald Simon is an internist in Countryside, Illinois
Dr. Simon practices at Nani Internal Med in Countryside, Illinois.
Dr. Simon's NPI, 1861450330, was assigned on May 3, 2006. Dr. Simon graduated from Loyola University of Chicago, Stritch School of Medicine in 1982. Dr. Simon holds Illinois license 036066840.
- NPI
- 1861450330NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4688651334
- NPI enumeration date
- May 3, 2006
- NPI status
- Active
- Practice phone
- (708) 352-5222
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 70
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Gerald Simon practices at Nani Internal Med in Countryside, Illinois
Dr. Simon's primary practice is Nani Internal Med, at 6438 Joliet Rd, Countryside, IL 60525 in Cook County. The practice phone is (708) 352-5222.
- Nani Internal Med6438 Joliet Rd, Countryside, IL 60525 · Cook CountyPhone(708) 352-5222
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gerald Simon is affiliated with 21 sites of care and 2 medical groups
Dr. Simon's primary practice is Nani Internal Med in Countryside, Illinois. Dr. Simon is also affiliated with Edward Hospital. The medical group on file is Nephrology Associates of Northern Illinois and Indiana (NANI). Dmand AI also links Dr. Simon to 5 more hospitals, 5 skilled nursing facilities, 4 home health agencies, 3 hospices, 2 group practices and clinics and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Gerald Simon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Simon practices, 20 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Nani Internal Med | Available with a free account |
| +20 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gerald Simon is one of 5,652 internists in Illinois
Internal medicine is Dr. Simon's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Simon is licensed in Illinois.
Specialties and state licenses
- Internal medicine, IllinoisPrimary
Internists near Dr. Simon
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gerald Simon billed Medicare for 5,242 services in 2024
CMS data shows 5,242 Medicare services from Dr. Simon across 18 procedure codes in 2024, for 619 Medicare patients. Medicare paid $335,846 for them.
Dr. Simon's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 5,0232024: 4,54010%
- Other services
- 2023: 3882024: 56646%
- Tests and treatments
- 2023: 1272024: 1196%
- Lab and pathology
- 2023: 222024: 1723%
- Drugs given in the office
- 2023: 292024: 0100%
Where Dr. Simon's Medicare services took place, 2024
- In an office3,27562%
- In a facility1,96738%
Dr. Simon compared with the Illinois median for internists, 2024
- Dr. Simon
- Illinois median
- Medicare services
- 5,242vs 5669.3 times
- Medicare patients
- 619vs 2083.0 times
- Part D claims
- 13,506vs 28447.6 times
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Simon'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.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Simon and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gerald Simon treated 619 Medicare patients in 2024, average age 80
CMS counts 619 Medicare patients who saw Dr. Simon in 2024. The largest group is 75 to 84, with 265 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.72, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Simon's median patient age at 78, with 49% women.
Dr. Simon's Medicare patients by age, 2024
Dr. Simon's Medicare patients by sex, 2024
- Women34556%
- Men27444%
Chronic conditions among Dr. Simon's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Ischemic heart disease41%
- Diabetes37%
- Atrial fibrillation32%
- Chronic kidney disease30%
- Heart failure27%
Share of Medicare patients with each condition. A patient can have several.
Dr. Simon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 78
Patient panel by sex, all payers
- Women49%
- Men51%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gerald Simon wrote 14,498 Medicare Part D claims in 2024
In 2024, Dr. Simon wrote 14,498 Medicare Part D claims for 845 patients. 81% of them were for generic drugs. CMS names the drug for 13,506 of them, across 189 drugs with 11 or more claims each, at $1,321,776 in total drug cost. In 2023, CMS named 13,973 claims across 196 drugs.
Dr. Simon's Part D claims by kind of drug, 2024
- Generic11,764 claims81%
- Brand-name2,542 claims18%
- Other192 claims1%
Dr. Simon'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. Simon's Part D claims, 2024
- Opioids2%260 of 14,498 claims
- Antibiotics2%285 of 14,498 claims
- Antipsychotics, patients 65 and over1%201 of 14,498 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: 13,9732024: 13,5063%
Drugs named by CMS: 189 in 2024, 196 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
How Dr. Gerald Simon takes part in Medicare
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Source: Doctors and Clinicians Utilization Data (CMS)
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Dr. Gerald Simon received $14,504 in industry payments from 2016 to 2025
CMS Open Payments shows 912 general payments to Dr. Simon from 64 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 98% of the total. Amgen Inc. paid the most, $1,375.
General payments to Dr. Simon by program year, 2016 to 2025
General payments to Dr. Simon by kind, 2016 to 2025
- Food and beverage$14,25998%
- Education$2452%
Companies that paid Dr. Simon 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. Gerald Simon graduated from Loyola University of Chicago, Stritch School of Medicine
Dr. Simon graduated from Loyola University of Chicago, Stritch School of Medicine in 1982.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gerald Simon'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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 Utilization Data (CMS) (opens in a new tab) |
| 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. Gerald Simon
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. Gerald Simon's NPI number?
Dr. Gerald Simon's NPI number is 1861450330. It was assigned on May 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gerald Simon?
Dr. Gerald Simon is an internist in Countryside, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Gerald Simon practice?
Dr. Simon practices at 6438 Joliet Rd, Countryside, IL 60525. Dr. Simon's primary practice is Nani Internal Med in Countryside, Illinois. Dmand AI also links Dr. Simon to 5 hospitals, 5 skilled nursing facilities, 4 home health agencies, 3 hospices, 2 group practices and clinics and 1 medical group.
What is Dr. Gerald Simon's office phone number?
The practice phone on file for Dr. Simon is (708) 352-5222.
What is Dr. Gerald Simon's medical license number?
Dr. Simon holds Illinois license 036066840.
Which hospitals is Dr. Gerald Simon affiliated with?
Dr. Simon is affiliated with Edward Hospital. Dmand AI links Dr. Simon to 5 more hospitals.
What medical group is Dr. Gerald Simon part of?
Dr. Simon is linked to Nephrology Associates of Northern Illinois and Indiana (NANI). Dmand AI links Dr. Simon to 1 more medical group.
Does Dr. Gerald Simon accept Medicare?
Yes. CMS data shows Dr. Simon billed Medicare for 5,242 services in 2024.
How many Medicare patients does Dr. Gerald Simon see?
CMS counts 619 Medicare patients who saw Dr. Simon in 2024, with an average age of 80.
What services does Dr. Gerald Simon bill to Medicare?
In 2024, Dr. Simon's most billed Medicare services were care management and other visits (99490), hospital inpatient care (99232) and office visit, established patient (99214).
Show 4 more questionsShow fewer questions
Where did Dr. Gerald Simon go to medical school?
Dr. Simon graduated from Loyola University of Chicago, Stritch School of Medicine in 1982.
What drugs does Dr. Gerald Simon prescribe most?
In 2024 Medicare Part D data, Dr. Simon's most prescribed drugs by claims were Atorvastatin Calcium, Levothyroxine Sodium and Eliquis.
Has Dr. Gerald Simon received payments from drug or device companies?
CMS Open Payments shows $14,504 in general payments to Dr. Simon from 64 companies from 2016 to 2025. The largest total came from Amgen Inc.
How long has Dr. Gerald Simon been practicing?
Dr. Simon graduated from medical school in 1982, 44 years ago.
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