Dr. Gretchen Kathleen Williams, DO
- Medicare services, 2024
- 386
- Medicare patients, 2024
- 252
- Part D claims, 2024
- 75
- Hospital affiliations
- 1
- Industry payments
- $14,661
- Practice address
- 400 N Wall St, Kankakee, IL 60901
- Practice phone
- Call (815) 933-1671
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Riverside Health System
Kankakee, Illinois
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Gretchen Kathleen Williams is a general surgeon in Kankakee, Illinois
Dr. Williams practices at Riverside Health System in Kankakee, Illinois.
Dr. Williams' NPI, 1659663581, was assigned on May 11, 2011. Dr. Williams graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2011. Dr. Williams holds Michigan license 5101019120.
- NPI
- 1659663581NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0143517151
- NPI enumeration date
- May 11, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (815) 933-1671
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gretchen Kathleen Williams practices at Riverside Health System in Kankakee, Illinois
Dr. Williams' primary practice is Riverside Health System, at 400 N Wall St, Kankakee, IL 60901 in Kankakee County. The practice phone is (815) 933-1671.
- Riverside Health System400 N Wall St, Kankakee, IL 60901 · Kankakee CountyPhone(815) 933-1671
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Gretchen Kathleen Williams is affiliated with 3 sites of care and 1 medical group
Dr. Williams' primary practice is Riverside Health System in Kankakee, Illinois. Dr. Williams is also affiliated with Riverside Medical Center. The medical group on file is Riverside Healthcare. Dmand AI also links Dr. Williams to 1 more group practice or clinic, 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. Gretchen Kathleen Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Riverside Health System | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gretchen Kathleen Williams is one of 1,217 general surgeons in Illinois
Surgery is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Williams is licensed in Michigan.
Specialties and state licenses
- Surgery, MichiganPrimary
General surgeons near Dr. Williams
Counts of general surgeons 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. Gretchen Kathleen Williams billed Medicare for 386 services in 2024
CMS data shows 386 Medicare services from Dr. Williams across 9 procedure codes in 2024, for 252 Medicare patients. Medicare paid $34,324 for them.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 3632024: 3611%
- Surgery
- 2023: 532024: 2553%
Where Dr. Williams' Medicare services took place, 2024
- In an office19851%
- In a facility18849%
Dr. Williams compared with the Illinois median for general surgeons, 2024
- Dr. Williams
- Illinois median
- Medicare services
- 386vs 19499% above
- Medicare patients
- 252vs 14475% above
- Part D claims
- 28vs 28Close to median
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Williams' 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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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gretchen Kathleen Williams treated 252 Medicare patients in 2024, average age 72
CMS counts 252 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 111 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 18% are also on Medicaid. Their average risk score is 1.70, 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. Williams' median patient age at 68, with 59% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women14256%
- Men11044%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis49%
- Ischemic heart disease38%
- Diabetes32%
- Chronic kidney disease31%
- Cancer30%
- Anxiety29%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 68
Patient panel by sex, all payers
- Women59%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Gretchen Kathleen Williams wrote 75 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 75 Medicare Part D claims for 55 patients. 97% of them were for generic drugs. CMS names the drug for 28 of them, across 1 drug with 11 or more claims each, at $90 in total drug cost. In 2023, CMS named 35 claims across 2 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic73 claims97%
- Brand-name and other2 claims3%
Dr. Williams' 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. Williams' Part D claims, 2024
- Opioids45%34 of 75 claims
- Antibiotics28%21 of 75 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: 352024: 2820%
Drugs named by CMS: 1 in 2024, 2 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. Gretchen Kathleen Williams ranks in the 91st percentile for hernia repair - groin (open) in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 12 procedures of hernia repair - groin (open) by Dr. Williams, more than 91% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Williams ranks in Medicare procedure volume
- Colonoscopy
- 55th percentile32 procedures
- Mastectomy
- 82nd percentile24 procedures
- Hernia repair - groin (open)
- 91st percentile12 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Skin biopsy: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Gretchen Kathleen Williams received $14,661 in industry payments from 2016 to 2025
CMS Open Payments shows 37 general payments to Dr. Williams from 9 drug and device companies from 2016 to 2025. Education make up the largest share, 85% of the total. Intuitive Surgical, Inc. paid the most, $14,301.
General payments to Dr. Williams by program year, 2016 to 2025
General payments to Dr. Williams by kind, 2016 to 2025
- Education$12,50085%
- Travel and lodging$1,1958%
- Food and beverage$9667%
Companies that paid Dr. Williams 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. Gretchen Kathleen Williams graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville
Dr. Williams graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2011.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gretchen Kathleen Williams'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 National Downloadable File (CMS) (opens in a new tab)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. Gretchen Kathleen Williams
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. Gretchen Kathleen Williams' NPI number?
Dr. Gretchen Kathleen Williams' NPI number is 1659663581. It was assigned on May 11, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Gretchen Kathleen Williams?
Dr. Gretchen Kathleen Williams is a general surgeon in Kankakee, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Gretchen Kathleen Williams practice?
Dr. Williams practices at 400 N Wall St, Kankakee, IL 60901. Dr. Williams' primary practice is Riverside Health System in Kankakee, Illinois. Dmand AI also links Dr. Williams to 1 group practice or clinic.
What is Dr. Gretchen Kathleen Williams' office phone number?
The practice phone on file for Dr. Williams is (815) 933-1671.
What is Dr. Gretchen Kathleen Williams' medical license number?
Dr. Williams holds Michigan license 5101019120.
Which hospitals is Dr. Gretchen Kathleen Williams affiliated with?
Dr. Williams is affiliated with Riverside Medical Center.
What medical group is Dr. Gretchen Kathleen Williams part of?
Dr. Williams is linked to Riverside Healthcare.
Does Dr. Gretchen Kathleen Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 386 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Gretchen Kathleen Williams see?
CMS counts 252 Medicare patients who saw Dr. Williams in 2024, with an average age of 72.
What services does Dr. Gretchen Kathleen Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were office visit, new patient (99203), hospital inpatient care (99222) and hospital inpatient care (99232).
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Where did Dr. Gretchen Kathleen Williams go to medical school?
Dr. Williams graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2011.
What drugs does Dr. Gretchen Kathleen Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Gretchen Kathleen Williams received payments from drug or device companies?
CMS Open Payments shows $14,661 in general payments to Dr. Williams from 9 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Gretchen Kathleen Williams been practicing?
Dr. Williams graduated from medical school in 2011, 15 years ago.
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