Dr. Mallory Williams, MD
- Medicare services, 2023
- 283
- Hospital affiliations
- 2
- Industry payments
- $2,907
- Medical groups
- 3
- State licenses
- 3
- Practice address
- 1901 W Harrison St, Chicago, IL 60612
- Practice phone
- Call (312) 864-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Williams' 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. Mallory Williams is a general surgeon in Chicago, Illinois
Dr. Williams practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government.
Dr. Williams' NPI, 1669488003, was assigned on July 31, 2006. Dr. Williams holds District of Columbia license MD041969.
- NPI
- 1669488003NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4486729472
- NPI enumeration date
- July 31, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (312) 864-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mallory Williams practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois
Dr. Williams' primary practice is John H. Stroger, Jr. Hospital of Cook County, at 1901 W Harrison St, Chicago, IL 60612 in Cook County. The practice phone is (312) 864-6000.
- John H. Stroger, Jr. Hospital of Cook County1901 W Harrison St, Chicago, IL 60612 · Cook CountyPhone(312) 864-6000
Source: Dmand AI Affiliation Data
Dr. Mallory Williams is affiliated with 2 sites of care and 3 medical groups
Dr. Williams' primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government. Dr. Williams is also affiliated with University of Toledo Medical Center. The medical group on file is John H. Stroger, Jr. Hospital of Cook County. Dmand AI also links Dr. Williams to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mallory 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 |
|---|---|
| John H. Stroger, Jr. Hospital of Cook County | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Cook County Government and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mallory Williams is one of 1,217 general surgeons in Illinois
Surgery is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Williams' licenses on file in 3 states: District of Columbia, Massachusetts and Ohio.
Specialties and state licenses
- Surgery, District of ColumbiaPrimary
- Massachusetts license
- Ohio license
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. Mallory Williams billed Medicare for 283 services in 2023
CMS data shows 283 Medicare services from Dr. Williams across 7 procedure codes in 2023. Medicare paid $25,492 for them.
Dr. Williams' Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 3142023: 23525%
- Imaging
- 2022: 292023: 2417%
- Tests and treatments
- 2022: 292023: 2417%
Where Dr. Williams' Medicare services took place, 2023
- In an office217%
- In a facility26293%
Dr. Williams compared with the Illinois median for general surgeons, 2023
- Dr. Williams
- Illinois median
- Medicare services
- 283vs 19446% above
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2023
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. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other general surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mallory Williams' patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 71, with 42% women.
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 71
Patient panel by sex, all payers
- Women42%
- Men57%
Source: Dmand AI Patient Panel Data
How Dr. Mallory Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Mallory Williams received $2,907 in industry payments from 2018 to 2025
CMS Open Payments shows 42 general payments to Dr. Williams from 13 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 57% of the total. Acell, Inc. paid the most, $1,691.
General payments to Dr. Williams by program year, 2018 to 2025
General payments to Dr. Williams by kind, 2018 to 2025
- Food and beverage$1,64457%
- Travel and lodging$1,26243%
Companies that paid Dr. Williams the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mallory 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 | 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 Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Mallory 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. Mallory Williams' NPI number?
Dr. Mallory Williams' NPI number is 1669488003. It was assigned on July 31, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mallory Williams?
Dr. Mallory Williams is a general surgeon in Chicago, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Mallory Williams practice?
Dr. Williams practices at 1901 W Harrison St, Chicago, IL 60612. Dr. Williams' primary practice is John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois, part of Cook County Government. Dmand AI also links Dr. Williams to 2 medical groups, and a free account names each one.
What is Dr. Mallory Williams' office phone number?
The practice phone on file for Dr. Williams is (312) 864-6000. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Mallory Williams' email address?
Dmand AI checks professional and personal email addresses for Dr. Williams through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Mallory Williams' medical license number?
Dr. Williams holds District of Columbia license MD041969, one of the licenses on file in 3 states.
Which states has Dr. Mallory Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in District of Columbia, Massachusetts and Ohio.
Which hospitals is Dr. Mallory Williams affiliated with?
Dr. Williams practices at John H. Stroger, Jr. Hospital of Cook County in Chicago, Illinois. Dr. Williams is also affiliated with University of Toledo Medical Center.
What medical group is Dr. Mallory Williams part of?
Dr. Williams is linked to John H. Stroger, Jr. Hospital of Cook County. Dmand AI links Dr. Williams to 2 more medical groups, named with a free account.
Who does Dr. Mallory Williams practice with?
Dmand AI links 847 HCPs to Dr. Williams' primary medical group, 14 of them general surgeons. A free account lists them, with verified contacts.
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Does Dr. Mallory Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 283 services in 2023, and Dr. Williams accepts Medicare assignment.
What services does Dr. Mallory Williams bill to Medicare?
In 2023, Dr. Williams' most billed Medicare services were hospital inpatient care (99232), critical care (99291) and critical care (99292).
Has Dr. Mallory Williams received payments from drug or device companies?
CMS Open Payments shows $2,907 in general payments to Dr. Williams from 13 companies from 2018 to 2025. The largest total came from Acell, Inc.
How long has Dr. Mallory Williams been practicing?
Dr. Williams graduated from medical school in 1999, 27 years ago.
What EHR does Dr. Mallory Williams' practice use?
Dmand AI tracks the EHR system at John H. Stroger, Jr. Hospital of Cook County and at 1 more site and 2 medical groups. The vendor and product are available with a free Dmand AI account.
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