Dr. Willson H. Hartz III, MD
- Medicare services, 2021
- 187
- Part D claims, 2018
- 12
- Industry payments
- $3,135
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 676 N Saint Clair St, Chicago, IL 60611
- Practice phone
- Call (312) 943-5427
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Northwestern Surgical Associates
Surgical practice · Chicago, Illinois
Find Dr. Hartz'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. Willson H. Hartz III is a general surgeon in Chicago, Illinois
Dr. Hartz practices at Northwestern Surgical Associates in Chicago, Illinois.
Dr. Hartz's NPI, 1225084031, was assigned on May 25, 2006.
- NPI
- 1225084031NPI Registry (opens in a new tab)
- NPI enumeration date
- May 25, 2006
- NPI status
- Active
- Practice phone
- (312) 943-5427
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 79
- Medical school graduation
- 1973
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Willson H. Hartz III practices at 2 locations in Chicago, Illinois
Dr. Hartz's primary practice is Northwestern Surgical Associates, at 676 N Saint Clair St, Chicago, IL 60611. The practice phone is (312) 943-5427. The NPI Registry lists Dr. Hartz's practice address as 251 E Huron St, Chicago, IL 60611.
- Northwestern Surgical AssociatesPrimary676 N Saint Clair St, Chicago, IL 60611Phone(312) 943-5427
- NPI Registry address251 E Huron St, Chicago, IL 60611 · Cook CountyPhone(312) 951-5640
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Willson H. Hartz III is affiliated with 1 site of care and 1 medical group
Dr. Hartz's primary practice is Northwestern Surgical Associates in Chicago, Illinois. The medical group on file is Northwestern Surgical Associates.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Willson H. Hartz III's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Hartz practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Surgical Associates | 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 each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Willson H. Hartz III is one of 1,217 general surgeons in Illinois
Surgery is Dr. Hartz's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Hartz has a license on file in Illinois.
Specialties and state licenses
- Surgery, Illinois
General surgeons near Dr. Hartz
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. Willson H. Hartz III billed Medicare for 187 services in 2021
CMS data shows 187 Medicare services from Dr. Hartz across 6 procedure codes in 2021. Medicare paid $26,349 for them.
Dr. Hartz's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 1082021: 14938%
- Surgery
- 2020: 182021: 38111%
Where Dr. Hartz's Medicare services took place, 2021
- In an office14980%
- In a facility3820%
Dr. Hartz compared with the Illinois median for general surgeons, 2021
- Dr. Hartz
- Illinois median
- Medicare services
- 187vs 194Close to median
- Part D claims
- 12vs 2857% below
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Hartz's most billed Medicare procedure codes, 2021
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. Hartz?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Hartz and other general surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Willson H. Hartz III's patients have a median age of 23
Across all payers, Dmand AI patient panel data puts Dr. Hartz's median patient age at 23, with 100% women.
Dr. Hartz's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 23
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Willson H. Hartz III wrote 12 Medicare Part D claims in 2018
In 2018, Dr. Hartz wrote 12 Medicare Part D claims. They cover 1 drug, with $106 in total drug cost.
Dr. Hartz's most prescribed drugs by claims, 2018
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Willson H. Hartz III received $3,135 in industry payments from 2016 to 2022
CMS Open Payments shows 160 general payments to Dr. Hartz from 39 drug and device companies from 2016 to 2022. Food and beverage make up the largest share, 100% of the total. Covidien LP paid the most, $339.
General payments to Dr. Hartz by program year, 2016 to 2022
General payments to Dr. Hartz by kind, 2016 to 2022
- Food and beverage$3,121100%
- Education$140%
Companies that paid Dr. Hartz the most, 2016 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Willson H. Hartz III'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 Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (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. Willson H. Hartz III
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. Willson H. Hartz III's NPI number?
Dr. Willson H. Hartz III's NPI number is 1225084031. It was assigned on May 25, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Willson H. Hartz III?
Dr. Willson H. Hartz III is a general surgeon in Chicago, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Willson H. Hartz III practice?
Dr. Hartz practices at 676 N Saint Clair St, Chicago, IL 60611. Dr. Hartz also practices at 251 E Huron St, Chicago, IL 60611. Dr. Hartz's primary practice is Northwestern Surgical Associates in Chicago, Illinois.
What is Dr. Willson H. Hartz III's office phone number?
The practice phone on file for Dr. Hartz is (312) 943-5427.
What medical group is Dr. Willson H. Hartz III part of?
Dr. Hartz is linked to Northwestern Surgical Associates.
Does Dr. Willson H. Hartz III accept Medicare?
Yes. CMS data shows Dr. Hartz billed Medicare for 187 services in 2021.
What services does Dr. Willson H. Hartz III bill to Medicare?
In 2021, Dr. Hartz's most billed Medicare services were office visit, new patient (99203), office visit, established patient (99213) and surgery: digestive system (49505).
What drugs does Dr. Willson H. Hartz III prescribe most?
In 2018 Medicare Part D data, Dr. Hartz's most prescribed drugs by claims were Amoxicillin-Clavulanate Potass.
Has Dr. Willson H. Hartz III received payments from drug or device companies?
CMS Open Payments shows $3,135 in general payments to Dr. Hartz from 39 companies from 2016 to 2022. The largest total came from Covidien LP.
How long has Dr. Willson H. Hartz III been practicing?
Dr. Hartz graduated from medical school in 1973, 53 years ago.
Selling to surgery practices?
See general surgeons in Illinois by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card