Dr. Zachary Willis, DO
- Medicare services, 2020
- 24
- Part D claims, 2024
- 15
- Hospital affiliations
- 1
- Industry payments
- $2,053
- Medical groups
- 2
- Practice address
- 6800 State Route 162, Maryville, IL 62062
- Practice phone
- Call (618) 288-5711
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Willis' 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. Zachary Willis is a general surgeon in Maryville, Illinois
Dr. Willis practices at Anderson Hospital in Maryville, Illinois, part of Anderson Healthcare.
Dr. Willis' NPI, 1265847016, was assigned on June 30, 2014. Dr. Willis holds Missouri license 2014017955.
- NPI
- 1265847016NPI Registry (opens in a new tab)
- NPI enumeration date
- June 30, 2014
- NPI status
- Active
- Practice phone
- (618) 288-5711
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. Zachary Willis practices at Anderson Hospital in Maryville, Illinois
Dr. Willis' primary practice is Anderson Hospital, at 6800 State Route 162, Maryville, IL 62062 in Madison County. The practice phone is (618) 288-5711.
- Anderson Hospital6800 State Route 162, Maryville, IL 62062 · Madison CountyPhone(618) 288-5711
Source: Dmand AI Affiliation Data
Dr. Zachary Willis is affiliated with 3 sites of care and 2 medical groups
Dr. Willis' primary practice is Anderson Hospital in Maryville, Illinois, part of Anderson Healthcare. Dmand AI also links Dr. Willis to 2 group practices and clinics and 2 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. Zachary Willis' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Willis practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Anderson Hospital | Available with a free account |
| +2 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Zachary Willis is one of 1,217 general surgeons in Illinois
Surgery is Dr. Willis' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Willis is licensed in Missouri.
Specialties and state licenses
- Surgery, MissouriPrimary
General surgeons near Dr. Willis
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. Zachary Willis billed Medicare for 24 services in 2020
CMS data shows 24 Medicare services from Dr. Willis across 1 procedure code in 2020. Medicare paid $1,352 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Willis' Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 262020: 248%
Dr. Willis compared with the Illinois median for general surgeons, 2020
- Dr. Willis
- Illinois median
- Medicare services
- 24vs 19488% below
- Part D claims
- 115vs 284.1 times
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Willis' most billed Medicare procedure codes, 2020
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. Zachary Willis' patients have a median age of 33
Across all payers, Dmand AI patient panel data puts Dr. Willis' median patient age at 33, with 100% women.
Dr. Willis' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 33
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Zachary Willis wrote 15 Medicare Part D claims in 2024
In 2024, Dr. Willis wrote 15 Medicare Part D claims. 100% of them were for generic drugs. They cover 6 drugs, with $781 in total drug cost.
Dr. Willis' most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
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
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Dr. Zachary Willis received $2,053 in industry payments from 2016 to 2025
CMS Open Payments shows 31 general payments to Dr. Willis from 15 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Sientra, Inc. paid the most, $1,102.
General payments to Dr. Willis by program year, 2016 to 2025
Companies that paid Dr. Willis the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Zachary Willis'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 |
| 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) |
| 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. Zachary Willis
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. Zachary Willis' NPI number?
Dr. Zachary Willis' NPI number is 1265847016. It was assigned on June 30, 2014, and it is active in the NPI Registry.
What kind of doctor is Dr. Zachary Willis?
Dr. Zachary Willis is a general surgeon in Maryville, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Zachary Willis practice?
Dr. Willis practices at 6800 State Route 162, Maryville, IL 62062. Dr. Willis' primary practice is Anderson Hospital in Maryville, Illinois, part of Anderson Healthcare. Dmand AI also links Dr. Willis to 2 group practices and clinics and 2 medical groups.
What is Dr. Zachary Willis' office phone number?
The practice phone on file for Dr. Willis is (618) 288-5711.
What is Dr. Zachary Willis' medical license number?
Dr. Willis holds Missouri license 2014017955.
Which hospitals is Dr. Zachary Willis affiliated with?
Dr. Willis practices at Anderson Hospital in Maryville, Illinois.
Does Dr. Zachary Willis accept Medicare?
Yes. CMS data shows Dr. Willis billed Medicare for 24 services in 2020.
What services does Dr. Zachary Willis bill to Medicare?
In 2020, Dr. Willis' most billed Medicare services were hospital inpatient care (99232).
What drugs does Dr. Zachary Willis prescribe most?
In 2019 Medicare Part D data, Dr. Willis' most prescribed drugs by claims were Azithromycin, Naproxen and Prednisone.
Has Dr. Zachary Willis received payments from drug or device companies?
CMS Open Payments shows $2,053 in general payments to Dr. Willis from 15 companies from 2016 to 2025. The largest total came from Sientra, Inc.
How long has Dr. Zachary Willis been practicing?
Dr. Willis' NPI was assigned in 2014.
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