Dr. Dorene Kay Zerfas, MD
- Medicare services, 2024
- 112
- Medicare patients, 2024
- 69
- Part D claims, 2024
- 54
- Hospital affiliations
- 4
- Industry payments
- $12,808
- Practice address
- 400 W River Woods Pkwy, Milwaukee, WI 53212
- Practice phone
- Call (414) 465-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ascension Medical Group
Multi-specialty group site · Milwaukee, Wisconsin
Find Dr. Zerfas' 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. Dorene Kay Zerfas is a general surgeon in Milwaukee, Wisconsin
Dr. Zerfas practices at Ascension Medical Group in Milwaukee, Wisconsin.
Dr. Zerfas' NPI, 1427299973, was assigned on March 12, 2009. Dr. Zerfas holds Indiana license 01076316A.
- NPI
- 1427299973NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1759519549
- NPI enumeration date
- March 12, 2009
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (414) 465-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dorene Kay Zerfas practices at Ascension Medical Group in Milwaukee, Wisconsin
Dr. Zerfas' primary practice is Ascension Medical Group, at 400 W River Woods Pkwy, Milwaukee, WI 53212. The practice phone is (414) 465-3000.
- Ascension Medical Group400 W River Woods Pkwy, Milwaukee, WI 53212Phone(414) 465-3000
Source: Dmand AI Affiliation Data
Dr. Dorene Kay Zerfas is affiliated with 6 sites of care and 4 medical groups
Dr. Zerfas' primary practice is Ascension Medical Group in Milwaukee, Wisconsin. Dr. Zerfas is also affiliated with Ascension SE Wisconsin Hospital - St. Joseph. The medical group on file is Ascension Medical Group. Dmand AI also links Dr. Zerfas to 3 more hospitals, 3 medical groups and 1 group practice or clinic, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Dorene Kay Zerfas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zerfas practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Medical Group | Available with a free account |
| +5 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dorene Kay Zerfas is one of 565 general surgeons in Wisconsin
Surgery is Dr. Zerfas' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Zerfas' licenses on file in 2 states: Indiana and New York.
Specialties and state licenses
- Surgery, IndianaPrimary
- New York license
General surgeons near Dr. Zerfas
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. Dorene Kay Zerfas billed Medicare for 112 services in 2024
CMS data shows 112 Medicare services from Dr. Zerfas across 6 procedure codes in 2024, for 69 Medicare patients. Medicare paid $7,022 for them.
Dr. Zerfas' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1582024: 11229%
Where Dr. Zerfas' Medicare services took place, 2024
- In an office3128%
- In a facility8172%
Dr. Zerfas compared with the Wisconsin median for general surgeons, 2024
- Dr. Zerfas
- Wisconsin median
- Medicare services
- 112vs 9913% above
- Medicare patients
- 69vs 10031% below
- Part D claims
- 12vs 3768% below
Medians across 557 general surgeons in Wisconsin with Dmand AI profiles that report each measure.
Dr. Zerfas' 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.
Need commercial claims for Dr. Zerfas?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zerfas and other general surgeons in Wisconsin.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Dorene Kay Zerfas treated 69 Medicare patients in 2024, average age 72
CMS counts 69 Medicare patients who saw Dr. Zerfas in 2024. The largest group is 65 to 74, with 27 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 1.86, 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. Zerfas' median patient age at 57, with 51% women.
Dr. Zerfas' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Zerfas' Medicare patients by sex, 2024
- Women2638%
- Men4362%
Chronic conditions among Dr. Zerfas' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis43%
- Chronic kidney disease33%
- Ischemic heart disease33%
- Diabetes32%
- Anxiety29%
- Heart failure28%
Share of Medicare patients with each condition. A patient can have several.
Dr. Zerfas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 57
Patient panel by sex, all payers
- Women51%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Dorene Kay Zerfas wrote 54 Medicare Part D claims in 2024
In 2024, Dr. Zerfas wrote 54 Medicare Part D claims for 30 patients. 100% of them were for generic drugs. CMS names the drug for 12 of them, across 1 drug with 11 or more claims each, at $52 in total drug cost. In 2018, CMS named 15 claims across 1 drug.
Dr. Zerfas' 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. Zerfas' Part D claims, 2024
- Opioids28%15 of 54 claims
- Antibiotics46%25 of 54 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, 2018 to 2024
- 2018
- 2024
- Claims for drugs CMS names
- 2018: 152024: 1220%
Drugs named by CMS: 1 in 2024, 1 in 2018.
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. Dorene Kay Zerfas takes part in Medicare
Dr. Zerfas accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Removal or shaving of skin growth: 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. Dorene Kay Zerfas received $12,808 in industry payments from 2016 to 2025
CMS Open Payments shows 44 general payments to Dr. Zerfas from 6 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 48% of the total. Intuitive Surgical, Inc. paid the most, $10,673.
General payments to Dr. Zerfas by program year, 2016 to 2025
General payments to Dr. Zerfas by kind, 2016 to 2025
- Travel and lodging$6,09748%
- Education$6,00047%
- Food and beverage$7106%
Companies that paid Dr. Zerfas 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. Dorene Kay Zerfas'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 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) |
| 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. Dorene Kay Zerfas
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. Dorene Kay Zerfas' NPI number?
Dr. Dorene Kay Zerfas' NPI number is 1427299973. It was assigned on March 12, 2009, and it is active in the NPI Registry.
What kind of doctor is Dr. Dorene Kay Zerfas?
Dr. Dorene Kay Zerfas is a general surgeon in Milwaukee, Wisconsin. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Dorene Kay Zerfas practice?
Dr. Zerfas practices at 400 W River Woods Pkwy, Milwaukee, WI 53212. Dr. Zerfas' primary practice is Ascension Medical Group in Milwaukee, Wisconsin. Dmand AI also links Dr. Zerfas to 3 hospitals, 3 medical groups and 1 group practice or clinic.
What is Dr. Dorene Kay Zerfas' office phone number?
The practice phone on file for Dr. Zerfas is (414) 465-3000.
What is Dr. Dorene Kay Zerfas' medical license number?
Dr. Zerfas holds Indiana license 01076316A, one of the licenses on file in 2 states.
Which states has Dr. Dorene Kay Zerfas been licensed in?
Dmand AI has state licenses on file for Dr. Zerfas in Indiana and New York.
Which hospitals is Dr. Dorene Kay Zerfas affiliated with?
Dr. Zerfas is affiliated with Ascension SE Wisconsin Hospital - St. Joseph. Dmand AI links Dr. Zerfas to 3 more hospitals.
What medical group is Dr. Dorene Kay Zerfas part of?
Dr. Zerfas is linked to Ascension Medical Group. Dmand AI links Dr. Zerfas to 3 more medical groups.
Does Dr. Dorene Kay Zerfas accept Medicare?
Yes. CMS data shows Dr. Zerfas billed Medicare for 112 services in 2024, and Dr. Zerfas accepts Medicare assignment.
How many Medicare patients does Dr. Dorene Kay Zerfas see?
CMS counts 69 Medicare patients who saw Dr. Zerfas in 2024, with an average age of 72.
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What services does Dr. Dorene Kay Zerfas bill to Medicare?
In 2024, Dr. Zerfas' most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99231) and office visit, established patient (99214).
What drugs does Dr. Dorene Kay Zerfas prescribe most?
In 2024 Medicare Part D data, Dr. Zerfas' most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Dorene Kay Zerfas received payments from drug or device companies?
CMS Open Payments shows $12,808 in general payments to Dr. Zerfas from 6 companies from 2016 to 2025. The largest total came from Intuitive Surgical, Inc.
How long has Dr. Dorene Kay Zerfas been practicing?
Dr. Zerfas graduated from medical school in 2008, 18 years ago.
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