Dr. Mark D. Zarnke, MD
- Medicare services, 2020
- 156
- Part D claims, 2020
- 30
- Industry payments
- $1,328
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 2350 N Rockton Ave, Rockford, IL 61103-3600
- Practice phone
- Call (815) 971-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave)
Multi-specialty group site · Rockford, Illinois
Find Dr. Zarnke'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. Mark D. Zarnke is a general surgeon in Rockford, Illinois
Dr. Zarnke practices at Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave) in Rockford, Illinois.
Dr. Zarnke's NPI, 1295737948, was assigned on August 12, 2005. Dr. Zarnke holds Illinois license 036078965.
- NPI
- 1295737948NPI Registry (opens in a new tab)
- NPI enumeration date
- August 12, 2005
- NPI status
- Active
- Practice phone
- (815) 971-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark D. Zarnke practices at 2 locations in Rockford, Illinois
Dr. Zarnke's primary practice is Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave), at 2350 N Rockton Ave, Rockford, IL 61103-3600. The practice phone is (815) 971-2000. The NPI Registry lists Dr. Zarnke's practice address as 2400 N Rockton Ave, Rockford, IL 61103.
- Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave)Primary2350 N Rockton Ave, Rockford, IL 61103-3600Phone(815) 971-2000
- NPI Registry address2400 N Rockton Ave, Rockford, IL 61103 · Winnebago CountyPhone(815) 963-3426
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Mark D. Zarnke is affiliated with 1 site of care and 1 medical group
Dr. Zarnke's primary practice is Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave) in Rockford, Illinois. The medical group on file is Mercyhealth Physicians.
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Mark D. Zarnke's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Zarnke practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave) | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mark D. Zarnke is one of 1,217 general surgeons in Illinois
Surgery is Dr. Zarnke's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Zarnke is licensed in Illinois.
Specialties and state licenses
- Surgery, IllinoisPrimary
General surgeons near Dr. Zarnke
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. Mark D. Zarnke billed Medicare for 156 services in 2020
CMS data shows 156 Medicare services from Dr. Zarnke across 5 procedure codes in 2020. Medicare paid $8,942 for them.
Dr. Zarnke's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Office and hospital visits
- 2019: 3502020: 15655%
- Tests and treatments
- 2019: 272020: 0100%
Where Dr. Zarnke's Medicare services took place, 2020
- In an office8856%
- In a facility6844%
Dr. Zarnke compared with the Illinois median for general surgeons, 2020
- Dr. Zarnke
- Illinois median
- Medicare services
- 156vs 19420% below
- Part D claims
- 30vs 287% above
Medians across 1,031 general surgeons in Illinois with Dmand AI profiles that report each measure.
Dr. Zarnke's 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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Zarnke and other general surgeons in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark D. Zarnke's patients have a median age of 76
Across all payers, Dmand AI patient panel data puts Dr. Zarnke's median patient age at 76, with 100% women.
Dr. Zarnke's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 76
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Mark D. Zarnke wrote 30 Medicare Part D claims in 2020
In 2020, Dr. Zarnke wrote 30 Medicare Part D claims. They cover 1 drug, with $296 in total drug cost. In 2019, CMS named 63 claims across 2 drugs.
Dr. Zarnke's most prescribed drugs by claims, 2020
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2019 to 2020
- 2019
- 2020
- Claims for drugs CMS names
- 2019: 632020: 3052%
Drugs named by CMS: 1 in 2020, 2 in 2019.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. Mark D. Zarnke received $1,328 in industry payments from 2016 to 2021
CMS Open Payments shows 48 general payments to Dr. Zarnke from 27 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 92% of the total. Merck Sharp & Dohme Corporation paid the most, $180.
General payments to Dr. Zarnke by program year, 2016 to 2021
General payments to Dr. Zarnke by kind, 2016 to 2021
- Food and beverage$1,22892%
- Consulting fees$1008%
Companies that paid Dr. Zarnke the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Mark D. Zarnke'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. Mark D. Zarnke
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. Mark D. Zarnke's NPI number?
Dr. Mark D. Zarnke's NPI number is 1295737948. It was assigned on August 12, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. Zarnke?
Dr. Mark D. Zarnke is a general surgeon in Rockford, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Mark D. Zarnke practice?
Dr. Zarnke practices at 2350 N Rockton Ave, Rockford, IL 61103-3600. Dr. Zarnke also practices at 2400 N Rockton Ave, Rockford, IL 61103. Dr. Zarnke's primary practice is Mercyhealth Physicians - Primary Care - Rockford (N Rockton Ave) in Rockford, Illinois.
What is Dr. Mark D. Zarnke's office phone number?
The practice phone on file for Dr. Zarnke is (815) 971-2000.
What is Dr. Mark D. Zarnke's medical license number?
Dr. Zarnke holds Illinois license 036078965.
What medical group is Dr. Mark D. Zarnke part of?
Dr. Zarnke is linked to Mercyhealth Physicians.
Does Dr. Mark D. Zarnke accept Medicare?
Yes. CMS data shows Dr. Zarnke billed Medicare for 156 services in 2020.
What services does Dr. Mark D. Zarnke bill to Medicare?
In 2020, Dr. Zarnke's most billed Medicare services were office visit, established patient (99212), office visit, established patient (99213) and hospital inpatient care (99232).
What drugs does Dr. Mark D. Zarnke prescribe most?
In 2020 Medicare Part D data, Dr. Zarnke's most prescribed drugs by claims were Hydrocodone-Acetaminophen.
Has Dr. Mark D. Zarnke received payments from drug or device companies?
CMS Open Payments shows $1,328 in general payments to Dr. Zarnke from 27 companies from 2016 to 2021. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Mark D. Zarnke been practicing?
Dr. Zarnke's NPI was assigned in 2005.
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