Freddie J. Mertzig, APNP
- Medicare patients, 2024
- 340
- Part D claims, 2024
- 4,562
- Hospital affiliations
- 2
- Industry payments
- $46
- Medical groups
- 3
- Practice address
- 2920 Superior Ave, Sheboygan, WI 53081-1944
- Practice phone
- Call (920) 452-6000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Sheboygan Physicians Group, SC
Primary care practice · Sheboygan, Wisconsin
Find Freddie Mertzig'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.
Freddie J. Mertzig is a gerontology nurse practitioner in Sheboygan, Wisconsin
Freddie Mertzig practices at Sheboygan Physicians Group, SC in Sheboygan, Wisconsin.
Freddie Mertzig's NPI, 1922523836, was assigned on August 11, 2017. Freddie Mertzig holds Wisconsin license 7889-33.
- NPI
- 1922523836NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5294091583
- NPI enumeration date
- August 11, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (920) 452-6000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Freddie J. Mertzig practices at Sheboygan Physicians Group, SC in Sheboygan, Wisconsin
Freddie Mertzig's primary practice is Sheboygan Physicians Group, SC, at 2920 Superior Ave, Sheboygan, WI 53081-1944. The practice phone is (920) 452-6000.
- Sheboygan Physicians Group, SC2920 Superior Ave, Sheboygan, WI 53081-1944Phone(920) 452-6000
Source: Dmand AI Affiliation Data
Freddie J. Mertzig is affiliated with 3 sites of care and 3 medical groups
Freddie Mertzig's primary practice is Sheboygan Physicians Group, SC in Sheboygan, Wisconsin. Freddie Mertzig is also affiliated with HSHS St. Nicholas Hospital. The medical group on file is Sheboygan Internal Medicine Associates. Dmand AI also links Freddie Mertzig to 1 more hospital and 2 medical groups, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Freddie J. Mertzig's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Freddie Mertzig practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Sheboygan Physicians Group, SC | 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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Freddie J. Mertzig is one of 96 gerontology nurse practitioners in Wisconsin
Gerontology is Freddie Mertzig's primary specialty in the NPI Registry, under taxonomy code 363LG0600X. Freddie Mertzig is licensed in Wisconsin.
Specialties and state licenses
- Gerontology nurse practitioner, WisconsinPrimary
Gerontology nurse practitioners near Freddie Mertzig
Counts of gerontology nurse practitioners 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
Freddie J. Mertzig treated 340 Medicare patients in 2024, average age 76
CMS counts 340 Medicare patients who saw Freddie Mertzig in 2024. The largest group is 65 to 74, with 145 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 5% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Freddie Mertzig's median patient age at 73, with 51% women.
Freddie Mertzig's Medicare patients by age, 2024
Freddie Mertzig's Medicare patients by sex, 2024
- Women16749%
- Men17351%
Chronic conditions among Freddie Mertzig's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis39%
- Chronic kidney disease35%
- Ischemic heart disease31%
- Atrial fibrillation28%
- Diabetes28%
- Heart failure21%
Share of Medicare patients with each condition. A patient can have several.
Freddie Mertzig's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women51%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Freddie J. Mertzig wrote 4,562 Medicare Part D claims in 2024
In 2024, Freddie Mertzig wrote 4,562 Medicare Part D claims for 1,238 patients. 91% of them were for generic drugs.
Freddie Mertzig's Part D claims by kind of drug, 2024
- Generic4,151 claims91%
- Brand-name380 claims8%
- Other31 claims1%
Drug classes CMS tracks in Freddie Mertzig's Part D claims, 2024
- Opioids2%113 of 4,562 claims
- Antibiotics6%251 of 4,562 claims
- Antipsychotics, patients 65 and over0%15 of 4,562 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Freddie J. Mertzig takes part in Medicare
Freddie Mertzig 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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Freddie J. Mertzig received $46 in industry payments in 2025
CMS Open Payments shows 2 general payments to Freddie Mertzig from 2 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Abbvie Inc. paid the most, $26.
Companies that paid Freddie Mertzig the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Freddie J. Mertzig'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 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 (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) |
| 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 Freddie J. Mertzig
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Freddie J. Mertzig's NPI number?
Freddie J. Mertzig's NPI number is 1922523836. It was assigned on August 11, 2017, and it is active in the NPI Registry.
What does Freddie J. Mertzig specialize in?
Freddie J. Mertzig is a gerontology nurse practitioner in Sheboygan, Wisconsin. The primary specialty in the NPI Registry is Gerontology Nurse Practitioner (taxonomy code 363LG0600X).
Where does Freddie J. Mertzig practice?
Freddie Mertzig practices at 2920 Superior Ave, Sheboygan, WI 53081-1944. Freddie Mertzig's primary practice is Sheboygan Physicians Group, SC in Sheboygan, Wisconsin. Dmand AI also links Freddie Mertzig to 1 hospital and 2 medical groups.
What is Freddie J. Mertzig's office phone number?
The practice phone on file for Freddie Mertzig is (920) 452-6000.
What is Freddie J. Mertzig's medical license number?
Freddie Mertzig holds Wisconsin license 7889-33.
Which hospitals is Freddie J. Mertzig affiliated with?
Freddie Mertzig is affiliated with HSHS St. Nicholas Hospital. Dmand AI links Freddie Mertzig to 1 more hospital.
What medical group is Freddie J. Mertzig part of?
Freddie Mertzig is linked to Sheboygan Internal Medicine Associates. Dmand AI links Freddie Mertzig to 2 more medical groups.
Does Freddie J. Mertzig accept Medicare?
Yes. CMS lists Freddie Mertzig as accepting Medicare assignment.
How many Medicare patients does Freddie J. Mertzig see?
CMS counts 340 Medicare patients who saw Freddie Mertzig in 2024, with an average age of 76.
Has Freddie J. Mertzig received payments from drug or device companies?
CMS Open Payments shows $46 in general payments to Freddie Mertzig from 2 companies from 2025 to 2025. The largest total came from Abbvie Inc.
How long has Freddie J. Mertzig been practicing?
Freddie Mertzig graduated from medical school in 2017, 9 years ago.
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