Freddie J. Mertzig, APNP
Gerontology Nurse Practitioner · Milwaukee, WI
Freddie J. Mertzig, APNP is a gerontology nurse practitioner with a practice address in Milwaukee, Wisconsin, and NPI 1922523836, issued on Aug 11, 2017. Check the license (Wisconsin 7889-33, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Freddie J. Mertzig
- Credential
- APNP
- Primary taxonomy
- Gerontology Nurse Practitioner 363LG0600X
- License number
- 7889-33 WI
Self-reported in NPPES; status is on the state search - Practice location
- 3237 S 16TH St, Milwaukee, WI 53215
- Phone
- (262) 647-5000
- Enumerated
- Aug 11, 2017
- Record last updated
- Sep 25, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20171101002854); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gerontology nurse practitioner records → All 146 in Wisconsin → Look up another NPI →
Also registered at 3237 S 16TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Freddie J. Mertzig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
Search for license 7889-33Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.3 times the Medicare Part D claims of the average gerontology nurse practitioner in 2024
4,562 Medicare Part D claims for 1,238 beneficiaries, against an average of 1,369 among the 6,165 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 113 claims were for opioids.
Most prescribed
- Atorvastatin Calcium277 claims
- Losartan Potassium217 claims
- Prednisone185 claims
- Amlodipine Besylate162 claims
- Levothyroxine Sodium155 claims
- Omeprazole137 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $14.05
1 payment: food and beverage; the largest payer was Abbvie Inc. The 3,903 providers of this specialty with any payment received $742.05 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sheboygan Physicians Group S.C.Sheboygan, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Freddie J. Mertzig among 146 gerontology nurse practitioner records in Wisconsin
Freddie J. Mertzig, APNP is one of 146 gerontology nurse practitioner records with a practice address in Wisconsin. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 49% of them.
- NPI issued2017 · 49% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated2017 · median 2021 among the 80 with a school on file
- Record last updated2017 · 39% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LG0600X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gerontology Nurse Practitioner providers in Wisconsin
There are 146 gerontology nurse practitioner records in Wisconsin.
All 146 in Wisconsin → Every provider in Milwaukee → Gerontology Nurse Practitioner nationwide →
The 8 gerontology nurse practitioner records with the nearest ZIP codes
- Gail Harvancik, GNPMilwaukee, WI 532161245320571
- Lyah Holmes, N.P.Milwaukee, WI 532121649668559
- Barbara Berte, NPMilwaukee, WI 532111538279666
- Laura Grover, APNPMilwaukee, WI 532111871999003
- Shelley ForbusGreenfield, WI 532201962356980
- Nancy McClellan, GNPGreenfield, WI 532201598761389
- Brooke Shaikh, APNPMilwaukee, WI 532101952703944
- Sarah Shahwan, APNPMilwaukee, WI 532211033064522
Common questions
What is Freddie J. Mertzig, APNP's NPI number?
Freddie J. Mertzig, APNP's National Provider Identifier (NPI) is 1922523836, issued on Aug 11, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Freddie J. Mertzig, APNP located?
The NPPES record lists a practice address at 3237 S 16TH St, Milwaukee, WI, 53215. Phone: (262) 647-5000. Providers update this record themselves, so call before visiting.
How can I verify Freddie J. Mertzig, APNP's license?
NPPES lists Wisconsin license number 7889-33, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.
How much does Freddie J. Mertzig, APNP prescribe under Medicare Part D?
In 2024, Freddie J. Mertzig, APNP had 4,562 Medicare Part D claims for 1,238 beneficiaries; the average among gerontology nurse practitioner prescribers was 1,369. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.