NPPES file of Aug 9, 2026

Tammy Rae Karls, NP

Nurse Practitioner · Fond Du Lac, WI

Tammy Rae Karls, NP is a nurse practitioner with a practice address in Fond Du Lac, Wisconsin, and NPI 1043933955, issued on Sep 26, 2022. Check the license (Wisconsin 13153-33, as entered in NPPES) with the Wisconsin board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1043933955
Name
Tammy Rae Karls
Credential
NP
Primary taxonomy
Nurse Practitioner 363L00000X
License number
13153-33 WI
Self-reported in NPPES; status is on the state search
Practice location
420 E Division St, Fond Du Lac, WI 54935
Phone
(920) 926-8495
Enumerated
Sep 26, 2022
Record last updated
Sep 26, 2022
Medicare enrollment
Enrolled (PECOS I20221025002376); accepts Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest nurse practitioner records → All 3,995 in Wisconsin → Look up another NPI →

Also registered at 420 E Division St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Elizabeth Berenz, FNP-BCFamily Nurse Practitioner1619386885
  2. Melissa Berggren, PA-CPhysician Assistant1639377617
  3. Louann Biddick, NPNurse Practitioner1770566721
  4. Jennifer Bissell, MDFamily Medicine Physician1316146962
  5. Tiffany Boelk, APNPNurse Practitioner1700459690
  6. David Bowman, M.D.Cardiovascular Disease Physician1962492397

Verify Tammy Rae Karls in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
    Search for license 13153-33    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Wisconsin license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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10% more Medicare Part D claims than the average nurse practitioner in 2024

1,219 Medicare Part D claims for 320 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D.

  1. Tammy Karls1,219
  2. Specialty average1,109

Most prescribed

  1. Tamsulosin Hcl408 claims
  2. Oxybutynin Chloride Er184 claims
  3. Finasteride161 claims
  4. Trimethoprim39 claims
  5. Ciprofloxacin Hcl38 claims
  6. Dutasteride35 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: $31.00

1 payment: compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program; the largest payer was Sumitomo Pharma America, Inc. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Tammy Karls$31.00
  2. Specialty average$791.64

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

  1. Ascension Medical Group-Fox Valley Wisconsin IncNeenah, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Tammy Rae Karls among 3,995 nurse practitioner records in Wisconsin

Tammy Rae Karls, NP is one of 3,995 nurse practitioner records with a practice address in Wisconsin. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 79% of them.

  • NPI issued2022 · 79% of these records are older, 15% newer
  • In a Medicare fileYes · 77% of these records are
  • In the CMS Doctors and Clinicians fileYes · 68% of these records are
  • Graduated2022 · median 2017 among the 2,701 with a school on file
  • Record last updated2022 · 41% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

60 nurse practitioner records list a practice address in Fond Du Lac

They are 60 of the 1,312 NPPES records with a practice address in Fond Du Lac, and 3,995 nurse practitioner records in Wisconsin.

All 3,995 in Wisconsin → Every provider in Fond Du Lac → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Louann Biddick, NPFond Du Lac, WI 549351770566721
  2. Monica Braun, NPFond Du Lac, WI 549351720339997
  3. Aleshia Cole, NPFond Du Lac, WI 549351417397126
  4. Kathleen Grochowski, APNPFond Du Lac, WI 549351568602530
  5. Sarah Guse, NPFond Du Lac, WI 549351417147786
  6. Barbara Guy, AP, NPFond Du Lac, WI 549351295817625
  7. Jessica Harding, NPFond Du Lac, WI 549351588951792
  8. Mary Kelm, NPFond Du Lac, WI 549351003802331

Common questions

What is Tammy Rae Karls, NP's NPI number?

Tammy Rae Karls, NP's National Provider Identifier (NPI) is 1043933955, issued on Sep 26, 2022. An NPI identifies a provider in billing; it is not a license.

Where is Tammy Rae Karls, NP located?

The NPPES record lists a practice address at 420 E Division St, Fond Du Lac, WI, 54935. Phone: (920) 926-8495. Providers update this record themselves, so call before visiting.

How can I verify Tammy Rae Karls, NP's license?

NPPES lists Wisconsin license number 13153-33, as entered by the provider. Search the Wisconsin board that licenses this profession; the NPPES record confirms identity only.

How much does Tammy Rae Karls, NP prescribe under Medicare Part D?

In 2024, Tammy Rae Karls, NP had 1,219 Medicare Part D claims for 320 beneficiaries; the average among nurse practitioner prescribers was 1,109. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.