NPPES file of Aug 9, 2026

Katrina Lynn Grosswiler, APRN

Nurse Practitioner · Fleming Island, FL

Katrina Lynn Grosswiler, APRN is a nurse practitioner with a practice address in Fleming Island, Florida, and NPI 1861269193, issued on Dec 6, 2023. Check the license (Florida APRN11030046, as entered in NPPES) on the Florida health license search; 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
1861269193
Name
Katrina Lynn Grosswiler
Credential
APRN
Primary taxonomy
Nurse Practitioner 363L00000X
License number
APRN11030046 FL
Self-reported in NPPES; status is on the state search
Practice location
4565 US Highway 17 Ste 200, Fleming Island, FL 32003
Phone
(904) 634-0640
Enumerated
Dec 6, 2023
Record last updated
Jul 28, 2025
Fax
(904) 634-0203
Medicaid ID
121742800 FL
Medicare enrollment
Enrolled (PECOS I20240318000728); 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 8,844 in Florida → Look up another NPI →

Also registered at 4565 US Highway 17 Ste 200

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

  1. Aaron Bates, M.D.Sports Medicine (Orthopaedic Surgery) Physician1417939679
  2. Morgan Brett, PA-CPhysician Assistant1699328856
  3. James Causey, DPTPhysical Therapist1083861751
  4. Joseph Frustaci, DPTPhysical Therapist1750499109
  5. Laura GarciaPhysical Therapist1548958085
  6. Richard Keys, PTPhysical Therapist1760528269

Verify Katrina Lynn Grosswiler in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersFlorida health license search
    Search for license APRN11030046    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
Open the Florida 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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85% fewer Medicare Part D claims than the average nurse practitioner in 2024

167 Medicare Part D claims for 126 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. 134 claims were for opioids.

  1. Katrina Grosswiler167
  2. Specialty average1,109

Most prescribed

  1. Oxycodone-Acetaminophen110 claims
  2. Tramadol Hcl18 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: $21.43

1 payment: food and beverage; the largest payer was Team 1, Llc. 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. Katrina Grosswiler$21.43
  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. Southeast Orthopedic Specialists LLCJacksonville, FL

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

Katrina Lynn Grosswiler among 8,844 nurse practitioner records in Florida

Katrina Lynn Grosswiler, APRN is one of 8,844 nurse practitioner records with a practice address in Florida. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 79% of them.

  • NPI issued2023 · 79% of these records are older, 16% newer
  • In a Medicare fileYes · 71% of these records are
  • In the CMS Doctors and Clinicians fileYes · 51% of these records are
  • Graduated2023 · median 2018 among the 4,492 with a school on file
  • Record last updated2025 · 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 Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

23 nurse practitioner records list a practice address in Fleming Island

They are 23 of the 571 NPPES records with a practice address in Fleming Island, and 8,844 nurse practitioner records in Florida.

All 8,844 in Florida → Every provider in Fleming Island → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Arlene Aquino, APRNFleming Island, FL 320031336617810
  2. Barbara Austin, APRNFleming Island, FL 320031396041547
  3. Jessika Blake, APRNFleming Island, FL 320031699357574
  4. Tiffany Connors, APRNFleming Island, FL 320031518445667
  5. Allison Courson, APRNFleming Island, FL 320031295285781
  6. Heather Gall, APRN, FNP-BC, MSNFleming Island, FL 320031851694269
  7. Brenda Garcia, APRNFleming Island, FL 320031073158747
  8. Amanda Hall, APRNFleming Island, FL 320031548771678

Common questions

What is Katrina Lynn Grosswiler, APRN's NPI number?

Katrina Lynn Grosswiler, APRN's National Provider Identifier (NPI) is 1861269193, issued on Dec 6, 2023. An NPI identifies a provider in billing; it is not a license.

Where is Katrina Lynn Grosswiler, APRN located?

The NPPES record lists a practice address at 4565 US Highway 17 Ste 200, Fleming Island, FL, 32003. Phone: (904) 634-0640. Providers update this record themselves, so call before visiting.

How can I verify Katrina Lynn Grosswiler, APRN's license?

NPPES lists Florida license number APRN11030046, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Katrina Lynn Grosswiler, APRN prescribe under Medicare Part D?

In 2024, Katrina Lynn Grosswiler, APRN had 167 Medicare Part D claims for 126 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.