NPPES file of Aug 9, 2026

Cassandra L. O'Brien, APRN

Nurse Practitioner · Winter Park, FL

Cassandra L. O'Brien, APRN is a nurse practitioner with a practice address in Winter Park, Florida, and NPI 1821597717, issued on Feb 6, 2018. Check the license (Florida APRN9363285, 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
1821597717
Name
Cassandra L. O'Brien
Credential
APRN
Primary taxonomy
Nurse Practitioner 363L00000X
License number
APRN9363285 FL
Self-reported in NPPES; status is on the state search
Practice location
1605 W Fairbanks Ave, Winter Park, FL 32789
Phone
(407) 845-8356
Enumerated
Feb 6, 2018
Record last updated
Jan 6, 2026
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). 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 1605 W Fairbanks Ave

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

  1. Marjorie Abanador, ARNPFamily Nurse Practitioner1396228342
  2. George Abreut, DOCardiovascular Disease Physician1013546407
  3. Eric Agnew, PA-CPhysician Assistant1407209604
  4. Luisa Alzate BenjumeaCritical Care Medicine Nurse Practitioner1477127157
  5. Hossam Alzu'Bi, MDCardiovascular Disease Physician1821403783
  6. Shirley Baehr, PA-CSurgical Physician Assistant1689624389

Verify Cassandra L. O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersFlorida health license search
    Search for license APRN9363285    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

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59% fewer Medicare Part D claims than the average nurse practitioner in 2024

451 Medicare Part D claims for 149 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 22% of claims.

  1. Cassandra O'Brien451
  2. Specialty average1,109

Most prescribed

  1. Eliquis41 claims
  2. Metoprolol Succinate37 claims
  3. Losartan Potassium29 claims
  4. Carvedilol26 claims
  5. Rosuvastatin Calcium21 claims
  6. Clopidogrel17 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: $1,085.69

30 payments; by number, the most common kind was food and beverage; the largest payer was Kestra Medical Technology Services, 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. Cassandra O'Brien$1,085.69
  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.

Cassandra L. O'Brien among 8,844 nurse practitioner records in Florida

Cassandra L. O'Brien, 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 2018, is newer than 48% of them.

  • NPI issued2018 · 48% of these records are older, 46% newer
  • In a Medicare fileYes · 71% of these records are
  • In the CMS Doctors and Clinicians fileNo · 51% of these records are
  • Record last updated2026 · 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).

45 nurse practitioner records list a practice address in Winter Park

They are 45 of the 3,401 NPPES records with a practice address in Winter Park, and 8,844 nurse practitioner records in Florida.

All 8,844 in Florida → Every provider in Winter Park → Nurse Practitioner nationwide →

The 8 nurse practitioner records with the nearest ZIP codes

  1. Sanford Boaz, ARNPWinter Park, FL 327891538247978
  2. Amma Bonsu, ARNPWinter Park, FL 327891952447161
  3. Amber Braithwaite, CNPWinter Park, FL 327891174807275
  4. Tonya Drew, ARNPWinter Park, FL 327891679722219
  5. Rachel Gainsford, ARNPWinter Park, FL 327891053663294
  6. Adrianne Gasper, NPWinter Park, FL 327891386965085
  7. Kerin Howe, ARNPWinter Park, FL 327891114298270
  8. Sharon Key, ARNPWinter Park, FL 327891205045507

Common questions

What is Cassandra L. O'Brien, APRN's NPI number?

Cassandra L. O'Brien, APRN's National Provider Identifier (NPI) is 1821597717, issued on Feb 6, 2018. An NPI identifies a provider in billing; it is not a license.

Where is Cassandra L. O'Brien, APRN located?

The NPPES record lists a practice address at 1605 W Fairbanks Ave, Winter Park, FL, 32789. Phone: (407) 845-8356. Providers update this record themselves, so call before visiting.

How can I verify Cassandra L. O'Brien, APRN's license?

NPPES lists Florida license number APRN9363285, 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 Cassandra L. O'Brien, APRN prescribe under Medicare Part D?

In 2024, Cassandra L. O'Brien, APRN had 451 Medicare Part D claims for 149 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.