Cassandra O'Brien, APRN
NPI 1821597717 · Nurse Practitioner · Winter Park, FL
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cassandra O'Brien, APRN is a Nurse Practitioner provider in Winter Park, FL (NPI 1821597717).
Provider details
- NPI number
- 1821597717
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- APRN
- Sex
- Female
- Sole proprietor
- No
- License
- APRN9363285 (FL)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
8 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
19 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 19 | $106 |
Typical Medicare-allowed amounts for these services range $106–$106 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Apixabanbrand: Eliquis | 41 | 13 |
| Metoprolol Succinate | 37 | 16 |
| Losartan Potassium | 29 | 11 |
| Carvedilol | 26 | 12 |
| Rosuvastatin Calcium | 21 | — |
| Clopidogrel Bisulfatebrand: Clopidogrel | 17 | — |
| Amiodarone Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,086 across 30 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-02-06
- Last updated
- 2026-01-06
- Certified
- 2026-01-06
Frequently asked questions
- What is Cassandra O'Brien's NPI number?
- Cassandra O'Brien's National Provider Identifier (NPI) is 1821597717, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cassandra O'Brien's specialty?
- Cassandra O'Brien is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Cassandra O'Brien located?
- Cassandra O'Brien's practice location on file with NPPES is 1605 W Fairbanks Ave, Winter Park, FL 32789-4603.
- What is Cassandra O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Cassandra O'Brien is (407) 845-8356.
- Does Cassandra O'Brien accept Medicare?
- Cassandra O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cassandra O'Brien's NPI active?
- Yes — Cassandra O'Brien's NPI (1821597717) is active in the NPPES registry as of the last update on 2026-01-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.