Melissa Sixbey, FNP-C
NPI 1811602568 · Nurse Practitioner · Oxnard, CA
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Melissa Sixbey, FNP-C is a Nurse Practitioner provider in Oxnard, CA (NPI 1811602568).
Provider details
- NPI number
- 1811602568
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- FNP-C
- Sex
- Female
- Sole proprietor
- Yes
- License
- 95023881 (CA)
Specialties & taxonomies
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
3 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
140 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 93 | $147 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 47 | $102 |
Typical Medicare-allowed amounts for these services range $102–$147 (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 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 29 | 26 |
| Cefuroxime Axetilbrand: Cefuroxime | 29 | 27 |
| Cephalexin | 27 | 26 |
| Azithromycin | 22 | 21 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 13 | — |
| Atorvastatin Calcium | 12 | — |
| Sulfamethoxazole/Trimethoprim |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$150 across 7 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
- 2023-01-17
- Last updated
- 2023-01-17
- Certified
- 2023-01-17
Frequently asked questions
- What is Melissa Sixbey's NPI number?
- Melissa Sixbey's National Provider Identifier (NPI) is 1811602568, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Melissa Sixbey's specialty?
- Melissa Sixbey is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Melissa Sixbey located?
- Melissa Sixbey's practice location on file with NPPES is 1600 N Rose Ave, Oxnard, CA 93030-3722.
- What is Melissa Sixbey's phone number?
- The practice phone number listed in the NPPES registry for Melissa Sixbey is (805) 320-4402.
- Does Melissa Sixbey accept Medicare?
- Melissa Sixbey is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Melissa Sixbey's NPI active?
- Yes — Melissa Sixbey's NPI (1811602568) is active in the NPPES registry as of the last update on 2023-01-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.