Melissa K. Sixbey, FNP-C
- Medicare services, 2024
- 140
- Medicare patients, 2024
- 138
- Part D claims, 2024
- 491
- MIPS score, 2024
- 97
- Hospital affiliations
- 2
- Practice address
- 1600 N Rose Ave, Oxnard, CA 93030
- Practice phone
- Call (805) 988-2500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Melissa Sixbey's professional email, personal email and mobile number
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Melissa K. Sixbey is a nurse practitioner in Oxnard, California
Melissa Sixbey practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health.
Melissa Sixbey's NPI, 1811602568, was assigned on January 17, 2023. Melissa Sixbey holds California license 95023881.
- NPI
- 1811602568NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7618324807
- NPI enumeration date
- January 17, 2023
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 988-2500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 30
- Medical school graduation
- 2022
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Melissa K. Sixbey practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California
Melissa Sixbey's primary practice is Dignity Health - St. John's Regional Medical Center, at 1600 N Rose Ave, Oxnard, CA 93030 in Ventura County. The practice phone is (805) 988-2500.
- Dignity Health - St. John's Regional Medical Center1600 N Rose Ave, Oxnard, CA 93030 · Ventura CountyPhone(805) 988-2500
Source: Dmand AI Affiliation Data
Melissa K. Sixbey is affiliated with 2 sites of care and 1 medical group
Melissa Sixbey's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. The medical group on file is Vituity. Dmand AI also links Melissa Sixbey to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Melissa K. Sixbey's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Melissa Sixbey practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - St. John's Regional Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Melissa K. Sixbey is one of 5,983 nurse practitioners in California
Nurse practitioner is Melissa Sixbey's primary specialty in the NPI Registry, under taxonomy code 363L00000X. Melissa Sixbey is licensed in California.
Specialties and state licenses
- Nurse practitioner, CaliforniaPrimary
Nurse practitioners near Melissa Sixbey
Counts of nurse practitioners with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Melissa K. Sixbey billed Medicare for 140 services in 2024
CMS data shows 140 Medicare services from Melissa Sixbey across 2 procedure codes in 2024, for 138 Medicare patients. Medicare paid $14,197 for them. Every service was in a facility, such as a hospital, rather than an office.
Melissa Sixbey compared with the California median for nurse practitioners, 2024
- Melissa Sixbey
- California median
- Medicare services
- 140vs 27950% below
- Medicare patients
- 138vs 9250% above
- Part D claims
- 166vs 36655% below
Medians across 3,047 nurse practitioners in California with Dmand AI profiles that report each measure.
Melissa Sixbey's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Melissa K. Sixbey treated 138 Medicare patients in 2024, average age 68
CMS counts 138 Medicare patients who saw Melissa Sixbey in 2024. The largest group is under 65, with 46 patients. 75% of them have high blood pressure, and 71% have high cholesterol. 59% are also on Medicaid. Their average risk score is 1.97, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Melissa Sixbey's median patient age at 31, with 58% women.
Melissa Sixbey's Medicare patients by age, 2024
Melissa Sixbey's Medicare patients by sex, 2024
- Women7957%
- Men5943%
Chronic conditions among Melissa Sixbey's Medicare patients, 2024
- High blood pressure75%
- High cholesterol71%
- Arthritis48%
- Diabetes46%
- Mood disorders41%
- Anxiety38%
- Depression36%
- Ischemic heart disease30%
Share of Medicare patients with each condition. A patient can have several.
Melissa Sixbey's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 31
Patient panel by sex, all payers
- Women58%
- Men41%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Melissa K. Sixbey wrote 491 Medicare Part D claims in 2024
In 2024, Melissa Sixbey wrote 491 Medicare Part D claims for 278 patients. 93% of them were for generic drugs. CMS names the drug for 166 of them, across 9 drugs with 11 or more claims each, at $1,179 in total drug cost.
Melissa Sixbey's Part D claims by kind of drug, 2024
- Generic457 claims93%
- Brand-name and other34 claims7%
Melissa Sixbey's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Melissa Sixbey's Part D claims, 2024
- Opioids4%21 of 491 claims
- Antibiotics34%168 of 491 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Melissa K. Sixbey scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Melissa Sixbey for performance year 2024, reported as part of a group. Melissa Sixbey accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Melissa Sixbey's MIPS scores, performance year 2024
- 97of 100Final score
- 90of 100Quality
- 40of 100Improvement Activities
- 78of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Melissa K. Sixbey received $347 in industry payments from 2024 to 2025
CMS Open Payments shows 16 general payments to Melissa Sixbey from 3 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $177.
General payments to Melissa Sixbey by program year, 2024 to 2025
Companies that paid Melissa Sixbey the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Melissa K. Sixbey's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Melissa K. Sixbey
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Melissa K. Sixbey's NPI number?
Melissa K. Sixbey's NPI number is 1811602568. It was assigned on January 17, 2023, and it is active in the NPI Registry.
What does Melissa K. Sixbey specialize in?
Melissa K. Sixbey is a nurse practitioner in Oxnard, California. The primary specialty in the NPI Registry is Nurse Practitioner (taxonomy code 363L00000X).
Where does Melissa K. Sixbey practice?
Melissa Sixbey practices at 1600 N Rose Ave, Oxnard, CA 93030. Melissa Sixbey's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. Dmand AI also links Melissa Sixbey to 1 hospital.
What is Melissa K. Sixbey's office phone number?
The practice phone on file for Melissa Sixbey is (805) 988-2500.
What is Melissa K. Sixbey's medical license number?
Melissa Sixbey holds California license 95023881.
Which hospitals is Melissa K. Sixbey affiliated with?
Melissa Sixbey practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California. Dmand AI links Melissa Sixbey to 1 more hospital.
What medical group is Melissa K. Sixbey part of?
Melissa Sixbey is linked to Vituity.
Does Melissa K. Sixbey accept Medicare?
Yes. CMS data shows Melissa Sixbey billed Medicare for 140 services in 2024, and Melissa Sixbey accepts Medicare assignment.
What is Melissa K. Sixbey's MIPS score?
Melissa Sixbey's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
How many Medicare patients does Melissa K. Sixbey see?
CMS counts 138 Medicare patients who saw Melissa Sixbey in 2024, with an average age of 68.
Show 4 more questionsShow fewer questions
What services does Melissa K. Sixbey bill to Medicare?
In 2024, Melissa Sixbey's most billed Medicare services were emergency department visit (99285) and emergency department visit (99284).
What drugs does Melissa K. Sixbey prescribe most?
In 2024 Medicare Part D data, Melissa Sixbey's most prescribed drugs by claims were Amoxicillin-Clavulanate Potass, Cefuroxime and Cephalexin.
Has Melissa K. Sixbey received payments from drug or device companies?
CMS Open Payments shows $347 in general payments to Melissa Sixbey from 3 companies from 2024 to 2025. The largest total came from Novo Nordisk Inc.
How long has Melissa K. Sixbey been practicing?
Melissa Sixbey graduated from medical school in 2022, 4 years ago.
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