NPI registry status
Active
2026 NPPES data Family Nurse Practitioner NPI 1295915825 NP
Verify on CMS → Barbara Bellfield, NP
Family Nurse Practitioner in Oxnard, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 210,832 in Family Nurse Practitioner, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
928
Medicare Part D claims · 236 beneficiaries · Family Nurse Practitioner avg: 1K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$4.1K
146 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Barbara Bellfield, NP filed 928 Medicare Part D claims in 2023 as a Family Nurse Practitioner in Oxnard, California, prescribing 87% generic.
- 928
- Part D claims, 2023
- 87%
- generic prescribing
- $4.1K
- industry payments (Sunshine Act)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Barbara Bellfield, NP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
928 Top 25% higher than 75% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Barbara Bellfield, NP?
Quality data not reportedPrimary specialty
Family Nurse Practitioner
Medicare Part D claims
928 24% vs specialty avg
Specialty distribution in California
How Family Nurse Practitioner compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Family Nurse Practitioner. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Barbara Bellfield, NP appears in the CMS NPPES registry as a Family Nurse Practitioner provider holding NP credentials at 1851 LOMBARD ST STE 105, Oxnard, CA, 93030, with a listed phone of (805) 485-7232. NPI 1295915825 was issued on 11/12/2007.
Medicare Part D records for calendar year 2023 show 928 prescription claims written by this provider, covering 236 Medicare beneficiaries and totaling roughly $827K in drug spend, split 13% brand-name and 87% generic by claim count.
Family Nurse Practitioner is a high-volume specialty nationwide, with 210,832 enrolled providers across 56 states and an average of 1,222 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1295915825 |
|---|---|
| Specialty | Family Nurse Practitioner |
| Credentials | NP |
| Gender | Female |
| NPI Issued | 11/12/2007 |
Hospital and facility affiliations
Facilities where Barbara Bellfield, NP bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Austin J MA MD A Professional Corporation
Oxnard, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Barbara Bellfield, NP. Source: openpaymentsdata.cms.gov.
Total received
$4.1K
Largest payer
Novartis Pharmaceuticals Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Barbara Bellfield, NP. To verify Barbara Bellfield, NP's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Barbara Bellfield, NP - brand share 13.0%
Family Nurse Practitioner average
13% brand-name claims vs 87% generic, on 928 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
928
Total Claims
$827K
Total Drug Cost
236
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,718
- Total Day Supply
- 46,791
- Brand vs Generic
- 13% brand / 87% generic
- Brand Drug Cost
- $771K
- Generic Drug Cost
- $56K
- Antibiotic Claims
- 26
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.73
- Gender Split
- 76% female / 24% male
- Age Distribution
- <65: 13, 65-74: 117, 75-84: 80, 85+: 26
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Barbara Bellfield, NP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Anastrozole
Anastrozole
262 claims
- Ondansetron Hcl 79
Ondansetron Hcl
79 claims
- Prochlorperazine M… 67
Prochlorperazine Maleate
67 claims
- Alendronate Sodium 49
Alendronate Sodium
49 claims
- Exemestane 46
Exemestane
46 claims
- Eliquis 41
Eliquis
41 claims
- Hydroxyurea 39
Hydroxyurea
39 claims
- Tamoxifen Citrate 38
Tamoxifen Citrate
38 claims
| Drug | Claims |
|---|---|
| Anastrozole | 262 |
| Ondansetron Hcl | 79 |
| Prochlorperazine Maleate | 67 |
| Alendronate Sodium | 49 |
| Exemestane | 46 |
| Eliquis Apixaban | 41 |
| Hydroxyurea | 39 |
| Tamoxifen Citrate | 38 |
| Xarelto Rivaroxaban | 34 |
| Prednisone | 30 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Nurse Practitioner Overview
How Barbara Bellfield, NP fits within the Family Nurse Practitioner landscape nationally.
210,832
Family Nurse Practitioner Providers in US
56
States with Family Nurse Practitioner
1,222
Avg Claims per Provider
Barbara Bellfield, NP's 928 claims are below the specialty average of 1,222.
Nearby Family Nurse Practitioner Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Bellfield.
Dr. Danielle Aaroe
FAMILY NURSE PRACTIT
Oroville, CA
Joshua Aaron
Mission Hills, CA
Dr. Orly Aaron
NP
San Francisco, CA
Paris Gilbert Russ Aaron
Sacramento, CA
Dr. Alvin Joseph Abad
FNP-C
San Francisco, CA
Compare Family Nurse Practitioner nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Family Nurse Practitioner peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore California
Frequently Asked Questions
What is Barbara Bellfield, NP's specialty? ▼
Barbara Bellfield, NP specializes in Family Nurse Practitioner and practices in Oxnard, California. Credentials: NP.
How much does Barbara Bellfield, NP prescribe under Medicare Part D? ▼
In 2023, Barbara Bellfield, NP wrote 928 Medicare Part D claims totaling $827K in drug costs for 236 beneficiaries.
Where is Barbara Bellfield, NP located? ▼
Barbara Bellfield, NP is located at 1851 LOMBARD ST STE 105, Oxnard, CA, 93030. Phone: (805) 485-7232.
What is Barbara Bellfield, NP's NPI number? ▼
Barbara Bellfield, NP's National Provider Identifier (NPI) is 1295915825, issued on 11/12/2007.
Does Barbara Bellfield, NP prescribe more brand-name or generic drugs? ▼
Barbara Bellfield, NP's prescribing is 13% brand-name and 87% generic drugs by claim count, with $771K in brand drug costs.
How many Family Nurse Practitioner providers are there in the US? ▼
There are 210,832 Family Nurse Practitioner providers across 56 states in the US. The average Family Nurse Practitioner provider writes 1,222 Medicare Part D claims per year.
What drugs does Barbara Bellfield, NP prescribe most often? ▼
Based on 2023 Medicare Part D data, Barbara Bellfield, NP's most frequently prescribed drugs include Anastrozole, Ondansetron Hcl, Prochlorperazine Maleate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Barbara Bellfield, NP accept Medicare? ▼
Barbara Bellfield, NP appears in CMS Medicare data with 928 Part D claims and 236 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Barbara Bellfield, NP's credentials? ▼
Barbara Bellfield, NP's NPI is 1295915825 with credentials NP. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.