NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Nurse Practitioner NPI 1003051954 N.P.
Verify on CMS → Maria Castillo, N.P.
Obstetrics & Gynecology Nurse Practitioner in Los Angeles, 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 2,867 in Obstetrics & Gynecology 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
853
Medicare Part D claims · 229 beneficiaries · Obstetrics & Gynecology Nurse Practitioner avg: 232
Generic prescribing
90%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$191.22
5 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
Maria Castillo, N.P. filed 853 Medicare Part D claims in 2023 as a Obstetrics & Gynecology Nurse Practitioner in Los Angeles, California, prescribing 90% generic.
- 853
- Part D claims, 2023
- 90%
- generic prescribing
- $191.22
- 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.
Maria Castillo, N.P.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
853 Top 27% higher than 73% 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 Maria Castillo, N.P.?
Quality data not reportedPrimary specialty
Obstetrics & Gynecology Nurse Practitioner
Medicare Part D claims
853 268% vs specialty avg
Specialty distribution in California
How Obstetrics & Gynecology 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 Obstetrics & Gynecology 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).
Maria Castillo, N.P. appears in the CMS NPPES registry as an Obstetrics & Gynecology Nurse Practitioner provider holding N.P. credentials at 3000 E 1ST ST, Los Angeles, CA, 90063, with a listed phone of (323) 262-6935. NPI 1003051954 was issued on 12/06/2008.
Medicare Part D records for calendar year 2023 show 853 prescription claims written by this provider, covering 229 Medicare beneficiaries and totaling roughly $74K in drug spend, split 9% brand-name and 90% generic by claim count.
Obstetrics & Gynecology Nurse Practitioner is a narrow specialty nationwide, with 2,867 enrolled providers across 52 states and an average of 232 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 | 1003051954 |
|---|---|
| Specialty | Obstetrics & Gynecology Nurse Practitioner |
| Credentials | N.P. |
| Gender | Female |
| NPI Issued | 12/06/2008 |
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 Maria Castillo, N.P.. Source: openpaymentsdata.cms.gov.
Total received
$191
Largest payer
Lilly USA, LLC
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 Maria Castillo, N.P.. To verify Maria Castillo, N.P.'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 · Generic-heavy
Maria Castillo, N.P. - brand share 9.0%
Obstetrics & Gynecology Nurse Practitioner average
9% brand-name claims vs 90% generic, on 853 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.
853
Total Claims
$74K
Total Drug Cost
229
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,520
- Total Day Supply
- 39,419
- Brand vs Generic
- 9% brand / 90% generic
- Brand Drug Cost
- $56K
- Generic Drug Cost
- $18K
- Antibiotic Claims
- 164
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 1.32
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 24, 65-74: 120, 75-84: 67, 85+: 18
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Maria Castillo, N.P. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ibuprofen
Ibuprofen
109 claims
- Ciprofloxacin Hcl
Ciprofloxacin Hcl
49 claims
- Cephalexin 42
Cephalexin
42 claims
- Metformin Hcl 41
Metformin Hcl
41 claims
- Azithromycin 27
Azithromycin
27 claims
- Lisinopril 27
Lisinopril
27 claims
- Amoxicillin 26
Amoxicillin
26 claims
- Atorvastatin Calcium 23
Atorvastatin Calcium
23 claims
| Drug | Claims |
|---|---|
| Ibuprofen | 109 |
| Ciprofloxacin Hcl | 49 |
| Cephalexin | 42 |
| Metformin Hcl | 41 |
| Azithromycin | 27 |
| Lisinopril | 27 |
| Amoxicillin | 26 |
| Atorvastatin Calcium | 23 |
| Omeprazole | 23 |
| Amlodipine Besylate | 19 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Obstetrics & Gynecology Nurse Practitioner in CA →
All providers in California →
Compare specialties →
Obstetrics & Gynecology Nurse Practitioner Overview
How Maria Castillo, N.P. fits within the Obstetrics & Gynecology Nurse Practitioner landscape nationally.
2,867
Obstetrics & Gynecology Nurse Practitioner Providers in US
52
States with Obstetrics & Gynecology Nurse Practitioner
232
Avg Claims per Provider
Maria Castillo, N.P.'s 853 claims are above the specialty average of 232.
Nearby Obstetrics & Gynecology Nurse Practitioner Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Castillo.
Dr. Nkeiruka Abanobi
NP
Redlands, CA
Dr. Eloisa Agatep
FNP
Palm Springs, CA
Dr. Maryam Alamoutinia
N.P.
Newport Beach, CA
Dr. Anaivis Alfonso Gonzalez
FNP
Fontana, CA
Dr. Catherine Allen
N.P.
San Jose, CA
Compare Obstetrics & Gynecology 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 Obstetrics & Gynecology 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.
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Frequently Asked Questions
What is Maria Castillo, N.P.'s specialty? ▼
Maria Castillo, N.P. specializes in Obstetrics & Gynecology Nurse Practitioner and practices in Los Angeles, California. Credentials: N.P..
How much does Maria Castillo, N.P. prescribe under Medicare Part D? ▼
In 2023, Maria Castillo, N.P. wrote 853 Medicare Part D claims totaling $74K in drug costs for 229 beneficiaries.
Where is Maria Castillo, N.P. located? ▼
Maria Castillo, N.P. is located at 3000 E 1ST ST, Los Angeles, CA, 90063. Phone: (323) 262-6935.
What is Maria Castillo, N.P.'s NPI number? ▼
Maria Castillo, N.P.'s National Provider Identifier (NPI) is 1003051954, issued on 12/06/2008.
Does Maria Castillo, N.P. prescribe more brand-name or generic drugs? ▼
Maria Castillo, N.P.'s prescribing is 9% brand-name and 90% generic drugs by claim count, with $56K in brand drug costs.
How many Obstetrics & Gynecology Nurse Practitioner providers are there in the US? ▼
There are 2,867 Obstetrics & Gynecology Nurse Practitioner providers across 52 states in the US. The average Obstetrics & Gynecology Nurse Practitioner provider writes 232 Medicare Part D claims per year.
What drugs does Maria Castillo, N.P. prescribe most often? ▼
Based on 2023 Medicare Part D data, Maria Castillo, N.P.'s most frequently prescribed drugs include Ibuprofen, Ciprofloxacin Hcl, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Maria Castillo, N.P. accept Medicare? ▼
Maria Castillo, N.P. appears in CMS Medicare data with 853 Part D claims and 229 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Maria Castillo, N.P.'s credentials? ▼
Maria Castillo, N.P.'s NPI is 1003051954 with credentials N.P.. 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.