NPI registry status
Active
2026 NPPES data Family Nurse Practitioner NPI 1902342603 FNP
Verify on CMS → Cassandra Amarillas, FNP
Family Nurse Practitioner in Tucson, Arizona.
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
189
Medicare Part D claims · 13 beneficiaries · Family Nurse Practitioner avg: 1K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Cassandra Amarillas, FNP filed 189 Medicare Part D claims in 2023 as a Family Nurse Practitioner in Tucson, Arizona, prescribing 81% generic.
- 189
- Part D claims, 2023
- 81%
- generic prescribing
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.
Cassandra Amarillas, FNP's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
189 35th percentile higher than 35% 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 Cassandra Amarillas, FNP?
Quality data not reportedPrimary specialty
Family Nurse Practitioner
Medicare Part D claims
189 85% vs specialty avg
Specialty distribution in Arizona
How Family Nurse Practitioner compares to other specialties among Arizona 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).
Cassandra Amarillas, FNP appears in the CMS NPPES registry as a Family Nurse Practitioner provider holding FNP credentials at 6950 E GOLF LINKS RD, Tucson, AZ, 85730, with a listed phone of (520) 309-2289. NPI 1902342603 was issued on 01/18/2017.
Medicare Part D records for calendar year 2023 show 189 prescription claims written by this provider, covering 13 Medicare beneficiaries and totaling roughly $14K in drug spend, split 19% brand-name and 81% 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 | 1902342603 |
|---|---|
| Specialty | Family Nurse Practitioner |
| Credentials | FNP |
| Gender | Female |
| NPI Issued | 01/18/2017 |
Brand vs generic prescribing mix · Typical
Cassandra Amarillas, FNP - brand share 19.0%
Family Nurse Practitioner average
19% brand-name claims vs 81% generic, on 189 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.
189
Total Claims
$14K
Total Drug Cost
13
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 263
- Total Day Supply
- 7,558
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $10K
- Generic Drug Cost
- $4K
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 0.98
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Cassandra Amarillas, FNP prescribes most
Top Medicare Part D drugs by claim count, 2023
- Montelukast Sodium
Montelukast Sodium
15 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
14 claims
- Testosterone Cypio…
Testosterone Cypionate
14 claims
- Carvedilol
Carvedilol
13 claims
- Celebrex
Celebrex
13 claims
- Clopidogrel
Clopidogrel
13 claims
- Metformin Hcl Er
Metformin Hcl Er
13 claims
- Ranolazine Er
Ranolazine Er
13 claims
| Drug | Claims |
|---|---|
| Montelukast Sodium | 15 |
| Rosuvastatin Calcium | 14 |
| Testosterone Cypionate | 14 |
| Carvedilol | 13 |
| Celebrex Celecoxib | 13 |
| Clopidogrel Clopidogrel Bisulfate | 13 |
| Metformin Hcl Er Metformin Hcl | 13 |
| Ranolazine Er Ranolazine | 13 |
| Valsartan | 13 |
| Risedronate Sodium Dr Risedronate Sodium | 12 |
* 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 Cassandra Amarillas, FNP 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
Cassandra Amarillas, FNP's 189 claims are below the specialty average of 1,222.
Nearby Family Nurse Practitioner Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Amarillas.
Dr. Sharla Abalos
NP
Tucson, AZ
Dr. Kristian Abarca
DNP, FNP
Willcox, AZ
Dr. Rosa Abarca
FNP-BC, FNP-C
Yuma, AZ
Dorothy Abbey
Phoenix, AZ
Dr. Lamia Abdouni
PMHNP
Chandler, AZ
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 Arizona 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
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Medical Specialties Explained
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Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Cassandra Amarillas, FNP's specialty? ▼
Cassandra Amarillas, FNP specializes in Family Nurse Practitioner and practices in Tucson, Arizona. Credentials: FNP.
How much does Cassandra Amarillas, FNP prescribe under Medicare Part D? ▼
In 2023, Cassandra Amarillas, FNP wrote 189 Medicare Part D claims totaling $14K in drug costs for 13 beneficiaries.
Where is Cassandra Amarillas, FNP located? ▼
Cassandra Amarillas, FNP is located at 6950 E GOLF LINKS RD, Tucson, AZ, 85730. Phone: (520) 309-2289.
What is Cassandra Amarillas, FNP's NPI number? ▼
Cassandra Amarillas, FNP's National Provider Identifier (NPI) is 1902342603, issued on 01/18/2017.
Does Cassandra Amarillas, FNP prescribe more brand-name or generic drugs? ▼
Cassandra Amarillas, FNP's prescribing is 19% brand-name and 81% generic drugs by claim count, with $10K 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 Cassandra Amarillas, FNP prescribe most often? ▼
Based on 2023 Medicare Part D data, Cassandra Amarillas, FNP's most frequently prescribed drugs include Montelukast Sodium, Rosuvastatin Calcium, Testosterone Cypionate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cassandra Amarillas, FNP accept Medicare? ▼
Cassandra Amarillas, FNP appears in CMS Medicare data with 189 Part D claims and 13 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cassandra Amarillas, FNP's credentials? ▼
Cassandra Amarillas, FNP's NPI is 1902342603 with credentials FNP. 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.