NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1093856833 P.A.
Verify on CMS → Rebecca Grillo, P.A.
Medical Physician Assistant in North Haven, Connecticut.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 40,580 in Medical Physician Assistant, 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
3K
Medicare Part D claims · 254 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
86%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
94.2/100
▲ 11 pts above national avg 83.1 · Exceptional
Industry payments
$2.2K
111 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
Rebecca Grillo, P.A. reported a CMS MIPS final score of 94.2/100 - above the 83.1 national average - and filed 3,262 Medicare Part D claims in 2023.
- 94.2/100
- MIPS score · +11 vs avg
- 3K
- Part D claims, 2023
- 86%
- generic prescribing
- $2.2K
- 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.
Rebecca Grillo, P.A.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
94 Top 25% higher than 75% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Rebecca Grillo, P.A. sits
This provider among medical physician assistant peers
Across the 7,339 medical physician assistant providers who report both Medicare Part D prescribing and a MIPS quality score, Rebecca Grillo, P.A. writes more Part D claims than 92% of them and scores higher on MIPS quality than 74% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one medical physician assistant peer from a representative sample of 60; the gold marker is Rebecca Grillo, P.A.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Rebecca Grillo, P.A.?
High performer (top quartile)Primary specialty
Medical Physician Assistant
Medicare Part D claims
3,262 203% vs specialty avg
MIPS final score
94.2/100 11.1 pts vs avg
Specialty distribution in Connecticut
How Medical Physician Assistant compares to other specialties among Connecticut providers
Medicare quality performance, MIPS
Rebecca Grillo, P.A.'s 2023 MIPS final score plotted against the Medical Physician Assistant national average
- MIPS Final Score
- 94.2/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Medical Physician Assistant) - 94.2/100 vs national avg 83.1
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).
Rebecca Grillo, P.A. appears in the CMS NPPES registry as a Medical Physician Assistant provider holding P.A. credentials at 52 WASHINGTON AVE, North Haven, CT, 06473, with a listed phone of (203) 672-2800. NPI 1093856833 was issued on 02/12/2007.
Medicare Part D records for calendar year 2023 show 3,262 prescription claims written by this provider, covering 254 Medicare beneficiaries and totaling roughly $444K in drug spend, split 13% brand-name and 86% generic by claim count, with an opioid prescribing rate of 11.7%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 94.2/100 for the 2023 performance year (Quality 81.9), compared with the national average of 83.1.
Medical Physician Assistant is a mid-sized specialty nationwide, with 40,580 enrolled providers across 55 states and an average of 1,077 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 | 1093856833 |
|---|---|
| Specialty | Medical Physician Assistant |
| Credentials | P.A. |
| Gender | Female |
| NPI Issued | 02/12/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
94.1777
Final Score
Avg: 83.1
81.9442
Quality
99.3986
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Rebecca Grillo, P.A. 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.
Family Practice And Internal Medicine, LLC
Hamden, CT
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 Rebecca Grillo, P.A.. Source: openpaymentsdata.cms.gov.
Total received
$2.2K
Largest payer
AstraZeneca Pharmaceuticals LP
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.
Brand vs generic prescribing mix · Typical
Rebecca Grillo, P.A. - brand share 13.0%
Medical Physician Assistant average
13% brand-name claims vs 86% generic, on 3,262 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.
3,262
Total Claims
$444K
Total Drug Cost
254
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 5,623
- Total Day Supply
- 162,145
- Brand vs Generic
- 13% brand / 86% generic
- Brand Drug Cost
- $313K
- Generic Drug Cost
- $130K
- Opioid Claims
- 383 (11.7% rate)
- Antibiotic Claims
- 107
Patient Demographics
- Average Patient Age
- 69.8 years
- Avg HCC Risk Score
- 1.24
- Gender Split
- 68% female / 32% male
- Age Distribution
- <65: 54, 65-74: 123, 75-84: 56, 85+: 21
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Rebecca Grillo, P.A. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
167 claims
- Alprazolam
Alprazolam
137 claims
- Oxycodone Hcl
Oxycodone Hcl
135 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
134 claims
- Levothyroxine Sodium
Levothyroxine Sodium
108 claims
- Meloxicam
Meloxicam
84 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
84 claims
- Ozempic
Ozempic
81 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 167 |
| Alprazolam | 137 |
| Oxycodone Hcl | 135 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 134 |
| Levothyroxine Sodium | 108 |
| Meloxicam | 84 |
| Rosuvastatin Calcium | 84 |
| Ozempic Semaglutide | 81 |
| Gabapentin | 76 |
| Omeprazole | 75 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Rebecca Grillo, P.A. fits within the Medical Physician Assistant landscape nationally.
40,580
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider
Rebecca Grillo, P.A.'s 3,262 claims are above the specialty average of 1,077.
Nearby Medical Physician Assistant Providers in Connecticut
Other clinicians with the same primary specialty enrolled in Connecticut, drawn from the same CMS NPPES roster as Grillo.
Dr. Shiza Abbas
PA-C
Norwich, CT
Shalima Abdalla
Waterbury, CT
Dr. Samantha Abraham
PA-C
New Britain, CT
Dr. Elaine Accorsini
P.A.
Norwalk, CT
Dr. Allison Adajian
PA-C
Hartford, CT
Compare Medical Physician Assistant 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 Connecticut medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Medical Physician Assistant 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 Rebecca Grillo, P.A.'s specialty? ▼
Rebecca Grillo, P.A. specializes in Medical Physician Assistant and practices in North Haven, Connecticut. Credentials: P.A..
How much does Rebecca Grillo, P.A. prescribe under Medicare Part D? ▼
In 2023, Rebecca Grillo, P.A. wrote 3,262 Medicare Part D claims totaling $444K in drug costs for 254 beneficiaries.
What is Rebecca Grillo, P.A.'s Medicare quality score? ▼
Rebecca Grillo, P.A. has a CMS MIPS Final Score of 94.2/100 (Quality: 81.9). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Rebecca Grillo, P.A. located? ▼
Rebecca Grillo, P.A. is located at 52 WASHINGTON AVE, North Haven, CT, 06473. Phone: (203) 672-2800.
What is Rebecca Grillo, P.A.'s NPI number? ▼
Rebecca Grillo, P.A.'s National Provider Identifier (NPI) is 1093856833, issued on 02/12/2007.
Does Rebecca Grillo, P.A. prescribe more brand-name or generic drugs? ▼
Rebecca Grillo, P.A.'s prescribing is 13% brand-name and 86% generic drugs by claim count, with $313K in brand drug costs.
Does Rebecca Grillo, P.A. prescribe opioids? ▼
Yes, Rebecca Grillo, P.A. had 383 opioid claims in 2023 with an opioid prescribing rate of 11.7%.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,580 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does Rebecca Grillo, P.A. prescribe most often? ▼
Based on 2023 Medicare Part D data, Rebecca Grillo, P.A.'s most frequently prescribed drugs include Atorvastatin Calcium, Alprazolam, Oxycodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rebecca Grillo, P.A. accept Medicare? ▼
Rebecca Grillo, P.A. appears in CMS Medicare data with 3,262 Part D claims and 254 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rebecca Grillo, P.A.'s credentials? ▼
Rebecca Grillo, P.A.'s NPI is 1093856833 with credentials P.A.. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.