NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1558353920 MD
Verify on CMS → Cynthia Horton, MD
Family Medicine Physician in Waimea, Hawaii.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 150,125 in Family Medicine Physician, 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 · 245 beneficiaries · Family Medicine Physician avg: 4K
Generic prescribing
86%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
61.1/100
▼ 22 pts below national avg 83.5 · Mid-tier
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Cynthia Horton, MD reported a CMS MIPS final score of 61.1/100 - below the 83.5 national average - and filed 2,885 Medicare Part D claims in 2024.
- 61.1/100
- MIPS score · -22 vs avg
- 3K
- Part D claims, 2024
- 86%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Federal trust snapshot
What official records show about Cynthia Horton, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1558353920), first enumerated 08/22/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 2,885 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 61.1/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1558353920 · Family Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · MIPS-LOW · RX-MID · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1558353920
- ENUM-LEGACY 2005
- TAX-MEGA 150K Family Medicine
- MIPS-LOW 61.1/100
- RX-MID 2,885
- BOOK-LIGHT 701 in Hawaii
- PHOTO-FINISH Graham Chelius · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Horton · this pr…
Horton · this provider
61.1 MIPS pts
- Teresa Lanier · …
Teresa Lanier
61.1 MIPS pts
- Graham Chelius ·…
Graham Chelius
61.1 MIPS pts
- Chad Crim · near
Chad Crim
61.1 MIPS pts
- John Henwood · n…
John Henwood
61.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Cynthia Horton, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
61 ≥ 6th percentile 6% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured 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.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Cynthia Horton, MD sits
This provider among family medicine physician peers
Across the 21,266 family medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, Cynthia Horton, MD writes more Part D claims than 53% of them and scores higher on MIPS quality than 7% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one family medicine physician peer from a representative sample of 60; the gold marker is Cynthia Horton, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Cynthia Horton, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Cynthia Horton, MD?
Below national averagePrimary specialty
Family Medicine Physician
Medicare Part D claims
2,885 18% vs specialty avg
MIPS final score
61.1/100 22.4 pts vs avg
Specialty distribution in Hawaii
How Family Medicine Physician compares to other specialties among Hawaii providers
Medicare quality performance, MIPS
Cynthia Horton, MD's 2023 MIPS final score plotted against the Family Medicine Physician national average
- MIPS Final Score
- 61.1/100
- vs 83.5 national avg · 2023 performance year
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).
Practice Address
Provider Details
| NPI | 1558353920 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 08/22/2005 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
61.0547
Final Score
Measured-score avg: 83.5
29.1903
Quality
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Cynthia Horton, MD 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.
Kauai Veterans Memorial Hospital
Waimea, HI
Critical Access Hospitals
CMS CCN: 121300
Samuel Mahelona Memorial Hospital
Kalaheo, HI
Critical Access Hospitals
CMS CCN: 121306
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Brand vs generic prescribing mix · Typical
Cynthia Horton, MD - brand share 13.0%
Family Medicine Physician average
13% brand-name claims vs 86% generic, on 2,885 2024 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 2024.
2,885
Total Claims
$303K
Total Drug Cost
245
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 5,212.967
- Total Day Supply
- 147,756
- Brand vs Generic
- 13% brand / 86% generic
- Brand Drug Cost
- $243K
- Generic Drug Cost
- $58K
- Opioid Claims
- 87 (3.0% rate)
- Antibiotic Claims
- 68
Patient Demographics
- Average Patient Age
- 72.9 years
- Avg HCC Risk Score
- 1.22
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 20, 65-74: 127, 75-84: 74, 85+: 24
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Cynthia Horton, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Levothyroxine Sodium
Levothyroxine Sodium
114 claims
- Losartan Potassium
Losartan Potassium
101 claims
- Lisinopril
Lisinopril
87 claims
- Gabapentin
Gabapentin
85 claims
- Simvastatin
Simvastatin
76 claims
- Buprenorphine-Nalo…
Buprenorphine-Naloxone
74 claims
- Metoprolol Succinate
Metoprolol Succinate
69 claims
- Atorvastatin Calcium
Atorvastatin Calcium
63 claims
| Drug | Claims |
|---|---|
| Levothyroxine Sodium | 114 |
| Losartan Potassium | 101 |
| Lisinopril | 87 |
| Gabapentin | 85 |
| Simvastatin | 76 |
| Buprenorphine-Naloxone Buprenorphine Hcl/Naloxone Hcl | 74 |
| Metoprolol Succinate | 69 |
| Atorvastatin Calcium | 63 |
| Amlodipine Besylate | 56 |
| Tamsulosin Hcl | 54 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Cynthia Horton, MD fits within the Family Medicine Physician landscape nationally.
150,125
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,519
Avg Claims per Provider
Cynthia Horton, MD's 2,885 claims are below the specialty average of 3,519.
Nationwide Family Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Horton, both outside Hawaii so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (61.1 here).
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Family Medicine Physician Providers in Hawaii
Other clinicians with the same primary specialty enrolled in Hawaii, drawn from the same CMS NPPES roster as Horton.
One of 701 Family Medicine Physician providers enrolled in Hawaii, 5 are shown here.
Dr. Jenifer Aaronson
M.D.
Kamuela, HI
Dr. Sharita Abbott
M.D.
Lahaina, HI
Dr. David Abelson
MD
Kahului, HI
Dr. Alex Aberin
MD
Papaikou, HI
Dr. Danielle Dawn Acacio
MD
Jbphh, HI
Compare Family Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Cynthia Horton, MD's specialty? ▼
Cynthia Horton, MD specializes in Family Medicine Physician and practices in Waimea, Hawaii. Credentials: MD.
How much does Cynthia Horton, MD prescribe under Medicare Part D? ▼
In 2024, Cynthia Horton, MD wrote 2,885 Medicare Part D claims totaling $303K in drug costs for 245 beneficiaries.
What is Cynthia Horton, MD's Medicare quality score? ▼
Cynthia Horton, MD has a CMS MIPS Final Score of 61.1/100 (Quality: 29.2). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Cynthia Horton, MD located? ▼
Cynthia Horton, MD is located at 4346 WAIMEA CANYON DRIVE, Waimea, HI, 96796. Phone: (808) 338-9431.
What is Cynthia Horton, MD's NPI number? ▼
Cynthia Horton, MD's National Provider Identifier (NPI) is 1558353920, issued on 08/22/2005.
Does Cynthia Horton, MD prescribe more brand-name or generic drugs? ▼
Cynthia Horton, MD's prescribing is 13% brand-name and 86% generic drugs by claim count, with $243K in brand drug costs.
Does Cynthia Horton, MD prescribe opioids? ▼
Yes, Cynthia Horton, MD had 87 opioid claims in 2024 with an opioid prescribing rate of 3.0%.
How many Family Medicine Physician providers are there in the US? ▼
There are 150,125 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,519 Medicare Part D claims per year.
What drugs does Cynthia Horton, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Cynthia Horton, MD's most frequently prescribed drugs include Levothyroxine Sodium, Losartan Potassium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Cynthia Horton, MD accept Medicare? ▼
Cynthia Horton, MD appears in CMS Medicare data with 2,885 Part D claims and 245 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Cynthia Horton, MD's credentials? ▼
Cynthia Horton, MD's NPI is 1558353920 with credentials MD. 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 (2024). 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 August 2026 (NPPES) / 2024 (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
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 August 2026.