NPI registry status
Active
2026 NPPES data Student in an Organized Health Care Education/Training Program NPI 1871851188 M.D.
Verify on CMS → Katrina Chin Loy, M.D.
Student in an Organized Health Care Education/Training Program in Washington, District of Columbia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 351,014 in Student in an Organized Health Care Education/Training Program, 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
1K
Medicare Part D claims · 217 beneficiaries · Student in an Organized Health Care Education/Training Program avg: 488
Generic prescribing
69%
generic claims · 31% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.1K
19 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Katrina Chin Loy, M.D. filed 1,026 Medicare Part D claims in 2024 as a Student in an Organized Health Care Education/Training Program in Washington, District of Columbia, prescribing 69% generic.
- 1K
- Part D claims, 2024
- 69%
- generic prescribing
- $1.1K
- industry payments (Sunshine Act)
- ≥75th
- pct by Part D claim volume (lower-bound band)
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 Katrina Chin Loy, M.D.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1871851188), first enumerated 04/25/2012.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,026 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$1.1K in reported industry payments (19 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- 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 1871851188 · Student in an Organized Health Care Education/Training Program
NPI-10 · ENUM-MID · TAX-MEGA · RX-MID · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1871851188
- ENUM-MID 2012
- TAX-MEGA 351K Student in
- RX-MID 1,026
- BOOK-LIGHT 2,974 in District of Columbia
- PHOTO-ENUM Elecia Kim · 2012
Katrina Chin Loy, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,026 ≥ 75th percentile 75% of 1,416,883 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
What does the federal data show about Katrina Chin Loy, M.D.?
Quality data not reportedPrimary specialty
Student in an Organized Health Care Education/Training Program
Medicare Part D claims
1,026 110% vs specialty avg
Specialty distribution in District of Columbia
How Student in an Organized Health Care Education/Training Program compares to other specialties among District of Columbia 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 Student in an Organized Health Care Education/Training Program. 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).
Practice Address
Provider Details
| NPI | 1871851188 |
|---|---|
| Specialty | Student in an Organized Health Care Education/Training Program |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 04/25/2012 |
Hospital and facility affiliations
Facilities where Katrina Chin Loy, M.D. 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.
Howard University
Washington, DC
Visionmd, LLC
Glenn Dale, MD
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 Katrina Chin Loy, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$1.1K
Largest payer
Glaukos 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.
Brand vs generic prescribing mix · Above average
Katrina Chin Loy, M.D. - brand share 31.0%
Student in an Organized Health Care Education/Training Program average
31% brand-name claims vs 69% generic, on 1,026 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.
1,026
Total Claims
$55K
Total Drug Cost
217
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,582.867
- Total Day Supply
- 44,518
- Brand vs Generic
- 31% brand / 69% generic
- Brand Drug Cost
- $41K
- Generic Drug Cost
- $14K
Patient Demographics
- Average Patient Age
- 71.9 years
- Avg HCC Risk Score
- 1.28
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 21, 65-74: 115, 75-84: 68, 85+: 13
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Katrina Chin Loy, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Latanoprost
Latanoprost
425 claims
- Prednisolone Acetate 134
Prednisolone Acetate
134 claims
- Dorzolamide-Timolol 93
Dorzolamide-Timolol
93 claims
- Azelastine Hcl 82
Azelastine Hcl
82 claims
- Timolol Maleate 46
Timolol Maleate
46 claims
- Brimonidine Tartrate 45
Brimonidine Tartrate
45 claims
- Cyclosporine 37
Cyclosporine
37 claims
- Neomycin-Polymyxin… 36
Neomycin-Polymyxin-Dexameth
36 claims
| Drug | Claims |
|---|---|
| Latanoprost | 425 |
| Prednisolone Acetate | 134 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 93 |
| Azelastine Hcl | 82 |
| Timolol Maleate | 46 |
| Brimonidine Tartrate | 45 |
| Cyclosporine | 37 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 36 |
| Ketorolac Tromethamine | 25 |
| Moxifloxacin Moxifloxacin Hcl | 23 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Student in an Organized Health Care Education/Training Program in DC →
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Student in an Organized Health Care Education/Training Program Overview
How Katrina Chin Loy, M.D. fits within the Student in an Organized Health Care Education/Training Program landscape nationally.
351,014
Student in an Organized Health Care Education/Training Program Providers in US
55
States with Student in an Organized Health Care Education/Training Program
488
Avg Claims per Provider
Katrina Chin Loy, M.D.'s 1,026 claims are above the specialty average of 488.
Nationwide Student in an Organized Health Care Education/Training Program peers with similar MIPS or enrollment year
Two federal-record peer sets for Chin Loy, both outside District of Columbia so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2012)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Student in an Organized Health Care Education/Training Program Providers in District of Columbia
Other clinicians with the same primary specialty enrolled in District of Columbia, drawn from the same CMS NPPES roster as Chin Loy.
One of 2,974 Student in an Organized Health Care Education/Training Program providers enrolled in District of Columbia, 5 are shown here.
Frequently Asked Questions
What is Katrina Chin Loy, M.D.'s specialty? ▼
Katrina Chin Loy, M.D. specializes in Student in an Organized Health Care Education/Training Program and practices in Washington, District of Columbia. Credentials: M.D..
How much does Katrina Chin Loy, M.D. prescribe under Medicare Part D? ▼
In 2024, Katrina Chin Loy, M.D. wrote 1,026 Medicare Part D claims totaling $55K in drug costs for 217 beneficiaries.
Where is Katrina Chin Loy, M.D. located? ▼
Katrina Chin Loy, M.D. is located at 2041 GEORGIA AVE NW, Washington, DC, 20060. Phone: (202) 865-4601.
What is Katrina Chin Loy, M.D.'s NPI number? ▼
Katrina Chin Loy, M.D.'s National Provider Identifier (NPI) is 1871851188, issued on 04/25/2012.
Does Katrina Chin Loy, M.D. prescribe more brand-name or generic drugs? ▼
Katrina Chin Loy, M.D.'s prescribing is 31% brand-name and 69% generic drugs by claim count, with $41K in brand drug costs.
How many Student in an Organized Health Care Education/Training Program providers are there in the US? ▼
There are 351,014 Student in an Organized Health Care Education/Training Program providers across 55 states in the US. The average Student in an Organized Health Care Education/Training Program provider writes 488 Medicare Part D claims per year.
What drugs does Katrina Chin Loy, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Katrina Chin Loy, M.D.'s most frequently prescribed drugs include Latanoprost, Prednisolone Acetate, Dorzolamide-Timolol. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katrina Chin Loy, M.D. accept Medicare? ▼
Katrina Chin Loy, M.D. appears in CMS Medicare data with 1,026 Part D claims and 217 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katrina Chin Loy, M.D.'s credentials? ▼
Katrina Chin Loy, M.D.'s NPI is 1871851188 with credentials M.D.. 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.
- 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.