NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1639138654
Verify on CMS → Sixto Caro
Internal Medicine Physician in Brooklyn, New York.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 174,792 in Internal 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
40K
Medicare Part D claims · 2K beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
74%
generic claims · 23% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.2K
62 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Sixto Caro filed 39,557 Medicare Part D claims in 2024 as an Internal Medicine Physician in Brooklyn, New York, prescribing 74% generic.
- 40K
- Part D claims, 2024
- 74%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥98th
- 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 Sixto Caro
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 1639138654), first enumerated 03/20/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 39,557 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- 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
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$1.2K in reported industry payments (62 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
New York statewide board action statistics are published annually — these figures describe aggregate state activity, not Sixto Caro's individual license status. Verify directly with the state medical board.
Source: NYSBPMC annual report 2023
- 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 1639138654 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-HEAVY · BOOK-MID · PHOTO-ENUM
- NPI-10 1639138654
- ENUM-LEGACY 2006
- TAX-MEGA 175K Internal Medicine
- RX-HEAVY 40K claims
- BOOK-MID 13,725 in New York
- PHOTO-ENUM Jeffrey Elliott, MD · 2006
Sixto Caro's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
39,557 ≥ 98th percentile 98% 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
✓
Board certification likely (heuristic, not verified)
Sixto Caro practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - 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 Sixto Caro?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
39,557 14× vs specialty avg
Specialty distribution in New York
How Internal Medicine Physician compares to other specialties among New York 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 Internal Medicine Physician. 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 | 1639138654 |
|---|---|
| Specialty | Internal Medicine Physician |
| Gender | Male |
| NPI Issued | 03/20/2006 |
Hospital and facility affiliations
Facilities where Sixto Caro 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.
Williamsburgh Internal Medicine P.C.
Brooklyn, NY
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 Sixto Caro. Source: openpaymentsdata.cms.gov.
Total received
$1.2K
Largest payer
PFIZER INC.
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 - New York NYSBPMC 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 ~100K New York medical licensees in 2023 - they are NOT specific to Sixto Caro. To verify Sixto Caro's current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases
NYSBPMC 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 New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Sixto Caro - brand share 23.0%
Internal Medicine Physician average
23% brand-name claims vs 74% generic, on 39,557 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.
39,557
Total Claims
$7.0M
Total Drug Cost
1,514
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 86,879.633
- Total Day Supply
- 2,576,979
- Brand vs Generic
- 23% brand / 74% generic
- Brand Drug Cost
- $5.8M
- Generic Drug Cost
- $1.2M
- Opioid Claims
- 268 (0.7% rate)
- Antibiotic Claims
- 491
Patient Demographics
- Average Patient Age
- 74.2 years
- Avg HCC Risk Score
- 1.35
- Gender Split
- 62% female / 38% male
- Age Distribution
- <65: 151, 65-74: 671, 75-84: 467, 85+: 225
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Sixto Caro prescribes most
Top Medicare Part D drugs by claim count, 2024
- Atorvastatin Calcium
Atorvastatin Calcium
1,732 claims
- Montelukast Sodium
Montelukast Sodium
1,250 claims
- Vitamin D2
Vitamin D2
1,054 claims
- Amlodipine Besylate
Amlodipine Besylate
1,005 claims
- Omeprazole
Omeprazole
903 claims
- Losartan Potassium
Losartan Potassium
766 claims
- Alcohol Prep Pads
Alcohol Prep Pads
741 claims
- Levothyroxine Sodium
Levothyroxine Sodium
723 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 1,732 |
| Montelukast Sodium | 1,250 |
| Vitamin D2 Ergocalciferol (Vitamin D2) | 1,054 |
| Amlodipine Besylate | 1,005 |
| Omeprazole | 903 |
| Losartan Potassium | 766 |
| Alcohol Prep Pads Alcohol Antiseptic Pads | 741 |
| Levothyroxine Sodium | 723 |
| Diclofenac Sodium | 693 |
| Farxiga Dapagliflozin Propanediol | 678 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Sixto Caro fits within the Internal Medicine Physician landscape nationally.
174,792
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,785
Avg Claims per Provider
Sixto Caro's 39,557 claims are above the specialty average of 2,785.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Caro, both outside New York so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Caro.
One of 13,725 Internal Medicine Physician providers enrolled in New York, 5 are shown here.
Dr. Deborah Aanonsen
D.O.
Staten Island, NY
Dr. Nivedita Aanur
M.D.
New York, NY
Dr. Jay Aaron
MD
Great Neck, NY
Dr. Justin Aaron
MD
New York, NY
Ahmad Abadi
Poughkeepsie, NY
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Sixto Caro's specialty? ▼
Sixto Caro specializes in Internal Medicine Physician and practices in Brooklyn, New York.
How much does Sixto Caro prescribe under Medicare Part D? ▼
In 2024, Sixto Caro wrote 39,557 Medicare Part D claims totaling $7.0M in drug costs for 1,514 beneficiaries.
Where is Sixto Caro located? ▼
Sixto Caro is located at 231 S 3RD ST, Brooklyn, NY, 11211. Phone: (718) 599-0505.
What is Sixto Caro's NPI number? ▼
Sixto Caro's National Provider Identifier (NPI) is 1639138654, issued on 03/20/2006.
Does Sixto Caro prescribe more brand-name or generic drugs? ▼
Sixto Caro's prescribing is 23% brand-name and 74% generic drugs by claim count, with $5.8M in brand drug costs.
Does Sixto Caro prescribe opioids? ▼
Yes, Sixto Caro had 268 opioid claims in 2024 with an opioid prescribing rate of 0.7%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 174,792 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,785 Medicare Part D claims per year.
What drugs does Sixto Caro prescribe most often? ▼
Based on 2024 Medicare Part D data, Sixto Caro's most frequently prescribed drugs include Atorvastatin Calcium, Montelukast Sodium, Vitamin D2. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Sixto Caro accept Medicare? ▼
Sixto Caro appears in CMS Medicare data with 39,557 Part D claims and 1,514 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Sixto Caro's credentials? ▼
Sixto Caro's NPI is 1639138654. 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.