NPI registry status
Active
2026 NPPES data Orthopaedic Hand Surgery Physician NPI 1669547857 MD
Verify on CMS → Leo Kroonen, MD
Orthopaedic Hand Surgery Physician in San Diego, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 2,013 in Orthopaedic Hand Surgery 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
177
Medicare Part D claims · 71 beneficiaries · Orthopaedic Hand Surgery Physician avg: 185
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Leo Kroonen, MD filed 177 Medicare Part D claims in 2024 as an Orthopaedic Hand Surgery Physician in San Diego, California.
- 177
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥34th
- 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 Leo Kroonen, MD
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 1669547857), first enumerated 11/22/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 177 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
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Leo Kroonen, MD's individual license status. Verify directly with the state medical board.
Source: MBC 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 1669547857 · Orthopaedic Hand Surgery Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1669547857
- ENUM-LEGACY 2006
- TAX-NARROW 2,013
- RX-LIGHT 177
- BOOK-THIN 225 in California
- PHOTO-ENUM Lacy Thornburg · 2006
Leo Kroonen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
177 ≥ 34th percentile 34% 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)
Leo Kroonen, MD 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 Leo Kroonen, MD?
Quality data not reportedPrimary specialty
Orthopaedic Hand Surgery Physician
Medicare Part D claims
177 4% vs specialty avg
Specialty distribution in California
How Orthopaedic Hand Surgery Physician compares to other specialties among California 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 Orthopaedic Hand Surgery 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 | 1669547857 |
|---|---|
| Specialty | Orthopaedic Hand Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/22/2006 |
Hospital and facility affiliations
Facilities where Leo Kroonen, 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.
Southern California Permanente Medical Group
Simi Valley, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - California MBC 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 ~150K California medical licensees in 2023 - they are NOT specific to Leo Kroonen, MD. To verify Leo Kroonen, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC 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 California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
177
Total Claims
$1K
Total Drug Cost
71
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 186.533
- Total Day Supply
- 3,361
- Brand Drug Cost
- $0
- Generic Drug Cost
- $1K
- Opioid Claims
- 45 (25.4% rate)
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 0.92
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Leo Kroonen, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Ibuprofen
Ibuprofen
50 claims
- Meloxicam
Meloxicam
48 claims
- Oxycodone Hcl
Oxycodone Hcl
22 claims
- Hydrocodone-Acetam… 18
Hydrocodone-Acetaminophen
18 claims
- Gabapentin 17
Gabapentin
17 claims
- Ondansetron Hcl 16
Ondansetron Hcl
16 claims
| Drug | Claims |
|---|---|
| Ibuprofen | 50 |
| Meloxicam | 48 |
| Oxycodone Hcl | 22 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 18 |
| Gabapentin | 17 |
| Ondansetron Hcl | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Orthopaedic Hand Surgery Physician Overview
How Leo Kroonen, MD fits within the Orthopaedic Hand Surgery Physician landscape nationally.
2,013
Orthopaedic Hand Surgery Physician Providers in US
52
States with Orthopaedic Hand Surgery Physician
185
Avg Claims per Provider
Leo Kroonen, MD's 177 claims are below the specialty average of 185.
Nationwide Orthopaedic Hand Surgery Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Kroonen, both outside California 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 Orthopaedic Hand Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Kroonen.
One of 225 Orthopaedic Hand Surgery Physician providers enrolled in California, 5 are shown here.
Dr. Reid Abrams
MD
San Diego, CA
Dr. Anna Acosta
M.D.
Long Beach, CA
Dr. Seth Ahlquist
MD
Santa Monica, CA
Dr. Richard Ahn
M.D.
Lakewood, CA
Dr. Robert Allen
MD
Sacramento, CA
Compare Orthopaedic Hand Surgery Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Leo Kroonen, MD's specialty? ▼
Leo Kroonen, MD specializes in Orthopaedic Hand Surgery Physician and practices in San Diego, California. Credentials: MD.
How much does Leo Kroonen, MD prescribe under Medicare Part D? ▼
In 2024, Leo Kroonen, MD wrote 177 Medicare Part D claims totaling $1K in drug costs for 71 beneficiaries.
Where is Leo Kroonen, MD located? ▼
Leo Kroonen, MD is located at 34800 BOB WILSON DR, San Diego, CA, 92134. Phone: (619) 532-8429.
What is Leo Kroonen, MD's NPI number? ▼
Leo Kroonen, MD's National Provider Identifier (NPI) is 1669547857, issued on 11/22/2006.
Does Leo Kroonen, MD prescribe opioids? ▼
Yes, Leo Kroonen, MD had 45 opioid claims in 2024 with an opioid prescribing rate of 25.4%.
How many Orthopaedic Hand Surgery Physician providers are there in the US? ▼
There are 2,013 Orthopaedic Hand Surgery Physician providers across 52 states in the US. The average Orthopaedic Hand Surgery Physician provider writes 185 Medicare Part D claims per year.
What drugs does Leo Kroonen, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Leo Kroonen, MD's most frequently prescribed drugs include Ibuprofen, Meloxicam, Oxycodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Leo Kroonen, MD accept Medicare? ▼
Leo Kroonen, MD appears in CMS Medicare data with 177 Part D claims and 71 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Leo Kroonen, MD's credentials? ▼
Leo Kroonen, MD's NPI is 1669547857 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.
- 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.