NPI registry status
Active
2026 NPPES data Surgery Physician NPI 1053542100 MD
Verify on CMS → Aaron Lewis, MD
Surgery Physician in South Pasadena, 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 36,778 in 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
211
Medicare Part D claims · 72 beneficiaries · Surgery Physician avg: 174
Generic prescribing
68%
generic claims · 32% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
99.1/100
▲ 16 pts above national avg 83.5 · Exceptional
Industry payments
$84.3
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Aaron Lewis, MD reported a CMS MIPS final score of 99.1/100 - above the 83.5 national average - and filed 211 Medicare Part D claims in 2024.
- 99.1/100
- MIPS score · +16 vs avg
- 211
- Part D claims, 2024
- 68%
- 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 Aaron Lewis, 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 1053542100), first enumerated 08/06/2009.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 211 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 99.1/100 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
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$84.3 in reported industry payments (2 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
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Aaron Lewis, 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 1053542100 · Surgery Physician
NPI-10 · ENUM-MID · TAX-MID · MIPS-ELITE · RX-LIGHT · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1053542100
- ENUM-MID 2009
- TAX-MID 37K Surgery Physician
- MIPS-ELITE 99.1/100
- RX-LIGHT 211
- BOOK-LIGHT 3,381 in California
- PHOTO-FINISH Laura Kruper · ±0.0
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Lewis · this pro…
Lewis · this provider
99.1 MIPS pts
- Laura Kruper · n…
Laura Kruper
99.1 MIPS pts
- Ahmed Ali · near
Ahmed Ali
99.1 MIPS pts
- Michelino Scarla…
Michelino Scarlata
99.1 MIPS pts
- Preya Ananthakri…
Preya Ananthakrishnan
99.2 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Aaron Lewis, 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.
99 ≥ 91st percentile 91% 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 Aaron Lewis, MD sits
This provider among surgery physician peers
Across the 7,271 surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Aaron Lewis, MD writes more Part D claims than 79% of them and scores higher on MIPS quality than 91% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one surgery physician peer from a representative sample of 60; the gold marker is Aaron Lewis, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Aaron Lewis, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Aaron Lewis, MD?
High performer (top quartile)Primary specialty
Surgery Physician
Medicare Part D claims
211 21% vs specialty avg
MIPS final score
99.1/100 15.6 pts vs avg
Specialty distribution in California
How Surgery Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Aaron Lewis, MD's 2023 MIPS final score plotted against the Surgery Physician national average
- MIPS Final Score
- 99.1/100
- 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 | 1053542100 |
|---|---|
| Specialty | Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/06/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
99.1275
Final Score
Measured-score avg: 83.5
85.2396
Quality
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Aaron Lewis, 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.
City OF Hope Medical Foundation
South Pasadena, 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).
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 Aaron Lewis, MD. Source: openpaymentsdata.cms.gov.
Total received
$84
Largest payer
GlaxoSmithKline, LLC.
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 - 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 Aaron Lewis, MD. To verify Aaron Lewis, 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.
Brand vs generic prescribing mix · Above average
Aaron Lewis, MD - brand share 32.0%
Surgery Physician average
32% brand-name claims vs 68% generic, on 211 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.
211
Total Claims
$52K
Total Drug Cost
72
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 226.767
- Total Day Supply
- 3,677
- Brand vs Generic
- 32% brand / 68% generic
- Brand Drug Cost
- $49K
- Generic Drug Cost
- $3K
- Opioid Claims
- 21 (10.0% rate)
- Antibiotic Claims
- 44
Patient Demographics
- Average Patient Age
- 74.8 years
- Avg HCC Risk Score
- 2.30
- Gender Split
- 53% female / 47% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Aaron Lewis, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Creon
Creon
37 claims
- Metronidazole
Metronidazole
19 claims
- Neomycin Sulfate 14
Neomycin Sulfate
14 claims
| Drug | Claims |
|---|---|
| Creon Lipase/Protease/Amylase | 37 |
| Metronidazole | 19 |
| Neomycin Sulfate | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgery Physician Overview
How Aaron Lewis, MD fits within the Surgery Physician landscape nationally.
36,778
Surgery Physician Providers in US
56
States with Surgery Physician
174
Avg Claims per Provider
Aaron Lewis, MD's 211 claims are above the specialty average of 174.
Nationwide Surgery Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Lewis, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (99.1 here).
Same NPPES enumeration year (2009)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Lewis.
One of 3,381 Surgery Physician providers enrolled in California, 5 are shown here.
Dr. Oliver Aalami
M.D.
Stanford, CA
Dr. Shahram Aarabi
MD
Oakland, CA
Dr. Miriam Abaunza
M.D.
Los Angeles, CA
Dr. Benjamin Abbadessa
M.D.
San Diego, CA
Abdul-Rahman Abdel-Reheem
Los Angeles, CA
Compare Surgery Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Aaron Lewis, MD's specialty? ▼
Aaron Lewis, MD specializes in Surgery Physician and practices in South Pasadena, California. Credentials: MD.
How much does Aaron Lewis, MD prescribe under Medicare Part D? ▼
In 2024, Aaron Lewis, MD wrote 211 Medicare Part D claims totaling $52K in drug costs for 72 beneficiaries.
What is Aaron Lewis, MD's Medicare quality score? ▼
Aaron Lewis, MD has a CMS MIPS Final Score of 99.1/100 (Quality: 85.2). 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 Aaron Lewis, MD located? ▼
Aaron Lewis, MD is located at 209 FAIR OAKS AVE, South Pasadena, CA, 91030. Phone: (626) 775-3514.
What is Aaron Lewis, MD's NPI number? ▼
Aaron Lewis, MD's National Provider Identifier (NPI) is 1053542100, issued on 08/06/2009.
Does Aaron Lewis, MD prescribe more brand-name or generic drugs? ▼
Aaron Lewis, MD's prescribing is 32% brand-name and 68% generic drugs by claim count, with $49K in brand drug costs.
Does Aaron Lewis, MD prescribe opioids? ▼
Yes, Aaron Lewis, MD had 21 opioid claims in 2024 with an opioid prescribing rate of 10.0%.
How many Surgery Physician providers are there in the US? ▼
There are 36,778 Surgery Physician providers across 56 states in the US. The average Surgery Physician provider writes 174 Medicare Part D claims per year.
What drugs does Aaron Lewis, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Aaron Lewis, MD's most frequently prescribed drugs include Creon, Metronidazole, Neomycin Sulfate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Aaron Lewis, MD accept Medicare? ▼
Aaron Lewis, MD appears in CMS Medicare data with 211 Part D claims and 72 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Aaron Lewis, MD's credentials? ▼
Aaron Lewis, MD's NPI is 1053542100 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.