Dr. Catherine E. Lewis, MD

  • Los Angeles, CA
  • General surgeon
NPI1215165857PAC ID9537395660
Medicare services, 2024
323
Medicare patients, 2024
189
Publications
3
MIPS score, 2024
93
Hospital affiliations
1
Practice address
757 Westwood Plaza, Los Angeles, CA 90095
Practice phone
Call (310) 825-6301
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Ronald Reagan UCLA Medical Center

Hospital · Los Angeles, California

See all 3 affiliations

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Dr. Catherine E. Lewis is a general surgeon in Los Angeles, California

Dr. Lewis practices at Ronald Reagan UCLA Medical Center in Los Angeles, California, part of University of California Health.

Dr. Lewis' NPI, 1215165857, was assigned on June 22, 2009. Dr. Lewis graduated from University Of Michigan Medical School in 2005. Dr. Lewis holds California license A100217.

NPI and contact details
Medicare PAC ID
9537395660
NPI enumeration date
June 22, 2009
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(310) 825-6301
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Female
Estimated age
47
Medical school graduation
2005

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Catherine E. Lewis practices at Ronald Reagan UCLA Medical Center in Los Angeles, California

Dr. Lewis' primary practice is Ronald Reagan UCLA Medical Center, at 757 Westwood Plaza, Los Angeles, CA 90095 in Los Angeles County. The practice phone is (310) 825-6301.

Source: Dmand AI Affiliation Data

Dr. Catherine E. Lewis is affiliated with 2 sites of care and 1 medical group

Dr. Lewis' primary practice is Ronald Reagan UCLA Medical Center in Los Angeles, California, part of University of California Health. The medical group on file is UCLA Associated General Surgeons. Dmand AI also links Dr. Lewis to 1 more group practice or clinic, named with a free account.

See all 3 affiliations for Dr. Lewis

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Catherine E. Lewis' practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Lewis practices, 2 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Ronald Reagan UCLA Medical CenterAvailable with a free account
+1 more affiliated siteAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Catherine E. Lewis is one of 2,926 general surgeons in California

Surgery is Dr. Lewis' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Lewis is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Lewis' licenses on file in 2 states: California and Washington.

Specialties and state licenses

  • Surgery, CaliforniaPrimaryLicense A100217 · 2007 to 2026 · taxonomy 208600000X
  • Washington licenseSince 2013

Clinical focus

Dmand AI lists acute gallbladder or bile duct inflammation, appendectomy, esophagus, stomach, or upper small intestine surgery, gallbladder removal, gastrointestinal obstruction and multiple traumatic injuries among the conditions Dr. Lewis treats.

General surgeons near Dr. Lewis

Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Catherine E. Lewis billed Medicare for 323 services in 2024

CMS data shows 323 Medicare services from Dr. Lewis across 5 procedure codes in 2024, for 189 Medicare patients. Medicare paid $34,255 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024323
Medicare patients189
Paid by Medicare$34,255
Procedure codes5

Dr. Lewis' Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 3422024: 3236%

Dr. Lewis compared with the California median for general surgeons, 2024

  • Dr. Lewis
  • California median
Medicare services
323vs 16695% above
Medicare patients
189vs 12156% above

Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.

Dr. Lewis' most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Lewis

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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Lewis and other general surgeons in California.

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Catherine E. Lewis treated 189 Medicare patients in 2024, average age 74

CMS counts 189 Medicare patients who saw Dr. Lewis in 2024. The largest group is 65 to 74, with 66 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 40% are also on Medicaid. Their average risk score is 2.87, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Lewis' median patient age at 47, with 36% women.

Medicare patients, 2024189
Average age74
Average risk score2.87
Also on Medicaid40%

Dr. Lewis' Medicare patients by age, 2024

Dr. Lewis' Medicare patients by sex, 2024

  • Women8847%
  • Men10153%

Chronic conditions among Dr. Lewis' Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Arthritis63%
  4. Ischemic heart disease48%
  5. Diabetes47%
  6. Chronic kidney disease44%
  7. Anxiety41%
  8. Heart failure41%

Share of Medicare patients with each condition. A patient can have several.

Dr. Lewis' patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 47

Patient panel by sex, all payers

  • Women36%
  • Men62%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Catherine E. Lewis scored 93 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 93 out of 100 for Dr. Lewis for performance year 2024, reported as part of a group. Dr. Lewis accepts Medicare assignment, so Medicare's approved amount is taken as full payment.

Accepts Medicare assignment
Yes

Dr. Lewis' MIPS scores, performance year 2024

  • 93of 100Final score
  • 69.8of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities
  • 82of 100Cost

Each score is out of 100. The final score weighs the categories CMS scored for this clinician.

Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)

Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)

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Dr. Catherine E. Lewis has 3 publications on record

Dmand AI links 3 papers to Dr. Lewis, published from 2016 to 2018. Dr. Lewis' most frequent co-authors are Areti Tillou, MD, Vatche Garen Agopian, MD and Ronald W. Busuttil, MD.

Papers3
Years published2016 to 2018

Dr. Lewis' most frequent co-authors

Recent publications by Dr. Lewis

See all 3 publications and co-authors

See who Dr. Lewis researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Lewis works with, so you can find a warm path to the right general surgeons.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Catherine E. Lewis received $133 in industry payments in 2024

CMS Open Payments shows 1 general payment to Dr. Lewis from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. Davol Inc. paid the most, $133.

Companies that paid Dr. Lewis the most, 2024 to 2024

Share is of all general payments to this clinician.

See all payments to Dr. Lewis

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Catherine E. Lewis graduated from University Of Michigan Medical School

Dr. Lewis graduated from University Of Michigan Medical School in 2005.

  1. Medical schoolUniversity Of Michigan Medical School
  2. Board certified in surgeryAmerican Board of Surgery
  3. Board certified in surgical critical careAmerican Board of Surgery

Source: Dmand AI Professional Profile Data

Dr. Catherine E. Lewis accepts plans from 7 insurance carriers

Dr. Lewis is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

  • Aetna
  • Blue Cross Blue Shield of Michigan
  • Blue Cross Blue Shield of Massachusetts
  • HCSC
  • Regence Health Plans
  • CMS Medicare
  • LA Care

Plan types Dr. Lewis accepts, by number of carriers

  1. Medicare6
  2. PPO5
  3. HMO3
  4. POS2
  5. EPO1

Source: Dmand AI Insurance Network Data

Sources for Dr. Catherine E. Lewis's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Catherine E. Lewis

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Catherine E. Lewis' NPI number?

Dr. Catherine E. Lewis' NPI number is 1215165857. It was assigned on June 22, 2009, and it is active in the NPI Registry.

What kind of doctor is Dr. Catherine E. Lewis?

Dr. Catherine E. Lewis is a general surgeon in Los Angeles, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).

Where does Dr. Catherine E. Lewis practice?

Dr. Lewis practices at 757 Westwood Plaza, Los Angeles, CA 90095. Dr. Lewis' primary practice is Ronald Reagan UCLA Medical Center in Los Angeles, California, part of University of California Health. Dmand AI also links Dr. Lewis to 1 group practice or clinic.

What is Dr. Catherine E. Lewis' office phone number?

The practice phone on file for Dr. Lewis is (310) 825-6301.

What is Dr. Catherine E. Lewis' medical license number?

Dr. Lewis holds California license A100217, one of the licenses on file in 2 states.

Which states has Dr. Catherine E. Lewis been licensed in?

Dmand AI has state licenses on file for Dr. Lewis in California (2007 to 2026) and Washington (since 2013).

Which hospitals is Dr. Catherine E. Lewis affiliated with?

Dr. Lewis practices at Ronald Reagan UCLA Medical Center in Los Angeles, California.

What medical group is Dr. Catherine E. Lewis part of?

Dr. Lewis is linked to UCLA Associated General Surgeons.

Does Dr. Catherine E. Lewis accept Medicare?

Yes. CMS data shows Dr. Lewis billed Medicare for 323 services in 2024, and Dr. Lewis accepts Medicare assignment.

What is Dr. Catherine E. Lewis' MIPS score?

Dr. Lewis' MIPS final score for performance year 2024 is 93 out of 100, reported as part of a group.

Show 9 more questionsShow fewer questions

How many Medicare patients does Dr. Catherine E. Lewis see?

CMS counts 189 Medicare patients who saw Dr. Lewis in 2024, with an average age of 74.

Is Dr. Catherine E. Lewis board certified?

Yes. Dr. Lewis is board certified in surgery by the American Board of Surgery.

What services does Dr. Catherine E. Lewis bill to Medicare?

In 2024, Dr. Lewis' most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99223) and hospital inpatient care (99232).

Where did Dr. Catherine E. Lewis go to medical school?

Dr. Lewis graduated from University Of Michigan Medical School in 2005.

Has Dr. Catherine E. Lewis received payments from drug or device companies?

CMS Open Payments shows $133 in general payments to Dr. Lewis from 1 company from 2024 to 2024. The largest total came from Davol Inc.

How long has Dr. Catherine E. Lewis been practicing?

Dr. Lewis graduated from medical school in 2005, 21 years ago.

Does Dr. Catherine E. Lewis do research?

Dmand AI links 3 publications to Dr. Lewis, published from 2016 to 2018.

Who does Dr. Catherine E. Lewis publish with?

Dr. Lewis' most frequent co-authors are Areti Tillou, MD (2 shared papers), Vatche Garen Agopian, MD (1 shared paper) and Ronald W. Busuttil, MD (1 shared paper).

What insurance does Dr. Catherine E. Lewis accept?

Dr. Lewis is in network with 7 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.

Selling to surgery practices?

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