Dr. Timothy Mark Lee, MD

  • Laguna Hills, CA
  • Cardiothoracic surgeon
NPI1881988962PAC ID7618366097
Medicare services, 2024
278
Medicare patients, 2024
197
Part D claims, 2024
96
Publications
6
MIPS score, 2024
88
Practice address
24451 Health Center Drive, Laguna Hills, CA 92653
Practice phone
Call (949) 837-4500
Professional email
Get professional email
Personal email
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Mobile number
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Social profiles

Primary practice

MemorialCare Saddleback Medical Center

Hospital · Laguna Hills, California

See all 3 affiliations

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Dr. Timothy Mark Lee is a cardiothoracic surgeon in Laguna Hills, California

Dr. Lee practices at MemorialCare Saddleback Medical Center in Laguna Hills, California, part of MemorialCare Health System.

Dr. Lee's NPI, 1881988962, was assigned on June 6, 2011. Dr. Lee graduated from University Of Michigan Medical School in 2011. Dr. Lee's California license number on file is A154790.

NPI and contact details
Medicare PAC ID
7618366097
NPI enumeration date
June 6, 2011
NPI status
Active
Accepts Medicare assignment
Yes
Practice phone
(949) 837-4500
Professional email
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Personal email
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Mobile number
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Sex
Male
Estimated age
41
Medical school graduation
2011

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

Dr. Timothy Mark Lee practices at MemorialCare Saddleback Medical Center in Laguna Hills, California

Dr. Lee's primary practice is MemorialCare Saddleback Medical Center, at 24451 Health Center Drive, Laguna Hills, CA 92653 in Orange County. The practice phone is (949) 837-4500.

Source: Dmand AI Affiliation Data

Dr. Timothy Mark Lee is affiliated with 2 sites of care and 1 medical group

Dr. Lee's primary practice is MemorialCare Saddleback Medical Center in Laguna Hills, California, part of MemorialCare Health System. The medical group on file is MemorialCare Medical Group. Dmand AI also links Dr. Lee to 1 more group practice or clinic, named with a free account.

See all 3 affiliations for Dr. Lee

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

Dmand AI tracks the EHR system at Dr. Timothy Mark Lee's practice

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

EHR by site
SiteEHR vendor and product
MemorialCare Saddleback 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. Timothy Mark Lee is one of 568 cardiothoracic surgeons in California

Thoracic surgery (cardiothoracic vascular surgery) is Dr. Lee's primary specialty in the NPI Registry, under taxonomy code 208G00000X. Dr. Lee is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Lee's licenses on file in 2 states: California and Pennsylvania.

Specialties and state licenses

  • Thoracic surgery (cardiothoracic vascular surgery), CaliforniaPrimaryLicense A154790 · 2018 to 2025 · taxonomy 208G00000X
  • Pennsylvania license2016 to 2018

Clinical focus

Dmand AI lists heart bypass surgery and heart valve surgery among the conditions Dr. Lee treats.

Cardiothoracic surgeons near Dr. Lee

Counts of cardiothoracic 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. Timothy Mark Lee billed Medicare for 278 services in 2024

CMS data shows 278 Medicare services from Dr. Lee across 10 procedure codes in 2024, for 197 Medicare patients. Medicare paid $97,093 for them. Every service was in a facility, such as a hospital, rather than an office.

Medicare services, 2024278
Medicare patients197
Paid by Medicare$97,093
Procedure codes10

Dr. Lee's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 852024: 174105%
Surgery
2023: 722024: 10444%

Dr. Lee compared with the California median for cardiothoracic surgeons, 2024

  • Dr. Lee
  • California median
Medicare services
278vs 1142.4 times
Medicare patients
197vs 952.1 times
Part D claims
82vs 194.3 times

Medians across 453 cardiothoracic surgeons in California with Dmand AI profiles that report each measure.

Dr. Lee's 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. Lee

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

Dr. Timothy Mark Lee treated 197 Medicare patients in 2024, average age 75

CMS counts 197 Medicare patients who saw Dr. Lee in 2024. The largest group is 65 to 74, with 100 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 9% are also on Medicaid. Their average risk score is 1.31, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Lee's median patient age at 76, with 28% women.

Medicare patients, 2024197
Average age75
Average risk score1.31
Also on Medicaid9%

Dr. Lee's Medicare patients by age, 2024

CMS leaves out age groups with fewer than 11 patients.

Dr. Lee's Medicare patients by sex, 2024

  • Women5327%
  • Men14473%

Chronic conditions among Dr. Lee's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Ischemic heart disease72%
  4. Arthritis49%
  5. Atrial fibrillation49%
  6. Heart failure40%
  7. Diabetes29%
  8. Chronic kidney disease25%

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

Dr. Lee's patients across all payers

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

Patient panel by age, all payers

Median age 76

Patient panel by sex, all payers

  • Women28%
  • Men70%

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

Dr. Timothy Mark Lee wrote 96 Medicare Part D claims in 2024

In 2024, Dr. Lee wrote 96 Medicare Part D claims for 76 patients. 100% of them were for generic drugs. CMS names the drug for 82 of them, across 2 drugs with 11 or more claims each, at $543 in total drug cost. In 2023, CMS named 37 claims across 1 drug.

Part D claims, 202496
Drugs named by CMS2
Total drug cost$543
Part D patients76

Dr. Lee's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 372024: 82122%

Drugs named by CMS: 2 in 2024, 1 in 2023.

See all prescribing by Dr. Lee

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Timothy Mark Lee scored 88 out of 100 in Medicare's MIPS program for 2024

CMS publishes a Merit-based Incentive Payment System (MIPS) score of 88 out of 100 for Dr. Lee for performance year 2024, reported as part of a group. Dr. Lee accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 32 procedures of coronary artery bypass graft (cabg) by Dr. Lee, more than 86% of the clinicians it reports for that procedure.

Accepts Medicare assignment
Yes

Dr. Lee's MIPS scores, performance year 2024

  • 88of 100Final score
  • 84.1of 100Quality
  • 100of 100Promoting Interoperability
  • 40of 100Improvement Activities
  • 74of 100Cost

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

Where Dr. Lee ranks in Medicare procedure volume

Coronary artery bypass graft (CABG)
86th percentile32 procedures

CMS ranks each clinician against every clinician it reports for the same procedure category.

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. Timothy Mark Lee has 6 publications on record

Dmand AI links 6 papers to Dr. Lee, published from 2011 to 2023. The most frequent topics are Aortic Valve Stenosis, Heart Valve Prosthesis and Heart Valve Prosthesis Implantation. Dr. Lee has published most often in Ann Thorac Surg. Dr. Lee's most frequent co-authors are Percy Boateng, MD, David H. Adams, MD and Sophia Leonora Alexis, MD.

Papers6
Years published2011 to 2023

Dr. Lee's papers by year, 2011 to 2023

Topics Dr. Lee writes about most

  • Aortic Valve Stenosis
  • Heart Valve Prosthesis
  • Heart Valve Prosthesis Implantation
  • Mitral Valve Insufficiency
  • Prosthesis Design
  • Pulmonary Artery

Dr. Lee's most frequent co-authors

Recent publications by Dr. Lee

See all 6 publications and co-authors

See who Dr. Lee researches with

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

How network discovery works

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

Dr. Timothy Mark Lee received $1,993 in industry payments from 2016 to 2025

CMS Open Payments shows 36 general payments to Dr. Lee from 11 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. AtriCure, Inc. paid the most, $864.

General payments to Dr. Lee by program year, 2016 to 2025

Companies that paid Dr. Lee the most, 2016 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Lee

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

Dr. Timothy Mark Lee graduated from University Of Michigan Medical School

Dr. Lee graduated from University Of Michigan Medical School in 2011.

  1. Medical schoolUniversity Of Michigan Medical School
  2. Board certified in surgeryAmerican Board of Surgery
  3. Board certified in thoracic and cardiac surgeryAmerican Board of Thoracic Surgery

Source: Dmand AI Professional Profile Data

Dr. Timothy Mark Lee accepts plans from 11 insurance carriers

Dr. Lee is in network with 11 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

  • Aetna
  • Elevance
  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • HCSC
  • Blue Cross Blue Shield of Massachusetts
  • Alliant Health Plans
  • Blue Cross and Blue Shield of Kansas City
  • +3 more carriersWith a free account

Plan types Dr. Lee accepts, by number of carriers

  1. Medicare7
  2. PPO7
  3. HMO6
  4. EPO4
  5. POS4

Source: Dmand AI Insurance Network Data

Sources for Dr. Timothy Mark Lee'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)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - 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. Timothy Mark Lee

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. Timothy Mark Lee's NPI number?

Dr. Timothy Mark Lee's NPI number is 1881988962. It was assigned on June 6, 2011, and it is active in the NPI Registry.

What kind of doctor is Dr. Timothy Mark Lee?

Dr. Timothy Mark Lee is a cardiothoracic surgeon in Laguna Hills, California. The primary specialty in the NPI Registry is Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (taxonomy code 208G00000X).

Where does Dr. Timothy Mark Lee practice?

Dr. Lee practices at 24451 Health Center Drive, Laguna Hills, CA 92653. Dr. Lee's primary practice is MemorialCare Saddleback Medical Center in Laguna Hills, California, part of MemorialCare Health System. Dmand AI also links Dr. Lee to 1 group practice or clinic.

What is Dr. Timothy Mark Lee's office phone number?

The practice phone on file for Dr. Lee is (949) 837-4500.

What is Dr. Timothy Mark Lee's medical license number?

Dr. Lee's California license number on file is A154790, one of the licenses on file in 2 states.

Which states has Dr. Timothy Mark Lee been licensed in?

Dmand AI has state licenses on file for Dr. Lee in California (2018 to 2025) and Pennsylvania (2016 to 2018).

Which hospitals is Dr. Timothy Mark Lee affiliated with?

Dr. Lee practices at MemorialCare Saddleback Medical Center in Laguna Hills, California.

What medical group is Dr. Timothy Mark Lee part of?

Dr. Lee is linked to MemorialCare Medical Group.

Does Dr. Timothy Mark Lee accept Medicare?

Yes. CMS data shows Dr. Lee billed Medicare for 278 services in 2024, and Dr. Lee accepts Medicare assignment.

What is Dr. Timothy Mark Lee's MIPS score?

Dr. Lee's MIPS final score for performance year 2024 is 88 out of 100, reported as part of a group.

Show 10 more questionsShow fewer questions

How many Medicare patients does Dr. Timothy Mark Lee see?

CMS counts 197 Medicare patients who saw Dr. Lee in 2024, with an average age of 75.

Is Dr. Timothy Mark Lee board certified?

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

What services does Dr. Timothy Mark Lee bill to Medicare?

In 2024, Dr. Lee's most billed Medicare services were office visit, new patient (99205), surgery: heart and blood vessels (33533) and office visit, established patient (99214).

Where did Dr. Timothy Mark Lee go to medical school?

Dr. Lee graduated from University Of Michigan Medical School in 2011.

What drugs does Dr. Timothy Mark Lee prescribe most?

In 2024 Medicare Part D data, Dr. Lee's most prescribed drugs by claims were Mupirocin and Gabapentin.

Has Dr. Timothy Mark Lee received payments from drug or device companies?

CMS Open Payments shows $1,993 in general payments to Dr. Lee from 11 companies from 2016 to 2025. The largest total came from AtriCure, Inc.

How long has Dr. Timothy Mark Lee been practicing?

Dr. Lee graduated from medical school in 2011, 15 years ago.

Does Dr. Timothy Mark Lee do research?

Dmand AI links 6 publications to Dr. Lee, published from 2011 to 2023.

Who does Dr. Timothy Mark Lee publish with?

Dr. Lee's most frequent co-authors are Percy Boateng, MD (2 shared papers), David H. Adams, MD (1 shared paper) and Sophia Leonora Alexis, MD (1 shared paper).

What insurance does Dr. Timothy Mark Lee accept?

Dr. Lee is in network with 11 carriers, including Aetna, Elevance and Blue Cross Blue Shield of Michigan. Medicare plans come from the most carriers, 7. Check the plan with the practice before a visit.

Selling to thoracic surgery (cardiothoracic vascular surgery) practices?

See cardiothoracic surgeons in California by site of care and group

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