Dr. Byung Lee, DO

  • Pasadena, CA
  • Hematologist and oncologist
NPI1780975136PAC ID8628232105
Medicare services, 2024
92
Medicare patients, 2024
59
Part D claims, 2024
3,076
Industry payments
$28,226
Affiliated sites
2
Practice address
959 E Walnut St, Pasadena, CA 91106
Practice phone
Call (323) 264-0430
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Hematology Oncology Specialists

Pasadena, California

See all 5 affiliations

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Dr. Byung Lee is a hematologist and oncologist in Pasadena, California

Dr. Lee practices at Hematology Oncology Specialists in Pasadena, California.

Dr. Lee's NPI, 1780975136, was assigned on April 20, 2011. Dr. Lee graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2005. Dr. Lee's California license number on file is 20A12262.

NPI and contact details
Medicare PAC ID
8628232105
NPI enumeration date
April 20, 2011
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(323) 264-0430
Professional email
Get email
Personal email
Get email
Mobile number
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Sex
Male
Estimated age
47
Medical school graduation
2005

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

Dr. Byung Lee practices at Hematology Oncology Specialists in Pasadena, California

Dr. Lee's primary practice is Hematology Oncology Specialists, at 959 E Walnut St, Pasadena, CA 91106 in Los Angeles County. The practice phone is (323) 264-0430.

  • Hematology Oncology Specialists
    959 E Walnut St, Pasadena, CA 91106 · Los Angeles CountyPhone(323) 264-0430

Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data

Dr. Byung Lee is affiliated with 3 sites of care and 2 medical groups

Dr. Lee's primary practice is Hematology Oncology Specialists in Pasadena, California. The medical group on file is Hematology Oncology Specialists. Dmand AI also links Dr. Lee to 2 more group practices and clinics and 1 medical group, each named with a free account.

See all 5 affiliations for Dr. Lee

Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data

Dmand AI tracks the EHR system at Dr. Byung 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
Hematology Oncology SpecialistsAvailable with a free account
+2 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Byung Lee is one of 1,502 hematologists and oncologists in California

Hematology and oncology is Dr. Lee's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Lee is board certified in hematology by the American Board of Internal Medicine. Dmand AI has Dr. Lee's licenses on file in 2 states: California and New York.

Specialties and state licenses

  • Hematology and oncology, CaliforniaPrimaryLicense 20A12262 · 2012 to 2025 · taxonomy 207RH0003X
  • New York license2009 to 2012

Clinical focus

Dmand AI lists chronic anemia, deep vein thrombosis (DVT), lymphoma, multiple myeloma, neutropenia and purpura and thrombocytopenia among the conditions Dr. Lee treats.

Hematologists and oncologists near Dr. Lee

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

1,502hematologists and oncologists in California
7hematologists and oncologists in Pasadena

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

Dr. Byung Lee billed Medicare for 92 services in 2024

CMS data shows 92 Medicare services from Dr. Lee across 2 procedure codes in 2024, for 59 Medicare patients. Medicare paid $5,880 for them. Every service was in an office.

Medicare services, 202492
Medicare patients59
Paid by Medicare$5,880
Procedure codes2

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

  • 2023
  • 2024
Office and hospital visits
2023: 872024: 926%

Dr. Lee compared with the California median for hematologists and oncologists, 2024

  • Dr. Lee
  • California median
Medicare services
92vs 93290% below
Medicare patients
59vs 22574% below
Part D claims
2,816vs 3947.1 times

Medians across 1,367 hematologists and oncologists 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. Byung Lee treated 59 Medicare patients in 2024, average age 74

CMS counts 59 Medicare patients who saw Dr. Lee in 2024. The largest group is 65 to 74, with 28 patients. 71% of them have high blood pressure, and 64% have high cholesterol. Their average risk score is 1.56, 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. Lee's median patient age at 72, with 62% women.

Medicare patients, 202459
Average age74
Average risk score1.56

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

  • Women3153%
  • Men2847%

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

  1. High blood pressure71%
  2. High cholesterol64%
  3. Cancer37%
  4. Arthritis31%
  5. Chronic kidney disease31%
  6. Diabetes29%
  7. Ischemic heart disease19%

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 72

Patient panel by sex, all payers

  • Women62%
  • Men37%

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

Dr. Byung Lee wrote 3,076 Medicare Part D claims in 2024

In 2024, Dr. Lee wrote 3,076 Medicare Part D claims for 539 patients. 59% of them were for generic drugs. CMS names the drug for 2,816 of them, across 46 drugs with 11 or more claims each, at $12,198,446 in total drug cost. In 2023, CMS named 2,836 claims across 45 drugs.

Part D claims, 20243,076
Drugs named by CMS46
Total drug cost$12.2M
Part D patients539

Dr. Lee's Part D claims by kind of drug, 2024

  • Generic1,825 claims59%
  • Brand-name1,251 claims41%

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.

Drug classes CMS tracks in Dr. Lee's Part D claims, 2024

  • Opioids2%49 of 3,076 claims
  • Antipsychotics, patients 65 and over1%42 of 3,076 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 2,8362024: 2,8161%

Drugs named by CMS: 46 in 2024, 45 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. Byung Lee offers telehealth to Medicare patients

Dr. Lee accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Lee as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Dr. Byung Lee received $28,226 in industry payments from 2016 to 2025

CMS Open Payments shows 1,314 general payments to Dr. Lee from 78 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 88% of the total. Novartis Pharmaceuticals Corporation paid the most, $4,912.

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

General payments to Dr. Lee by kind, 2016 to 2025

$28.2Kin total
  • Food and beverage$24,76788%
  • Device or supply loans$2,4989%
  • Education$7513%
  • Speaker and faculty fees$2101%

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. Byung Lee graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury

Dr. Lee graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2005.

  1. Medical schoolNew York Institute of Technology College of Osteopathic Medicine - Old Westbury
  2. Board certified in hematologyAmerican Board of Internal Medicine
  3. Board certified in medical oncologyAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Byung Lee accepts plans from 15 insurance carriers

Dr. Lee is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.

  • Aetna
  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • HCSC
  • Blue Cross Blue Shield of Massachusetts
  • Elevance
  • Molina
  • Regence Health Plans
  • +7 more carriersWith a free account

Plan types Dr. Lee accepts, by number of carriers

  1. HMO8
  2. Medicare8
  3. PPO8
  4. EPO4
  5. POS3

Source: Dmand AI Insurance Network Data

Sources for Dr. Byung 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 phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation 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)
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. Byung 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. Byung Lee's NPI number?

Dr. Byung Lee's NPI number is 1780975136. It was assigned on April 20, 2011, and it is active in the NPI Registry.

What kind of doctor is Dr. Byung Lee?

Dr. Byung Lee is a hematologist and oncologist in Pasadena, California. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).

Where does Dr. Byung Lee practice?

Dr. Lee practices at 959 E Walnut St, Pasadena, CA 91106. Dr. Lee's primary practice is Hematology Oncology Specialists in Pasadena, California. Dmand AI also links Dr. Lee to 2 group practices and clinics and 1 medical group.

What is Dr. Byung Lee's office phone number?

The practice phone on file for Dr. Lee is (323) 264-0430.

What is Dr. Byung Lee's medical license number?

Dr. Lee's California license number on file is 20A12262, one of the licenses on file in 2 states.

Which states has Dr. Byung Lee been licensed in?

Dmand AI has state licenses on file for Dr. Lee in California (2012 to 2025) and New York (2009 to 2012).

What medical group is Dr. Byung Lee part of?

Dr. Lee is linked to Hematology Oncology Specialists. Dmand AI links Dr. Lee to 1 more medical group.

Does Dr. Byung Lee accept Medicare?

Yes. CMS data shows Dr. Lee billed Medicare for 92 services in 2024, and Dr. Lee accepts Medicare assignment.

Does Dr. Byung Lee offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Lee as offering telehealth services.

How many Medicare patients does Dr. Byung Lee see?

CMS counts 59 Medicare patients who saw Dr. Lee in 2024, with an average age of 74.

Show 7 more questionsShow fewer questions

Is Dr. Byung Lee board certified?

Yes. Dr. Lee is board certified in hematology by the American Board of Internal Medicine.

What services does Dr. Byung Lee bill to Medicare?

In 2024, Dr. Lee's most billed Medicare services were office visit, established patient (99213) and care management and other visits (99442).

Where did Dr. Byung Lee go to medical school?

Dr. Lee graduated from New York Institute of Technology College of Osteopathic Medicine - Old Westbury in 2005.

What drugs does Dr. Byung Lee prescribe most?

In 2024 Medicare Part D data, Dr. Lee's most prescribed drugs by claims were Anastrozole, Procrit and Prednisone.

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

CMS Open Payments shows $28,226 in general payments to Dr. Lee from 78 companies from 2016 to 2025. The largest total came from Novartis Pharmaceuticals Corporation.

How long has Dr. Byung Lee been practicing?

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

What insurance does Dr. Byung Lee accept?

Dr. Lee is in network with 15 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. HMO plans come from the most carriers, 8. Check the plan with the practice before a visit.

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