Dr. Timothy Euiwon Byun, MD
- Medicare services, 2024
- 1,142
- Medicare patients, 2024
- 364
- Part D claims, 2024
- 1,599
- Hospital affiliations
- 1
- Industry payments
- $145,257
- Practice address
- 200 W Center Street Promenade, Anaheim, CA 92805
- Practice phone
- Call (657) 640-8090
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Providence at Home With Compassus Home Health Orange County
Home Health Agency - Main Office · Anaheim, California
Find Dr. Byun's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Timothy Euiwon Byun is a hematologist and oncologist in Anaheim, California
Dr. Byun practices at Providence at Home With Compassus Home Health Orange County in Anaheim, California.
Dr. Byun's NPI, 1871545012, was assigned on May 16, 2006. Dr. Byun graduated from Rush Medical College in 1998. Dr. Byun's California license number on file is A70195.
- NPI
- 1871545012NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6305824491
- NPI enumeration date
- May 16, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (657) 640-8090
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Timothy Euiwon Byun practices at Providence at Home With Compassus Home Health Orange County in Anaheim, California
Dr. Byun's primary practice is Providence at Home With Compassus Home Health Orange County, at 200 W Center Street Promenade, Anaheim, CA 92805. The practice phone is (657) 640-8090.
- Providence at Home With Compassus Home Health Orange County200 W Center Street Promenade, Anaheim, CA 92805Phone(657) 640-8090
Source: Dmand AI Affiliation Data
Dr. Timothy Euiwon Byun is affiliated with 4 sites of care and 1 medical group
Dr. Byun's primary practice is Providence at Home With Compassus Home Health Orange County in Anaheim, California. Dr. Byun is also affiliated with Providence St. Joseph Hospital Orange. The medical group on file is St. Jude Heritage Medical Group. Dmand AI also links Dr. Byun to 1 more group practice or clinic and 1 hospice, each named with a free account. Dr. Byun's employer is on file too: a home health agency.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Timothy Euiwon Byun's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Byun practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Providence at Home With Compassus Home Health Orange County | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Timothy Euiwon Byun is one of 1,502 hematologists and oncologists in California
Hematology and oncology is Dr. Byun's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Byun is board certified in hematology by the American Board of Internal Medicine. Dr. Byun has a license on file in California.
Specialties and state licenses
- Hematology and oncology, CaliforniaPrimary
Clinical focus
Dmand AI lists breast cancer, chronic anemia, chronic leukemia, colorectal cancer, deep vein thrombosis (DVT), immune deficiency disease, lung cancer and lymphoma among the conditions Dr. Byun treats.
Hematologists and oncologists near Dr. Byun
Counts of hematologists and oncologists 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 Euiwon Byun billed Medicare for 1,142 services in 2024
CMS data shows 1,142 Medicare services from Dr. Byun across 14 procedure codes in 2024, for 364 Medicare patients. Medicare paid $93,333 for them.
Dr. Byun's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 8532024: 9188%
- Surgery
- 2023: 2742024: 7971%
- Tests and treatments
- 2023: 1312024: 7642%
- Lab and pathology
- 2023: 3352024: 6979%
Where Dr. Byun's Medicare services took place, 2024
- In an office1,03491%
- In a facility1089%
Dr. Byun compared with the California median for hematologists and oncologists, 2024
- Dr. Byun
- California median
- Medicare services
- 1,142vs 93223% above
- Medicare patients
- 364vs 22562% above
- Part D claims
- 1,261vs 3943.2 times
Medians across 1,367 hematologists and oncologists in California with Dmand AI profiles that report each measure.
Dr. Byun'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.
Need commercial claims for Dr. Byun?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Byun and other hematologists and oncologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Timothy Euiwon Byun treated 364 Medicare patients in 2024, average age 76
CMS counts 364 Medicare patients who saw Dr. Byun in 2024. The largest group is 75 to 84, with 155 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 30% are also on Medicaid. Their average risk score is 2.10, 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. Byun's median patient age at 72, with 54% women.
Dr. Byun's Medicare patients by age, 2024
Dr. Byun's Medicare patients by sex, 2024
- Women18751%
- Men17749%
Chronic conditions among Dr. Byun's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Cancer47%
- Diabetes33%
- Chronic kidney disease32%
- Ischemic heart disease29%
- Atrial fibrillation25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Byun'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
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Timothy Euiwon Byun wrote 1,599 Medicare Part D claims in 2024
In 2024, Dr. Byun wrote 1,599 Medicare Part D claims for 282 patients. 69% of them were for generic drugs. CMS names the drug for 1,261 of them, across 40 drugs with 11 or more claims each, at $4,704,084 in total drug cost. In 2023, CMS named 1,207 claims across 41 drugs.
Dr. Byun's Part D claims by kind of drug, 2024
- Generic1,100 claims69%
- Brand-name499 claims31%
Dr. Byun'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. Byun's Part D claims, 2024
- Opioids2%25 of 1,599 claims
- Antibiotics2%30 of 1,599 claims
- Antipsychotics, patients 65 and over2%25 of 1,599 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: 1,2072024: 1,2614%
Drugs named by CMS: 40 in 2024, 41 in 2023.
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 Euiwon Byun offers telehealth to Medicare patients
Dr. Byun accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Byun as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Timothy Euiwon Byun received $145,257 in industry payments from 2016 to 2025
CMS Open Payments shows 2,051 general payments to Dr. Byun from 95 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 42% of the total. Merck Sharp & Dohme Corporation paid the most, $44,058.
General payments to Dr. Byun by program year, 2016 to 2025
General payments to Dr. Byun by kind, 2016 to 2025
- Speaker and faculty fees$61,19042%
- Consulting fees$37,48126%
- Food and beverage$35,79425%
- Travel and lodging$10,2937%
- Other$5000%
Companies that paid Dr. Byun the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Timothy Euiwon Byun graduated from Rush Medical College
Dr. Byun graduated from Rush Medical College in 1998.
- Medical school
- Board certified in hematology
- Board certified in internal medicine
- Board certified in medical oncology
Source: Dmand AI Professional Profile Data
Dr. Timothy Euiwon Byun accepts plans from 14 insurance carriers
Dr. Byun is in network with 14 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
- Elevance
- Blue Cross Blue Shield of Michigan
- United Healthcare
- HCSC
- Humana
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Molina
- +6 more carriersWith a free account
Plan types Dr. Byun accepts, by number of carriers
- Medicare9
- PPO9
- HMO8
- EPO3
- POS3
Source: Dmand AI Insurance Network Data
Sources for Dr. Timothy Euiwon Byun's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Timothy Euiwon Byun
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 Euiwon Byun's NPI number?
Dr. Timothy Euiwon Byun's NPI number is 1871545012. It was assigned on May 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Timothy Euiwon Byun?
Dr. Timothy Euiwon Byun is a hematologist and oncologist in Anaheim, California. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Timothy Euiwon Byun practice?
Dr. Byun practices at 200 W Center Street Promenade, Anaheim, CA 92805. Dr. Byun's primary practice is Providence at Home With Compassus Home Health Orange County in Anaheim, California. Dmand AI also links Dr. Byun to 1 group practice or clinic and 1 hospice.
What is Dr. Timothy Euiwon Byun's office phone number?
The practice phone on file for Dr. Byun is (657) 640-8090.
What is Dr. Timothy Euiwon Byun's medical license number?
Dr. Byun's California license number on file is A70195.
Which hospitals is Dr. Timothy Euiwon Byun affiliated with?
Dr. Byun is affiliated with Providence St. Joseph Hospital Orange.
What medical group is Dr. Timothy Euiwon Byun part of?
Dr. Byun is linked to St. Jude Heritage Medical Group.
Does Dr. Timothy Euiwon Byun accept Medicare?
Yes. CMS data shows Dr. Byun billed Medicare for 1,142 services in 2024, and Dr. Byun accepts Medicare assignment.
Does Dr. Timothy Euiwon Byun offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Byun as offering telehealth services.
How many Medicare patients does Dr. Timothy Euiwon Byun see?
CMS counts 364 Medicare patients who saw Dr. Byun in 2024, with an average age of 76.
Show 7 more questionsShow fewer questions
Is Dr. Timothy Euiwon Byun board certified?
Yes. Dr. Byun is board certified in hematology by the American Board of Internal Medicine.
What services does Dr. Timothy Euiwon Byun bill to Medicare?
In 2024, Dr. Byun's most billed Medicare services were office visit, established patient (99214), office visit, established patient (99213) and hospital inpatient care (99233).
Where did Dr. Timothy Euiwon Byun go to medical school?
Dr. Byun graduated from Rush Medical College in 1998.
What drugs does Dr. Timothy Euiwon Byun prescribe most?
In 2024 Medicare Part D data, Dr. Byun's most prescribed drugs by claims were Anastrozole, Xtandi and Eliquis.
Has Dr. Timothy Euiwon Byun received payments from drug or device companies?
CMS Open Payments shows $145,257 in general payments to Dr. Byun from 95 companies from 2016 to 2025. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Timothy Euiwon Byun been practicing?
Dr. Byun graduated from medical school in 1998, 28 years ago.
What insurance does Dr. Timothy Euiwon Byun accept?
Dr. Byun is in network with 14 carriers, including Elevance, Blue Cross Blue Shield of Michigan and United Healthcare. Medicare plans come from the most carriers, 9. Check the plan with the practice before a visit.
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