Dr. Jeffrey Yoonjae Ahn, MD
- Medicare services, 2024
- 37
- Medicare patients, 2024
- 34
- Publications
- 5
- Hospital affiliations
- 1
- Industry payments
- $35
- Practice address
- 101 City Drive South, Orange, CA 92868
- Practice phone
- Call (714) 456-7890
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Ahn'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. Jeffrey Yoonjae Ahn is a hematologist and oncologist in Orange, California
Dr. Ahn practices at UCI Health - Orange in Orange, California, part of UC Irvine.
Dr. Ahn's NPI, 1902331630, was assigned on May 1, 2017. Dr. Ahn graduated from Medical College of Georgia in 2017. Dr. Ahn holds California license A159137.
- NPI
- 1902331630NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1355888322
- NPI enumeration date
- May 1, 2017
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (714) 456-7890
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 35
- Medical school graduation
- 2017
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jeffrey Yoonjae Ahn practices at UCI Health - Orange in Orange, California
Dr. Ahn's primary practice is UCI Health - Orange, at 101 City Drive South, Orange, CA 92868 in Orange County. The practice phone is (714) 456-7890.
- UCI Health - Orange101 City Drive South, Orange, CA 92868 · Orange CountyPhone(714) 456-7890
Source: Dmand AI Affiliation Data
Dr. Jeffrey Yoonjae Ahn is affiliated with 1 site of care and 2 medical groups
Dr. Ahn's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. The medical group on file is UCI Health Physicians. Dmand AI also links Dr. Ahn to 1 more medical group, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Jeffrey Yoonjae Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UCI Health - Orange | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jeffrey Yoonjae Ahn is one of 1,502 hematologists and oncologists in California
Hematology and oncology is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 207RH0003X. Dr. Ahn is board certified in hematology by the American Board of Internal Medicine. Dr. Ahn is licensed in California.
Specialties and state licenses
- Hematology and oncology, CaliforniaPrimary
Hematologists and oncologists near Dr. Ahn
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. Jeffrey Yoonjae Ahn billed Medicare for 37 services in 2024
CMS data shows 37 Medicare services from Dr. Ahn across 2 procedure codes in 2024, all of them office visits, for 34 Medicare patients. Medicare paid $6,394 for them. Every service was in an office.
Dr. Ahn compared with the California median for hematologists and oncologists, 2024
- Dr. Ahn
- California median
- Medicare services
- 37vs 93296% below
- Medicare patients
- 34vs 22585% below
Medians across 1,367 hematologists and oncologists in California with Dmand AI profiles that report each measure.
Dr. Ahn'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. Ahn?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ahn 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. Jeffrey Yoonjae Ahn treated 34 Medicare patients in 2024, average age 74
CMS counts 34 Medicare patients who saw Dr. Ahn in 2024. The largest group is 65 to 74, with 15 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 38% are also on Medicaid. Their average risk score is 2.52, 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. Ahn's median patient age at 63, with 58% women.
Dr. Ahn's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Ahn's Medicare patients by sex, 2024
- Women2368%
- Men1132%
Chronic conditions among Dr. Ahn's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis62%
- Diabetes50%
- Depression41%
- Mood disorders41%
- Anxiety38%
- Osteoporosis38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women58%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Jeffrey Yoonjae Ahn offers telehealth to Medicare patients
Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Ahn as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jeffrey Yoonjae Ahn has 5 publications on record
Dmand AI links 5 papers to Dr. Ahn, published from 2018 to 2024. Dr. Ahn's most frequent co-authors are Justin Tyler Moyers, MD, Ann Eapen and Chung-Tsen Hsueh, MD.
Dr. Ahn's papers by year, 2018 to 2024
Dr. Ahn's most frequent co-authors
Recent publications by Dr. Ahn
See who Dr. Ahn researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ahn works with, so you can find a warm path to the right hematologists and oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Jeffrey Yoonjae Ahn received $35 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Ahn from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $35.
Companies that paid Dr. Ahn the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jeffrey Yoonjae Ahn graduated from Medical College of Georgia
Dr. Ahn graduated from Medical College of Georgia in 2017. Dr. Ahn is a member of AOA, ASCO and ASH.
- Medical school
- Board certified in hematology
- Board certified in internal medicine
- Board certified in medical oncology
Source: Dmand AI Professional Profile Data
Dr. Jeffrey Yoonjae Ahn accepts plans from 5 insurance carriers
Dr. Ahn is in network with 5 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Blue Cross Blue Shield of Massachusetts
- Regence Health Plans
- CMS Medicare
Plan types Dr. Ahn accepts, by number of carriers
- Medicare5
- PPO4
- HMO2
- POS2
- EPO1
Source: Dmand AI Insurance Network Data
Sources for Dr. Jeffrey Yoonjae Ahn'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Jeffrey Yoonjae Ahn
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. Jeffrey Yoonjae Ahn's NPI number?
Dr. Jeffrey Yoonjae Ahn's NPI number is 1902331630. It was assigned on May 1, 2017, and it is active in the NPI Registry.
What kind of doctor is Dr. Jeffrey Yoonjae Ahn?
Dr. Jeffrey Yoonjae Ahn is a hematologist and oncologist in Orange, California. The primary specialty in the NPI Registry is Hematology & Oncology Physician (taxonomy code 207RH0003X).
Where does Dr. Jeffrey Yoonjae Ahn practice?
Dr. Ahn practices at 101 City Drive South, Orange, CA 92868. Dr. Ahn's primary practice is UCI Health - Orange in Orange, California, part of UC Irvine. Dmand AI also links Dr. Ahn to 1 medical group.
What is Dr. Jeffrey Yoonjae Ahn's office phone number?
The practice phone on file for Dr. Ahn is (714) 456-7890.
What is Dr. Jeffrey Yoonjae Ahn's medical license number?
Dr. Ahn holds California license A159137.
Which hospitals is Dr. Jeffrey Yoonjae Ahn affiliated with?
Dr. Ahn practices at UCI Health - Orange in Orange, California.
What medical group is Dr. Jeffrey Yoonjae Ahn part of?
Dr. Ahn is linked to UCI Health Physicians. Dmand AI links Dr. Ahn to 1 more medical group.
Does Dr. Jeffrey Yoonjae Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 37 services in 2024, and Dr. Ahn accepts Medicare assignment.
Does Dr. Jeffrey Yoonjae Ahn offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Ahn as offering telehealth services.
How many Medicare patients does Dr. Jeffrey Yoonjae Ahn see?
CMS counts 34 Medicare patients who saw Dr. Ahn in 2024, with an average age of 74.
Show 8 more questionsShow fewer questions
Is Dr. Jeffrey Yoonjae Ahn board certified?
Yes. Dr. Ahn is board certified in hematology by the American Board of Internal Medicine.
What services does Dr. Jeffrey Yoonjae Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were office visit, new patient (99205) and office visit, established patient (99215).
Where did Dr. Jeffrey Yoonjae Ahn go to medical school?
Dr. Ahn graduated from Medical College of Georgia in 2017.
Has Dr. Jeffrey Yoonjae Ahn received payments from drug or device companies?
CMS Open Payments shows $35 in general payments to Dr. Ahn from 1 company from 2025 to 2025. The largest total came from Pfizer Inc.
How long has Dr. Jeffrey Yoonjae Ahn been practicing?
Dr. Ahn graduated from medical school in 2017, 9 years ago.
Does Dr. Jeffrey Yoonjae Ahn do research?
Dmand AI links 5 publications to Dr. Ahn, published from 2018 to 2024.
Who does Dr. Jeffrey Yoonjae Ahn publish with?
Dr. Ahn's most frequent co-authors are Justin Tyler Moyers, MD (2 shared papers), Ann Eapen (1 shared paper) and Chung-Tsen Hsueh, MD (1 shared paper).
What insurance does Dr. Jeffrey Yoonjae Ahn accept?
Dr. Ahn is in network with 5 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 5. Check the plan with the practice before a visit.
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