Dr. Jonathon Jin-Sung Ahn, MD
- Medicare services, 2024
- 72
- Medicare patients, 2024
- 170
- Hospital affiliations
- 2
- Industry payments
- $174
- Medical group
- 1
- Practice address
- 101 E. Valencia Mesa Drive, Fullerton, CA 92835
- Practice phone
- Call (714) 578-8706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
St. Jude Medical Center - Unit
Acute Care Hospital-Unit · Fullerton, California
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. Jonathon Jin-Sung Ahn is an anesthesiologist in Fullerton, California
Dr. Ahn practices at St. Jude Medical Center - Unit in Fullerton, California.
Dr. Ahn's NPI, 1053803882, was assigned on June 6, 2018. Dr. Ahn graduated from Loma Linda University School Of Medicine in 2018. Dr. Ahn's California license number on file is A164226.
- NPI
- 1053803882NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0840658506
- NPI enumeration date
- June 6, 2018
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (714) 578-8706
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 34
- Medical school graduation
- 2018
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jonathon Jin-Sung Ahn practices at St. Jude Medical Center - Unit in Fullerton, California
Dr. Ahn's primary practice is St. Jude Medical Center - Unit, at 101 E. Valencia Mesa Drive, Fullerton, CA 92835 in Orange County. The practice phone is (714) 578-8706.
- St. Jude Medical Center - Unit101 E. Valencia Mesa Drive, Fullerton, CA 92835 · Orange CountyPhone(714) 578-8706
Source: Dmand AI Affiliation Data
Dr. Jonathon Jin-Sung Ahn is affiliated with 2 sites of care and 1 medical group
Dr. Ahn's primary practice is St. Jude Medical Center - Unit in Fullerton, California. Dr. Ahn is also affiliated with Providence St. Jude Medical Center. The medical group on file is Allied Anesthesia Medical Group.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Jonathon Jin-Sung Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| St. Jude Medical Center - Unit | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jonathon Jin-Sung Ahn is one of 6,593 anesthesiologists in California
Anesthesiology is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dr. Ahn is board certified in anesthesiology by the American Board of Anesthesiology. Dr. Ahn has a license on file in California.
Specialties and state licenses
- Anesthesiology, CaliforniaPrimary
Anesthesiologists near Dr. Ahn
Counts of anesthesiologists 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. Jonathon Jin-Sung Ahn billed Medicare for 72 services in 2024
CMS data shows 72 Medicare services from Dr. Ahn across 5 procedure codes in 2024, for 170 Medicare patients. Medicare paid $4,727 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Ahn's Medicare services by type, 2024
- Anesthesia33
- Surgery25
- Imaging14
Dr. Ahn compared with the California median for anesthesiologists, 2024
- Dr. Ahn
- California median
- Medicare services
- 72vs 72Close to median
- Medicare patients
- 170vs 14319% above
Medians across 5,562 anesthesiologists 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 anesthesiologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonathon Jin-Sung Ahn treated 170 Medicare patients in 2024, average age 74
CMS counts 170 Medicare patients who saw Dr. Ahn in 2024. The largest group is 65 to 74, with 73 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 24% are also on Medicaid. Their average risk score is 1.74, 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 59, with 63% women.
Dr. Ahn's Medicare patients by age, 2024
Dr. Ahn's Medicare patients by sex, 2024
- Women8550%
- Men8550%
Chronic conditions among Dr. Ahn's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis58%
- Ischemic heart disease36%
- Diabetes34%
- Chronic kidney disease32%
- Atrial fibrillation28%
- Heart failure25%
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 59
Patient panel by sex, all payers
- Women63%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. Jonathon Jin-Sung Ahn takes part in Medicare
Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jonathon Jin-Sung Ahn received $174 in industry payments from 2023 to 2025
CMS Open Payments shows 2 general payments to Dr. Ahn from 2 drug and device companies from 2023 to 2025. Food and beverage make up the largest share, 100% of the total. Edwards Lifesciences Corporation paid the most, $155.
General payments to Dr. Ahn by program year, 2023 to 2025
Companies that paid Dr. Ahn the most, 2023 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jonathon Jin-Sung Ahn graduated from Loma Linda University School Of Medicine
Dr. Ahn graduated from Loma Linda University School Of Medicine in 2018.
- Medical school
- Board certified in anesthesiology
Source: Dmand AI Professional Profile Data
Dr. Jonathon Jin-Sung Ahn accepts plans from 1 insurance carrier
Dr. Ahn is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Jonathon Jin-Sung 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 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) |
| 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. Jonathon Jin-Sung Ahn
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What is Dr. Jonathon Jin-Sung Ahn's NPI number?
Dr. Jonathon Jin-Sung Ahn's NPI number is 1053803882. It was assigned on June 6, 2018, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonathon Jin-Sung Ahn?
Dr. Jonathon Jin-Sung Ahn is an anesthesiologist in Fullerton, California. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. Jonathon Jin-Sung Ahn practice?
Dr. Ahn practices at 101 E. Valencia Mesa Drive, Fullerton, CA 92835. Dr. Ahn's primary practice is St. Jude Medical Center - Unit in Fullerton, California.
What is Dr. Jonathon Jin-Sung Ahn's office phone number?
The practice phone on file for Dr. Ahn is (714) 578-8706.
What is Dr. Jonathon Jin-Sung Ahn's medical license number?
Dr. Ahn's California license number on file is A164226.
Which hospitals is Dr. Jonathon Jin-Sung Ahn affiliated with?
Dr. Ahn is affiliated with Providence St. Jude Medical Center. Dmand AI links Dr. Ahn to 1 more hospital.
What medical group is Dr. Jonathon Jin-Sung Ahn part of?
Dr. Ahn is linked to Allied Anesthesia Medical Group.
Does Dr. Jonathon Jin-Sung Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 72 services in 2024, and Dr. Ahn accepts Medicare assignment.
How many Medicare patients does Dr. Jonathon Jin-Sung Ahn see?
CMS counts 170 Medicare patients who saw Dr. Ahn in 2024, with an average age of 74.
Is Dr. Jonathon Jin-Sung Ahn board certified?
Yes. Dr. Ahn is board certified in anesthesiology by the American Board of Anesthesiology.
Show 5 more questionsShow fewer questions
What services does Dr. Jonathon Jin-Sung Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were anesthesia (00731), anesthesia (00142) and surgery: heart and blood vessels (36620).
Where did Dr. Jonathon Jin-Sung Ahn go to medical school?
Dr. Ahn graduated from Loma Linda University School Of Medicine in 2018.
Has Dr. Jonathon Jin-Sung Ahn received payments from drug or device companies?
CMS Open Payments shows $174 in general payments to Dr. Ahn from 2 companies from 2023 to 2025. The largest total came from Edwards Lifesciences Corporation.
How long has Dr. Jonathon Jin-Sung Ahn been practicing?
Dr. Ahn graduated from medical school in 2018, 8 years ago.
What insurance does Dr. Jonathon Jin-Sung Ahn accept?
Dr. Ahn is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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