Dr. Dean Ahn, MD
- Medicare patients, 2026
- 16
- Part D claims, 2026
- 364
- Hospital affiliations
- 1
- Industry payments
- $56
- Medical group
- 1
- Practice address
- 9333 Imperial Highway, Downey, CA 90242
- Practice phone
- Call (562) 461-6007
- 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
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Dr. Dean Ahn is a general surgeon in Downey, California
Dr. Ahn practices at Downey Medical Center in Downey, California, part of Kaiser Permanente.
Dr. Ahn's NPI, 1821165846, was assigned on November 29, 2006. Dr. Ahn graduated from Feinberg School of Medicine in 1990. Dr. Ahn holds California license G83801.
- NPI
- 1821165846NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3476683111
- NPI enumeration date
- November 29, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (562) 461-6007
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 62
- Medical school graduation
- 1990
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Dean Ahn practices at Downey Medical Center in Downey, California
Dr. Ahn's primary practice is Downey Medical Center, at 9333 Imperial Highway, Downey, CA 90242 in Los Angeles County. The practice phone is (562) 461-6007.
- Downey Medical Center9333 Imperial Highway, Downey, CA 90242 · Los Angeles CountyPhone(562) 461-6007
Source: Dmand AI Affiliation Data
Dr. Dean Ahn is affiliated with 3 sites of care and 1 medical group
Dr. Ahn's primary practice is Downey Medical Center in Downey, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Ahn to 1 more breast imaging center and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Dean Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Downey Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Dean Ahn is one of 2,926 general surgeons in California
Surgery is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Ahn is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Ahn's licenses on file in 2 states: California and Michigan.
Specialties and state licenses
- Surgery, CaliforniaPrimary
- Michigan license
Clinical focus
Dmand AI lists abdominal adhesion surgery and gastrointestinal obstruction among the conditions Dr. Ahn treats.
General surgeons near Dr. Ahn
Counts of general 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. Dean Ahn treated 16 Medicare patients in 2026, average age 61
CMS counts 16 Medicare patients who saw Dr. Ahn in 2026. The largest group is 85 and over, with 0 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 3.34, 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 54, with 63% women.
Dr. Ahn's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Ahn's Medicare patients, 2026
- High blood pressure75%
- High cholesterol75%
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 54
Patient panel by sex, all payers
- Women63%
- Men36%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. Dean Ahn wrote 364 Medicare Part D claims in 2026
In 2026, Dr. Ahn wrote 364 Medicare Part D claims for 115 patients. 98% of them were for generic drugs. CMS names the drug for 247 of them, across 8 drugs with 11 or more claims each, at $2,240 in total drug cost. In 2023, CMS named 217 claims across 5 drugs.
Dr. Ahn's Part D claims by kind of drug, 2026
- Generic355 claims98%
- Brand-name and other9 claims2%
Dr. Ahn'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. Ahn's Part D claims, 2026
- Opioids23%85 of 364 claims
- Antibiotics23%82 of 364 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: 2172024: 24714%
Drugs named by CMS: 8 in 2024, 5 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), 2026 data
How Dr. Dean Ahn takes part in Medicare
Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Colonoscopy: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Dean Ahn received $56 in industry payments in 2016
CMS Open Payments shows 1 general payment to Dr. Ahn from 1 drug or device company in 2016. Food and beverage make up the largest share, 100% of the total. Medtronic Vascular, Inc. paid the most, $56.
Companies that paid Dr. Ahn the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Dean Ahn graduated from Feinberg School of Medicine
Dr. Ahn graduated from Feinberg School of Medicine in 1990.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Dean 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. Dean 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 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)Doctors and Clinicians Utilization Data (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. Dean 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. Dean Ahn's NPI number?
Dr. Dean Ahn's NPI number is 1821165846. It was assigned on November 29, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Dean Ahn?
Dr. Dean Ahn is a general surgeon in Downey, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Dean Ahn practice?
Dr. Ahn practices at 9333 Imperial Highway, Downey, CA 90242. Dr. Ahn's primary practice is Downey Medical Center in Downey, California, part of Kaiser Permanente. Dmand AI also links Dr. Ahn to 1 breast imaging center and 1 group practice or clinic, and a free account names each one.
What is Dr. Dean Ahn's office phone number?
The practice phone on file for Dr. Ahn is (562) 461-6007. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. Dean Ahn's email address?
Dmand AI checks professional and personal email addresses for Dr. Ahn through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. Dean Ahn's medical license number?
Dr. Ahn holds California license G83801, one of the licenses on file in 2 states.
Which states has Dr. Dean Ahn been licensed in?
Dmand AI has state licenses on file for Dr. Ahn in California (1997 to 2027) and Michigan (1995 to 1999).
Which hospitals is Dr. Dean Ahn affiliated with?
Dr. Ahn practices at Downey Medical Center in Downey, California.
What medical group is Dr. Dean Ahn part of?
Dr. Ahn is linked to Southern California Permanente Medical Group.
Who does Dr. Dean Ahn practice with?
Dmand AI links 17,030 HCPs to Dr. Ahn's primary medical group, 280 of them general surgeons. A free account lists them, with verified contacts.
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Does Dr. Dean Ahn accept Medicare?
Yes. CMS lists Dr. Ahn as accepting Medicare assignment.
How many Medicare patients does Dr. Dean Ahn see?
CMS counts 16 Medicare patients who saw Dr. Ahn in 2026, with an average age of 61.
Is Dr. Dean Ahn board certified?
Yes. Dr. Ahn is board certified in surgery by the American Board of Surgery.
Where did Dr. Dean Ahn go to medical school?
Dr. Ahn graduated from Feinberg School of Medicine in 1990.
What drugs does Dr. Dean Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Gabapentin, Tramadol HCl and Amoxicillin-Clavulanate Potass.
Has Dr. Dean Ahn received payments from drug or device companies?
CMS Open Payments shows $56 in general payments to Dr. Ahn from 1 company from 2016 to 2016. The largest total came from Medtronic Vascular, Inc.
How long has Dr. Dean Ahn been practicing?
Dr. Ahn graduated from medical school in 1990, 36 years ago.
What EHR does Dr. Dean Ahn's practice use?
Dmand AI tracks the EHR system at Downey Medical Center and at 2 more affiliated sites. The vendor and product are available with a free Dmand AI account.
What insurance does Dr. Dean 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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