Duke Ahn, M.D.
Orthopaedic Surgery Physician · Los Alamitos, CA
Duke Ahn, M.D. is an orthopaedic surgery physician with a practice address in Los Alamitos, California, and NPI 1942318373, issued on Aug 27, 2006. Check the license (California G84554, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Duke Ahn
- Credential
- M.D.
- Primary taxonomy
- Orthopaedic Surgery Physician 207X00000X
- License number
- G84554 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3700 Katella Ave Ste C, Los Alamitos, CA 90720
- Phone
- (562) 583-2250
- Enumerated
- Aug 27, 2006
- Record last updated
- Jun 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (562) 583-2254
- Medicaid ID
- 00G845540 CA
- Medicare enrollment
- Enrolled (PECOS I20050420001017); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1990
- Entity
- Type 1 · individual
8 nearest orthopaedic surgery physician records → All 2,276 in California → Look up another NPI →
Verify Duke Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G84554Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
36% fewer Medicare Part D claims than the average orthopaedic surgery physician in 2024
221 Medicare Part D claims for 93 beneficiaries, against an average of 346 among the 16,516 providers of this specialty who prescribed in Part D. 148 claims were for opioids.
Most prescribed
- Hydrocodone-Acetaminophen109 claims
- Acetaminophen-Codeine24 claims
- Ibuprofen13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $61.32
2 payments; by number, the most common kind was food and beverage; the largest payer was Stryker Corporation. The 15,003 providers of this specialty with any payment received $23,022.89 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Prohealth Partners, A Medical GroupLos Alamitos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Duke Ahn among 2,276 orthopaedic surgery physician records in California
Duke Ahn, M.D. is one of 2,276 orthopaedic surgery physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1990 · median 2003 among the 1,347 with a school on file
- Record last updated2020 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207X00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
11 orthopaedic surgery physician records list a practice address in Los Alamitos
They are 11 of the 1,035 NPPES records with a practice address in Los Alamitos, and 2,276 orthopaedic surgery physician records in California.
All 2,276 in California → Every provider in Los Alamitos → Orthopaedic Surgery Physician nationwide →
The 8 orthopaedic surgery physician records with the nearest ZIP codes
- Joseph Alban, M.D.Los Alamitos, CA 907201194161844
- Lawrence Feiwell, M.D.Los Alamitos, CA 907201932201787
- Andrew Hanflik, MDLos Alamitos, CA 907201508008178
- Laura Hatch, M.D.Los Alamitos, CA 907201568808210
- Raymond Klug, M.D.Los Alamitos, CA 907201295829083
- Diana Lau, M.D.Los Alamitos, CA 907201669600011
- Tomoji Mizuguchi, M.D.Los Alamitos, CA 907201710198627
- Perry Secor, MDLos Alamitos, CA 907201548237795
Common questions
What is Duke Ahn, M.D.'s NPI number?
Duke Ahn, M.D.'s National Provider Identifier (NPI) is 1942318373, issued on Aug 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Duke Ahn, M.D. located?
The NPPES record lists a practice address at 3700 Katella Ave Ste C, Los Alamitos, CA, 90720. Phone: (562) 583-2250. Providers update this record themselves, so call before visiting.
How can I verify Duke Ahn, M.D.'s license?
NPPES lists California license number G84554, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Duke Ahn, M.D. prescribe under Medicare Part D?
In 2024, Duke Ahn, M.D. had 221 Medicare Part D claims for 93 beneficiaries; the average among orthopaedic surgery physician prescribers was 346. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.