Curtis W. Siu, MD
Internal Medicine Physician · Laguna Hills, CA
Curtis W. Siu, MD is an internal medicine physician with a practice address in Laguna Hills, California, and NPI 1386613081, issued on Mar 15, 2006. Check the license (California A74829, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Curtis W. Siu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A74829 CA
Self-reported in NPPES; status is on the state search - Practice location
- 23521 Paseo DE Valencia Ste 108, Laguna Hills, CA 92653
- Phone
- (949) 872-5227
- Enumerated
- Mar 15, 2006
- Record last updated
- Apr 29, 2026
- Fax
- (949) 588-2167
- Medicare enrollment
- Enrolled (PECOS I20050224000422); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1999
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 23521 Paseo DE Valencia Ste 108
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hadi Mansoury, M.D.Nephrology Physician1922175413
Verify Curtis W. Siu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A74829Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average internal medicine physician in 2024
6,562 Medicare Part D claims for 458 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 35 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium452 claims
- Levothyroxine Sodium402 claims
- Amlodipine Besylate366 claims
- Losartan Potassium328 claims
- Atorvastatin Calcium321 claims
- Metformin Hcl258 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.
The MIPS final score for 2023 (Medicare payment program): 74.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $54.37
2 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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 2 group practices
- Healthcare Partners Affiliates Medical GroupLaguna Hills, CA
- Saddleback Medical Group IncLaguna Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Curtis W. Siu among 17,696 internal medicine physician records in California
Curtis W. Siu, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1999 · median 2004 among the 11,065 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
56 internal medicine physician records list a practice address in Laguna Hills
They are 56 of the 2,069 NPPES records with a practice address in Laguna Hills, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Laguna Hills → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Humberto Boccardo, M.D.Laguna Hills, CA 926531689679458
- Arthur Daigneault, MDLaguna Hills, CA 926531609845361
- Raymond Fernandez, MDLaguna Hills, CA 926531629039532
- Ali Ghazvini, M.D.Laguna Hills, CA 926531104865153
- Brian HenryLaguna Hills, CA 926531629047824
- Robert Lazatin, M.D.Laguna Hills, CA 926531700865755
- Alan Lo, MDLaguna Hills, CA 926531982683637
- Lawrence Luppi, M.D.Laguna Hills, CA 926531952356727
Common questions
What is Curtis W. Siu, MD's NPI number?
Curtis W. Siu, MD's National Provider Identifier (NPI) is 1386613081, issued on Mar 15, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Curtis W. Siu, MD located?
The NPPES record lists a practice address at 23521 Paseo DE Valencia Ste 108, Laguna Hills, CA, 92653. Phone: (949) 872-5227. Providers update this record themselves, so call before visiting.
How can I verify Curtis W. Siu, MD's license?
NPPES lists California license number A74829, 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 Curtis W. Siu, MD prescribe under Medicare Part D?
In 2024, Curtis W. Siu, MD had 6,562 Medicare Part D claims for 458 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Curtis W. Siu, MD's MIPS final score?
The 2023 MIPS final score is 74.6 of 100. The average among 454,083 clinicians with a measured score was 83.5.
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.