Woo Sung Ahn, MD
Internal Medicine Physician · Lakewood, CA
Woo Sung Ahn, MD is an internal medicine physician with a practice address in Lakewood, California, and NPI 1396807806, issued on Dec 14, 2006. Check the license (California A51408, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Woo Sung Ahn
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A51408 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20145 S Pioneer Blvd, Lakewood, CA 90715
- Phone
- (562) 916-5020
- Enumerated
- Dec 14, 2006
- Entity
- Type 1 · individual
Verify Woo Sung Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A51408Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
5.8 times the Medicare Part D claims of the average internal medicine physician in 2024
16,144 Medicare Part D claims for 669 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 63 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium1,160 claims
- Atorvastatin Calcium821 claims
- Losartan-Hydrochlorothiazide800 claims
- Amlodipine Besylate732 claims
- Vascepa588 claims
- Metformin Hcl Er580 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: $793.37
39 payments, mostly food and beverage; the largest payer was Novo Nordisk Inc. The 65,274 providers of this specialty with any payment received $2,536.66 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.
30 internal medicine physician records list a Lakewood practice address
They are 30 of the 1,204 NPPES records with a Lakewood practice address, and 20,403 internal medicine physician records in California.
All 30 in Lakewood → All 20,403 in California → Every provider in Lakewood →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Woo Sung Ahn, MD's NPI number?
Woo Sung Ahn, MD's National Provider Identifier (NPI) is 1396807806, issued on Dec 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Woo Sung Ahn, MD located?
The NPPES record lists a practice address at 20145 S Pioneer Blvd, Lakewood, CA, 90715. Phone: (562) 916-5020. Providers update this record themselves, so call before visiting.
How can I verify Woo Sung Ahn, MD's license?
NPPES lists California license number A51408, 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 Woo Sung Ahn, MD prescribe under Medicare Part D?
In 2024, Woo Sung Ahn, MD had 16,144 Medicare Part D claims for 669 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.