Clayton B. Dejong, MD
Internal Medicine Physician · Long Beach, CA
Clayton B. Dejong, MD is an internal medicine physician with a practice address in Long Beach, California, and NPI 1467466409, issued on Jul 27, 2006. Check the license (California A42912, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Clayton B. Dejong
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A42912 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Redondo Ave, Long Beach, CA 90814
- Phone
- (562) 433-7496
- Enumerated
- Jul 27, 2006
- Record last updated
- Dec 29, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (562) 987-9206
- Medicare enrollment
- Enrolled (PECOS I20100504000466); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1985
- 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 300 Redondo Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Judith Belman, NPNurse Practitioner1093894750
- Deborah Chow, NPNurse Practitioner1710991757
- Tyler De Jong, M.D.Internal Medicine Physician1033537493
- Stephanie Green, MDFamily Medicine Physician1427062462
- Perry Koseff, DOFamily Medicine Physician1790709186
- Lyndsay Onaga, PA-CPhysician Assistant1912770579
Verify Clayton B. Dejong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A42912Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% more Medicare Part D claims than the average internal medicine physician in 2024
5,749 Medicare Part D claims for 572 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 115 claims were for opioids.
Most prescribed
- Atorvastatin Calcium385 claims
- Lisinopril318 claims
- Amlodipine Besylate295 claims
- Levothyroxine Sodium268 claims
- Metformin Hcl188 claims
- Losartan Potassium160 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: $53.48
2 payments; by number, the most common kind was food and beverage; the largest payer was Exact Sciences Corporation. 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 one group practice
- Prohealth Partners, A Medical GroupLong Beach, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Clayton B. Dejong among 17,696 internal medicine physician records in California
Clayton B. Dejong, 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
- Graduated1985 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 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).
221 internal medicine physician records list a practice address in Long Beach
They are 221 of the 13,650 NPPES records with a practice address in Long Beach, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Long Beach → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tyler De Jong, M.D.Long Beach, CA 908141033537493
- Karen Dubowy-Karpouzas, MDLong Beach, CA 908141710035597
- Cornelia Barton, MDLong Beach, CA 908151205999265
- Diana Bryant, MDLong Beach, CA 908151255425146
- Gagik Gabrielyan, DOLong Beach, CA 908131366145021
- Thomas Hendon, M.D.Long Beach, CA 908151093745853
- Lance Hirano, MDLong Beach, CA 908151386751576
- Patrick Huong, DOLong Beach, CA 908131215787650
Common questions
What is Clayton B. Dejong, MD's NPI number?
Clayton B. Dejong, MD's National Provider Identifier (NPI) is 1467466409, issued on Jul 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Clayton B. Dejong, MD located?
The NPPES record lists a practice address at 300 Redondo Ave, Long Beach, CA, 90814. Phone: (562) 433-7496. Providers update this record themselves, so call before visiting.
How can I verify Clayton B. Dejong, MD's license?
NPPES lists California license number A42912, 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 Clayton B. Dejong, MD prescribe under Medicare Part D?
In 2024, Clayton B. Dejong, MD had 5,749 Medicare Part D claims for 572 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.