Robert James Wielenga, M.D.
Family Medicine Physician · Downey, CA
Robert James Wielenga, M.D. is a family medicine physician with a practice address in Downey, California, and NPI 1952469850, issued on Dec 4, 2006. Check the license (California G81044, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert James Wielenga
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- G81044 CA
Self-reported in NPPES; status is on the state search - Practice location
- 10835 New St, Downey, CA 90241
- Phone
- (562) 923-9100
- Enumerated
- Dec 4, 2006
- Record last updated
- Feb 26, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (562) 923-9103
- Medicare enrollment
- Enrolled (PECOS I20100917000528); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 10835 New St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vanessa Clark, PA-CMedical Physician Assistant1225588171
- Monique Denise Macasaet, NP-CFamily Nurse Practitioner1205205382
Verify Robert James Wielenga in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G81044Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7.7 times the Medicare Part D claims of the average family medicine physician in 2024
27,361 Medicare Part D claims for 1,369 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims. 304 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,337 claims
- Amlodipine Besylate1,022 claims
- Losartan Potassium981 claims
- Levothyroxine Sodium920 claims
- Rosuvastatin Calcium648 claims
- Metformin Hcl645 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: $1,650.61
90 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 55,478 providers of this specialty with any payment received $902.55 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.
Robert James Wielenga among 17,133 family medicine physician records in California
Robert James Wielenga, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1993 · median 2005 among the 10,652 with a school on file
- Record last updated2020 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
65 family medicine physician records list a practice address in Downey
They are 65 of the 3,607 NPPES records with a practice address in Downey, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Downey → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Matthew Blazon Yee, DODowney, CA 902411710043328
- Sherie Carnegie, D ODowney, CA 902411821013772
- Simon Chang, M.D.Downey, CA 902411760594097
- Andrew Chao, D.O.Downey, CA 902411780621755
- Thilan Fernando, M.D.Downey, CA 902411316146632
- Ole Heggeness, D.O.Downey, CA 902411518911908
- Ragaa Iskarous, M.D.Downey, CA 902411215035274
- Antonio Morquecho, PADowney, CA 902411417173220
Common questions
What is Robert James Wielenga, M.D.'s NPI number?
Robert James Wielenga, M.D.'s National Provider Identifier (NPI) is 1952469850, issued on Dec 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert James Wielenga, M.D. located?
The NPPES record lists a practice address at 10835 New St, Downey, CA, 90241. Phone: (562) 923-9100. Providers update this record themselves, so call before visiting.
How can I verify Robert James Wielenga, M.D.'s license?
NPPES lists California license number G81044, 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 Robert James Wielenga, M.D. prescribe under Medicare Part D?
In 2024, Robert James Wielenga, M.D. had 27,361 Medicare Part D claims for 1,369 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.