Ronald A. Simon, M.D.
Allergy & Immunology Physician · San Diego, CA
Ronald A. Simon, M.D. is an allergy & immunology physician with a practice address in San Diego, California, and NPI 1255304622, issued on Feb 8, 2006. Check the license (California G31303, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald A. Simon
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- G31303 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3811 Valley Centre Dr, San Diego, CA 92130
- Phone
- (858) 764-9010
- Enumerated
- Feb 8, 2006
- Record last updated
- Jul 5, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicaid ID
- 00G313030 CA
- Medicare enrollment
- Enrolled (PECOS I20081208000771); accepts Medicare assignment
- Medical or professional school
- University Of Chicago, Pritzker School Of Medicine, 1974
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 3811 Valley Centre Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Salman Alsaad, MDProcedural Dermatology Physician1205090826
- Jeffrey Applestein, M.D.Internal Medicine Physician1427011212
- Dayna Arnstein Temby, M. D.Internal Medicine Physician1497718324
- Lavannya Atri, MDInternal Medicine Physician1285320754
- Gregory Babikian, M.D.Internal Medicine Physician1497719892
Verify Ronald A. Simon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G31303Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
21% fewer Medicare Part D claims than the average allergy & immunology physician in 2024
585 Medicare Part D claims for 159 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin57 claims
- Atovaquone-Proguanil Hcl33 claims
- Prednisone33 claims
- Fluticasone-Salmeterol26 claims
- Fluticasone Propionate25 claims
- Trelegy Ellipta23 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: $668.51
24 payments; by number, the most common kind was food and beverage; the largest payer was Genentech, Inc. The 2,496 providers of this specialty with any payment received $8,321.81 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
- Scripps HealthLa Jolla, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald A. Simon among 444 allergy & immunology physician records in California
Ronald A. Simon, M.D. is one of 444 allergy & immunology 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 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1974 · median 2004 among the 281 with a school on file
- Record last updated2018 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in San Diego → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Kevin Cook, M.D.San Diego, CA 921301649537432
- John Kelso, M.D.San Diego, CA 921301720066970
- Kathleen Luskin, MDSan Diego, CA 921301740690478
- Shaan Somani, MDSan Diego, CA 921301255858395
- Andrew White, M.D.San Diego, CA 921301750352761
- Katharine Woessner, M.D.San Diego, CA 921301184663650
- Ashika Odhav, MDSan Diego, CA 921311427390855
- Bryn Salt, MDSan Diego, CA 921311467549345
Common questions
What is Ronald A. Simon, M.D.'s NPI number?
Ronald A. Simon, M.D.'s National Provider Identifier (NPI) is 1255304622, issued on Feb 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald A. Simon, M.D. located?
The NPPES record lists a practice address at 3811 Valley Centre Dr, San Diego, CA, 92130. Phone: (858) 764-9010. Providers update this record themselves, so call before visiting.
How can I verify Ronald A. Simon, M.D.'s license?
NPPES lists California license number G31303, 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 Ronald A. Simon, M.D. prescribe under Medicare Part D?
In 2024, Ronald A. Simon, M.D. had 585 Medicare Part D claims for 159 beneficiaries; the average among allergy & immunology physician prescribers was 741. 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.