Simon M. Ritchken, M.D.
Internal Medicine Physician · San Diego, CA
Simon M. Ritchken, M.D. is an internal medicine physician with a practice address in San Diego, California, and NPI 1255399341, issued on May 1, 2006. Check the license (California A34151, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Simon M. Ritchken
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A34151 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4282 Genesee Ave, San Diego, CA 92117
- Phone
- (858) 292-0108
- Enumerated
- May 1, 2006
- Record last updated
- Jun 29, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (858) 292-9097
- Medicare enrollment
- Enrolled (PECOS I20080326000700); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 4282 Genesee Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alison Anthony, CFNPAdult Health Nurse Practitioner1114071438
- Taylor Chute, M.S.Pediatric Occupational Therapist1003708587
- Shirley Fett, CFNPNurse Practitioner1316091622
- Brian First, M.D.Internal Medicine Physician1770531816
- Natasha Fischang, AU.D.Audiologist1477855989
- Kathleen Grichar, AU.D.Audiologist-Hearing Aid Fitter1366791691
Verify Simon M. Ritchken in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A34151Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,326 Medicare Part D claims for 302 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Omeprazole136 claims
- Pantoprazole Sodium94 claims
- Sod Sulf-Potass Sulf-Mag Sulf83 claims
- Losartan Potassium49 claims
- Atorvastatin Calcium37 claims
- Famotidine37 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): 15.3 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: $2,126.09
88 payments; by number, the most common kind was food and beverage; the largest payer was Salix Pharmaceuticals, a division of Bausch Health US, 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 one group practice
- Ritchken And First Medical GroupSan Diego, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Simon M. Ritchken among 17,696 internal medicine physician records in California
Simon M. Ritchken, M.D. 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
- Graduated1973 · median 2004 among the 11,065 with a school on file
- Record last updated2010 · 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).
961 internal medicine physician records list a practice address in San Diego
They are 961 of the 52,937 NPPES records with a practice address in San Diego, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Diego → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Genevieve Bloom, M.D.Coronado, CA 921181376537076
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Common questions
What is Simon M. Ritchken, M.D.'s NPI number?
Simon M. Ritchken, M.D.'s National Provider Identifier (NPI) is 1255399341, issued on May 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Simon M. Ritchken, M.D. located?
The NPPES record lists a practice address at 4282 Genesee Ave, San Diego, CA, 92117. Phone: (858) 292-0108. Providers update this record themselves, so call before visiting.
How can I verify Simon M. Ritchken, M.D.'s license?
NPPES lists California license number A34151, 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 Simon M. Ritchken, M.D. prescribe under Medicare Part D?
In 2024, Simon M. Ritchken, M.D. had 1,326 Medicare Part D claims for 302 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Simon M. Ritchken, M.D.'s MIPS final score?
The 2023 MIPS final score is 15.3 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.