Michael Steven Ritter, M.D.
Emergency Medicine Physician · Mission Viejo, CA
Michael Steven Ritter, M.D. is an emergency medicine physician with a practice address in Mission Viejo, California, and NPI 1295769156, issued on Jul 10, 2006. Check the license (California G74723, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Michael Steven Ritter
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- G74723 CA
Self-reported in NPPES; status is on the state search - Practice location
- 27700 Medical Center RD, Mission Viejo, CA 92691
- Phone
- (949) 364-1400
- Enumerated
- Jul 10, 2006
- Record last updated
- Jun 27, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (949) 365-4941
- Medicaid ID
- 00G747230 CA
- Medicare enrollment
- Enrolled (PECOS I20050729000455); accepts Medicare assignment
- Medical or professional school
- University Of California, Irvine, California College Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 27700 Medical Center RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ali Al-HilfiPharmacist1427948769
- Mehdi Amiri, PHARM. D.Pharmacist1528586799
- Ivan Babin, M.D.Vascular & Interventional Radiology Physician1134461486
- Danniella BermanPhysician Assistant1740849363
- Michael Blumenfeld, M.D.Anatomic Pathology & Clinical Pathology Physician1578679882
- Emily Brady, MD, MPHAnesthesiology Physician1801107669
Verify Michael Steven Ritter in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G74723Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average emergency medicine physician in 2024
48 Medicare Part D claims for 31 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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.
Bills Medicare through one group practice
- Mission Viejo Emergency Medical AssociatesMission Viejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Steven Ritter among 7,751 emergency medicine physician records in California
Michael Steven Ritter, M.D. is one of 7,751 emergency 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1991 · median 2011 among the 4,560 with a school on file
- Record last updated2008 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Mission Viejo → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Mohammad Al-Sayyad, MDMission Viejo, CA 926911538109418
- Jon Cline, M.D.Mission Viejo, CA 926911679505622
- Peter Czuleger, M.D.Mission Viejo, CA 926911043265580
- Ramon Johnson, M.D.Mission Viejo, CA 926911861426629
- Matthew Kaplan, M.D.Mission Viejo, CA 926911518991322
- James Keany, M.D.Mission Viejo, CA 926911598799330
- Richard Kozak, M.D.Mission Viejo, CA 926911457380107
- Gregory Lampe, M.D.Mission Viejo, CA 926911902839863
Common questions
What is Michael Steven Ritter, M.D.'s NPI number?
Michael Steven Ritter, M.D.'s National Provider Identifier (NPI) is 1295769156, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael Steven Ritter, M.D. located?
The NPPES record lists a practice address at 27700 Medical Center RD, Mission Viejo, CA, 92691. Phone: (949) 364-1400. Providers update this record themselves, so call before visiting.
How can I verify Michael Steven Ritter, M.D.'s license?
NPPES lists California license number G74723, 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 Michael Steven Ritter, M.D. prescribe under Medicare Part D?
In 2024, Michael Steven Ritter, M.D. had 48 Medicare Part D claims for 31 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.