Mark Geoffery Stein, M.D.
Diagnostic Radiology Physician · Santa Ana, CA
Mark Geoffery Stein, M.D. is a diagnostic radiology physician with a practice address in Santa Ana, California, and NPI 1265478564, issued on Jun 22, 2006. Check the license (California A38805, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Geoffery Stein
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- A38805 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1100 N Tustin Ave, Santa Ana, CA 92705
- Phone
- (714) 835-6055
- Enumerated
- Jun 22, 2006
- Record last updated
- Jun 16, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (714) 285-9084
- Medicaid ID
- 00A388050 CA
- Medicare enrollment
- Enrolled (PECOS I20050503001349); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 1100 N Tustin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Michael Black, M.D.Neuroradiology Physician1780620955
- Joseph Brugman, M.D.Diagnostic Radiology Physician1790727188
- Khurshed Dastur, MDDiagnostic Radiology Physician1740287887
- Laszlo Kaveggia, M.D.Diagnostic Radiology Physician1508808924
- Patricia Kincaid, M.D.Diagnostic Radiology Physician1134163165
Verify Mark Geoffery Stein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A38805Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 91.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through 3 group practices
- Beverly Radiology Medical Group IIIToluca Lake, CA
- Desert Advanced Imaging Medical CenterRanco Mirage, CA
- UC RegentsOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Geoffery Stein among 4,500 diagnostic radiology physician records in California
Mark Geoffery Stein, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% 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, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1978 · median 2004 among the 3,130 with a school on file
- Record last updated2015 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Santa Ana → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Joseph Brugman, M.D.Santa Ana, CA 927051790727188
- Khurshed Dastur, MDSanta Ana, CA 927051740287887
- Laszlo Kaveggia, M.D.Santa Ana, CA 927051508808924
- Patricia Kincaid, M.D.Santa Ana, CA 927051134163165
- Jessica Langer, MDSanta Ana, CA 927051972893923
- Hemlata Lepkowski, MDTustin, CA 927051114038338
- Christina Ma, M.D.Santa Ana, CA 927051891052742
- Duke Nguyen, M.D.Santa Ana, CA 927051700822962
Common questions
What is Mark Geoffery Stein, M.D.'s NPI number?
Mark Geoffery Stein, M.D.'s National Provider Identifier (NPI) is 1265478564, issued on Jun 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Geoffery Stein, M.D. located?
The NPPES record lists a practice address at 1100 N Tustin Ave, Santa Ana, CA, 92705. Phone: (714) 835-6055. Providers update this record themselves, so call before visiting.
How can I verify Mark Geoffery Stein, M.D.'s license?
NPPES lists California license number A38805, 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.
What is Mark Geoffery Stein, M.D.'s MIPS final score?
The 2023 MIPS final score is 91.3 of 100, reported for the practice group. 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.