MARK GEOFFERY STEIN (M.D.) – Diagnostic Radiology Physician, NPI 1265478564
Diagnostic Radiology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,793 DIAGNOSTIC RADIOLOGY in CA
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Provider Addresses for MARK GEOFFERY STEIN (M.D.)
North Tustin Avenue, Santa Ana, Orange County, California, 92705, United States
BLDG. A
SANTA ANA, CA 927053509
Phone: (714) 835-6055
Fax: (714) 285-9084
Mailing address matches the actual address.
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
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Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2005-05-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20050503001349 | I | Diagnostic Radiology | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| Q9967 | Low osmolar contrast material, 300-399 mg/ml iodine concentration, per ml | 4,087 | 49 | $0 |
| 71250 | Ct scan of chest without contrast | 205 | 200 | $0 |
| 71260 | Ct scan of chest with contrast | 101 | 96 | $0 |
| 71046 | X-ray of chest, 2 views | 77 | 75 | $0 |
| A9552 | Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 61 | 56 | $0 |
Insurance plans in this area (ZIP 92705)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| DIAGNOSTIC RADIOLOGY | CA | 71250 | CT scan chest | 180 | 164 |
| DIAGNOSTIC RADIOLOGY | CA | 73110 | X-ray of wrist, minimum of 3 views | 13 | 13 |
| DIAGNOSTIC RADIOLOGY | CA | 73630 | X-ray of foot, minimum of 3 views | 36 | 26 |
| DIAGNOSTIC RADIOLOGY | CA | 74177 | CT scan of abdomen and pelvis with contrast | 44 | 41 |
| DIAGNOSTIC RADIOLOGY | CA | 78815 | Nuclear medicine study with CT imaging skull base to mid-thigh | 32 | 30 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Vascular Surgery, Cardiovascular Disease (Cardiology) | CA | |
| Diagnostic Radiology | CT | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | OH | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CO | |
| - | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA | |
| Diagnostic Radiology | CA |
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