Ralph Marcus
NPI 1346566056 · Diagnostic Radiology Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Marcus is a Diagnostic Radiology Physician provider in Irvine, CA (NPI 1346566056).
Provider details
- NPI number
- 1346566056
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- Yes
- License
- A139091 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
2,923 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 802 | $9 |
| Ct Scan Head Or Brain Without Contrast70450 | 332 | $41 |
| Ct Scan of Abdomen and Pelvis Without Contrast74176 | 197 | $85 |
| Use of a Drug to Induce Depression of Consciousness By Physician Performing a Procedure (5 Years Or Older), Initial 15 Minutes99152 | 150 | $12 |
| X-Ray of Abdomen, 1 View74018 | 89 | $9 |
| Ct Scan of Chest Without Contrast71250 | 67 | $52 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-04-20
- Last updated
- 2025-06-19
- Certified
- 2025-06-19
Frequently asked questions
- What is Ralph Marcus's NPI number?
- Ralph Marcus's National Provider Identifier (NPI) is 1346566056, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Marcus's specialty?
- Ralph Marcus is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Marcus located?
- Ralph Marcus's practice location on file with NPPES is 7 Aberdeen St, Irvine, CA 92620-3302.
- What is Ralph Marcus's phone number?
- The practice phone number listed in the NPPES registry for Ralph Marcus is (949) 302-1362.
- Does Ralph Marcus accept Medicare?
- Ralph Marcus is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Marcus's NPI active?
- Yes — Ralph Marcus's NPI (1346566056) is active in the NPPES registry as of the last update on 2025-06-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.