Mark Shiroishi, M.D.
NPI 1699949875 · Neuroradiology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Shiroishi, M.D. is a Neuroradiology Physician provider in Los Angeles, CA (NPI 1699949875).
Provider details
- NPI number
- 1699949875
- Entity type
- Individual
- Primary specialty
- Neuroradiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A84958 (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
18 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
285 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) |
|---|---|---|
| Ct Scan Head Or Brain Without Contrast70450 | 88 | $41 |
| Mri Scan of Brain Before and After Contrast70553 | 80 | $111 |
| Mri Scan of Brain Without Contrast70551 | 27 | $72 |
| Ct Scan of Blood Vessels of Head With Contrast70496 | 20 | $85 |
| Ct Scan of Blood Vessels of Neck With Contrast70498 | 15 | $82 |
| Mri Scan of Blood Vessels of Head Without Contrast70544 | 15 | $59 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-04-17
- Last updated
- 2023-11-27
- Certified
- 2020-10-09
Frequently asked questions
- What is Mark Shiroishi's NPI number?
- Mark Shiroishi's National Provider Identifier (NPI) is 1699949875, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Shiroishi's specialty?
- Mark Shiroishi is listed in the NPPES registry with a primary specialty of Neuroradiology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Shiroishi located?
- Mark Shiroishi's practice location on file with NPPES is 1500 San Pablo St Fl 2, Los Angeles, CA 90033-5313.
- What is Mark Shiroishi's phone number?
- The practice phone number listed in the NPPES registry for Mark Shiroishi is (323) 442-8541.
- Does Mark Shiroishi accept Medicare?
- Mark Shiroishi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Shiroishi's NPI active?
- Yes — Mark Shiroishi's NPI (1699949875) is active in the NPPES registry as of the last update on 2023-11-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.