Mark Nishiki, MD
NPI 1457385890 · Anatomic Pathology & Clinical Pathology Physician · Stockton, CA
Enrolled with Medicare as Practitioner - Pathology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nishiki, MD is a Anatomic Pathology & Clinical Pathology Physician provider in Stockton, CA (NPI 1457385890).
Provider details
- NPI number
- 1457385890
- Entity type
- Individual
- Primary specialty
- Anatomic Pathology & Clinical Pathology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G56041 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 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
1,110 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) |
|---|---|---|
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 351 | $37 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 304 | $75 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 92 | $26 |
| Pathology Examination of Tissue Using a Microscope, Limited Examination88300 | 70 | $4 |
| Special Stained Specimen Slides to Examine Tissue, Each Additional Procedure88341 | 67 | $28 |
| Special Stained Specimen Slides to Identify Organisms Including Interpretation and Report88312 | 50 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-10
- Last updated
- 2024-04-03
- Certified
- 2024-04-03
Frequently asked questions
- What is Mark Nishiki's NPI number?
- Mark Nishiki's National Provider Identifier (NPI) is 1457385890, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nishiki's specialty?
- Mark Nishiki is listed in the NPPES registry with a primary specialty of Anatomic Pathology & Clinical Pathology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nishiki located?
- Mark Nishiki's practice location on file with NPPES is 1800 N California St, Stockton, CA 95204-6019.
- What is Mark Nishiki's phone number?
- The practice phone number listed in the NPPES registry for Mark Nishiki is (209) 943-2000.
- Does Mark Nishiki accept Medicare?
- Mark Nishiki is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nishiki's NPI active?
- Yes — Mark Nishiki's NPI (1457385890) is active in the NPPES registry as of the last update on 2024-04-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.