Gene Mizumoto, M.D.
NPI 1538188594 · Hospitalist Physician · Newport Beach, CA
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gene Mizumoto, M.D. is a Hospitalist Physician provider in Newport Beach, CA (NPI 1538188594).
Provider details
- NPI number
- 1538188594
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G69566 (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
850 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 456 | $120 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 161 | $117 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 124 | $175 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 55 | $80 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 31 | $50 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 18 | 17 |
| Atorvastatin Calcium | 17 | 15 |
| Pantoprazole Sodium | 15 | — |
| Omeprazole | 13 | — |
| Cefuroxime Axetilbrand: Cefuroxime | 12 | 12 |
| Methylprednisolone | 12 | 12 |
| Amlodipine Besylate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-19
- Last updated
- 2022-07-21
Frequently asked questions
- What is Gene Mizumoto's NPI number?
- Gene Mizumoto's National Provider Identifier (NPI) is 1538188594, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gene Mizumoto's specialty?
- Gene Mizumoto is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Gene Mizumoto located?
- Gene Mizumoto's practice location on file with NPPES is 1 Hoag Dr, Newport Beach, CA 92663-4162.
- What is Gene Mizumoto's phone number?
- The practice phone number listed in the NPPES registry for Gene Mizumoto is (949) 610-7245.
- Does Gene Mizumoto accept Medicare?
- Gene Mizumoto is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gene Mizumoto's NPI active?
- Yes — Gene Mizumoto's NPI (1538188594) is active in the NPPES registry as of the last update on 2022-07-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.