James Ashizawa, MD
NPI 1588654123 · Family Medicine Physician · San Juan Capistrano, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Ashizawa, MD is a Family Medicine Physician provider in San Juan Capistrano, CA (NPI 1588654123).
Provider details
- NPI number
- 1588654123
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A41984 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
546 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 183 | $6 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 151 | $98 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 93 | $80 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 45 | $17 |
| Administration of Influenza Virus VaccineG0008 | 30 | $35 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 139 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 391 | 130 |
| Amlodipine Besylate | 308 | 94 |
| Rosuvastatin Calcium | 302 | 110 |
| Levothyroxine Sodium | 275 | 79 |
| Losartan Potassium | 207 | 70 |
| Metformin Hclbrand: Metformin Hcl Er | 180 | 56 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$79 across 3 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-10-25
- Last updated
- 2015-07-08
Frequently asked questions
- What is James Ashizawa's NPI number?
- James Ashizawa's National Provider Identifier (NPI) is 1588654123, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Ashizawa's specialty?
- James Ashizawa is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is James Ashizawa located?
- James Ashizawa's practice location on file with NPPES is 31001 Rancho Viejo Rd, San Juan Capistrano, CA 92675.
- What is James Ashizawa's phone number?
- The practice phone number listed in the NPPES registry for James Ashizawa is (949) 661-9611.
- Does James Ashizawa accept Medicare?
- James Ashizawa is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Ashizawa's NPI active?
- Yes — James Ashizawa's NPI (1588654123) is active in the NPPES registry as of the last update on 2015-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.