Mariko Ishimori, M.D.
NPI 1487606695 · Rheumatology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariko Ishimori, M.D. is a Rheumatology Physician provider in Los Angeles, CA (NPI 1487606695).
Provider details
- NPI number
- 1487606695
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A79050 (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
20 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
202 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 107 | $104 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 82 | $70 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 13 | $142 |
Typical Medicare-allowed amounts for these services range $70–$142 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Hydroxychloroquine Sulfate | 69 | 19 |
| Etanerceptbrand: Enbrel Sureclick | 62 | — |
| Methotrexate Sodiumbrand: Methotrexate | 57 | 14 |
| Prednisone | 37 | 14 |
| Gabapentin | 30 | — |
| Adalimumabbrand: Humira(cf) Pen | 28 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-16
- Last updated
- 2014-08-06
Frequently asked questions
- What is Mariko Ishimori's NPI number?
- Mariko Ishimori's National Provider Identifier (NPI) is 1487606695, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariko Ishimori's specialty?
- Mariko Ishimori is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mariko Ishimori located?
- Mariko Ishimori's practice location on file with NPPES is 8700 Beverly Blvd., Los Angeles, CA 90048-1865.
- What is Mariko Ishimori's phone number?
- The practice phone number listed in the NPPES registry for Mariko Ishimori is (310) 423-2170.
- Does Mariko Ishimori accept Medicare?
- Mariko Ishimori is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariko Ishimori's NPI active?
- Yes — Mariko Ishimori's NPI (1487606695) is active in the NPPES registry as of the last update on 2014-08-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.