Mariko Ishimori, M.D.
Rheumatology Physician · Los Angeles, CA
Mariko Ishimori, M.D. is a rheumatology physician with a practice address in Los Angeles, California, and NPI 1487606695, issued on May 16, 2006. Check the license (California A79050, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mariko Ishimori
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A79050 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8700 Beverly Blvd., Los Angeles, CA 90048
- Phone
- (310) 423-2170
- Enumerated
- May 16, 2006
- Record last updated
- Aug 6, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (310) 423-6898
- Medicare enrollment
- Enrolled (PECOS I20060804000174); accepts Medicare assignment
- Medical or professional school
- New York Medical College, 2000
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 8700 Beverly Blvd.
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Marie Acorda Reece, NPAdult Health Nurse Practitioner1528331485
- Songolaye Akinloye, P.A.Surgical Physician Assistant1487781043
- Arie Alkalay, M.D.Specialist1265419154
- Alexander Allins, M.D.Specialist1033193016
- Harold Amer, M.D.Pediatrics Physician1447237359
- David Balfe, M.D.Pulmonary Disease Physician1265410146
Verify Mariko Ishimori in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A79050Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average rheumatology physician in 2024
718 Medicare Part D claims for 86 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of claims.
Most prescribed
- Hydroxychloroquine Sulfate69 claims
- Enbrel Sureclick62 claims
- Methotrexate57 claims
- Prednisone37 claims
- Gabapentin30 claims
- Humira(Cf) Pen28 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 87.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
2 hospitals and group practices
- Cedars-Sinai Medical CenterWest Hollywood, CA · Acute Care Hospitals5 of 5 stars
- Venice Family ClinicVenice, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Mariko Ishimori among 926 rheumatology physician records in California
Mariko Ishimori, M.D. is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2000 · median 2003 among the 641 with a school on file
- Record last updated2014 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Los Angeles → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Francesco Boin, M.D.West Hollywood, CA 900481417908229
- Lindsy Forbess, MDLos Angeles, CA 900481972764116
- Elizabeth Frame, M.D.West Hollywood, CA 900481912094434
- Elayne Garber, MDLos Angeles, CA 900481508960840
- Jon Giles, M.D.Los Angeles, CA 900481679511810
- Arash Horizon, M.D.Los Angeles, CA 900481881694131
- Judy Maddox, DOWest Hollywood, CA 900481235349671
- Katherine Neumann, MDLos Angeles, CA 900481467536102
Common questions
What is Mariko Ishimori, M.D.'s NPI number?
Mariko Ishimori, M.D.'s National Provider Identifier (NPI) is 1487606695, issued on May 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mariko Ishimori, M.D. located?
The NPPES record lists a practice address at 8700 Beverly Blvd., Los Angeles, CA, 90048. Phone: (310) 423-2170. Providers update this record themselves, so call before visiting.
How can I verify Mariko Ishimori, M.D.'s license?
NPPES lists California license number A79050, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mariko Ishimori, M.D. prescribe under Medicare Part D?
In 2024, Mariko Ishimori, M.D. had 718 Medicare Part D claims for 86 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Mariko Ishimori, M.D.'s MIPS final score?
The 2023 MIPS final score is 87.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.