Ellyn Ashida, MD
Allergy & Immunology Physician · Torrance, CA
Ellyn Ashida, MD is an allergy & immunology physician with a practice address in Torrance, California, and NPI 1245201516, issued on Jan 27, 2006. Check the license (California C40034, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ellyn Ashida
- Credential
- MD
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- C40034 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4201 Torrance Blvd, Torrance, CA 90503
- Phone
- (310) 944-9098
- Enumerated
- Jan 27, 2006
- Record last updated
- Feb 21, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 00C400340 CA
- Medicare enrollment
- Enrolled (PECOS I20100916000089); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1979
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Also registered at 4201 Torrance Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ellyn Ashida in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C40034Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
20% more Medicare Part D claims than the average allergy & immunology physician in 2024
887 Medicare Part D claims for 179 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 36% of claims.
Most prescribed
- Montelukast Sodium97 claims
- Fluticasone Propionate75 claims
- Azelastine Hcl74 claims
- Albuterol Sulfate Hfa63 claims
- Xolair49 claims
- Levocetirizine Dihydrochloride46 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.
Industry payments in 2024: $521.76
28 payments; by number, the most common kind was food and beverage; the largest payer was Genzyme Corporation. The 2,496 providers of this specialty with any payment received $8,321.81 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Ellyn Ashida among 444 allergy & immunology physician records in California
Ellyn Ashida, MD is one of 444 allergy & immunology physician records with a practice address in California. 79% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1979 · median 2004 among the 281 with a school on file
- Record last updated2020 · 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 207K00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Allergy & Immunology Physician providers in California
There are 444 allergy & immunology physician records in California.
All 444 in California → Every provider in Torrance → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Edward Buchsbaum, MDTorrance, CA 905031376648170
- Heather Volpp, M.D.Torrance, CA 905031083702120
- Dean Chiang, M.D.Torrance, CA 905051760484455
- Stephen Grifka, M.D.Torrance, CA 905051902089006
- Yana Kryvokhyzha, DOTorrance, CA 905051548753312
- Connie Lin, M.D.Torrance, CA 905051760825590
- Allan Singer, M.D.Torrance, CA 905051417951070
- Eric YenTorrance, CA 905051447464375
Common questions
What is Ellyn Ashida, MD's NPI number?
Ellyn Ashida, MD's National Provider Identifier (NPI) is 1245201516, issued on Jan 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ellyn Ashida, MD located?
The NPPES record lists a practice address at 4201 Torrance Blvd, Torrance, CA, 90503. Phone: (310) 944-9098. Providers update this record themselves, so call before visiting.
How can I verify Ellyn Ashida, MD's license?
NPPES lists California license number C40034, 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 Ellyn Ashida, MD prescribe under Medicare Part D?
In 2024, Ellyn Ashida, MD had 887 Medicare Part D claims for 179 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
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.