Yesim Yilmaz Demirdag, M.D.
Allergy & Immunology Physician · Irvine, CA
Yesim Yilmaz Demirdag, M.D. is an allergy & immunology physician with a practice address in Irvine, California, and NPI 1134330921, issued on May 24, 2007. Check the license (California C166841, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Yesim Yilmaz Demirdag
- Credential
- M.D.
- Primary taxonomy
- Allergy & Immunology Physician 207K00000X
- License number
- C166841 CA
Self-reported in NPPES; status is on the state search - Practice location
- 821 Health Sciences RD Medical Sciences I C-240, Irvine, CA 92697
- Phone
- (949) 824-5818
- Enumerated
- May 24, 2007
- Record last updated
- Aug 27, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicaid ID
- 07225 LA
- Medicare enrollment
- Enrolled (PECOS I20200421002761); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest allergy & immunology physician records → All 444 in California → Look up another NPI →
Verify Yesim Yilmaz Demirdag in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C166841Check 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 128 beneficiaries, against an average of 741 among the 2,899 providers of this specialty who prescribed in Part D. Brand-name drugs were 53% of claims.
Most prescribed
- Fluticasone Propionate80 claims
- Dupixent Pen60 claims
- Azelastine Hcl44 claims
- Xolair43 claims
- Ipratropium Bromide40 claims
- Gamunex-C39 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 MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $3,089.99
9 payments; by number, the most common kind was food and beverage; the largest payer was Csl Behring. 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.
Bills Medicare through one group practice
- UC RegentsOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Yesim Yilmaz Demirdag among 444 allergy & immunology physician records in California
Yesim Yilmaz Demirdag, M.D. 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 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 38% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1990 · 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 Irvine → Allergy & Immunology Physician nationwide →
The 8 allergy & immunology physician records with the nearest ZIP codes
- Sudhir Gupta, MDIrvine, CA 926971811077969
- Ankmalika Gupta, MDIrvine, CA 926971790946440
- Jenny Lee, M.D.Irvine, CA 926971083076749
- Lisa Lim, M.D.Irvine, CA 926971336334820
- Grace Rhim, MDLadera Ranch, CA 926941790829174
- Faith Huang, M.D.Mission Viejo, CA 926911326252230
- Jacquelyn HunterMission Viejo, CA 926911629639406
- Janet Kim, M.D.Mission Viejo, CA 926911235451360
Common questions
What is Yesim Yilmaz Demirdag, M.D.'s NPI number?
Yesim Yilmaz Demirdag, M.D.'s National Provider Identifier (NPI) is 1134330921, issued on May 24, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Yesim Yilmaz Demirdag, M.D. located?
The NPPES record lists a practice address at 821 Health Sciences RD Medical Sciences I C-240, Irvine, CA, 92697. Phone: (949) 824-5818. Providers update this record themselves, so call before visiting.
How can I verify Yesim Yilmaz Demirdag, M.D.'s license?
NPPES lists California license number C166841, 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 Yesim Yilmaz Demirdag, M.D. prescribe under Medicare Part D?
In 2024, Yesim Yilmaz Demirdag, M.D. had 887 Medicare Part D claims for 128 beneficiaries; the average among allergy & immunology physician prescribers was 741. Part D covers Medicare prescriptions only.
What is Yesim Yilmaz Demirdag, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100. 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.