Yesim Yilmaz Demirdag, M.D.
NPI 1134330921 · Allergy & Immunology Physician · Irvine, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yesim Yilmaz Demirdag, M.D. is a Allergy & Immunology Physician provider in Irvine, CA (NPI 1134330921).
Provider details
- NPI number
- 1134330921
- Entity type
- Individual
- Primary specialty
- Allergy & Immunology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- C166841 (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
19 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
343 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 99 | $107 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 60 | $154 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 46 | $107 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 34 | $156 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 20 | $72 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,090 across 9 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
- 2007-05-24
- Last updated
- 2020-08-27
- Certified
- 2020-08-27
Frequently asked questions
- What is Yesim Yilmaz Demirdag's NPI number?
- Yesim Yilmaz Demirdag's National Provider Identifier (NPI) is 1134330921, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yesim Yilmaz Demirdag's specialty?
- Yesim Yilmaz Demirdag is listed in the NPPES registry with a primary specialty of Allergy & Immunology Physician (Allopathic & Osteopathic Physicians).
- Where is Yesim Yilmaz Demirdag located?
- Yesim Yilmaz Demirdag's practice location on file with NPPES is 821 Health Sciences Rd Medical Sciences I C-240, Irvine, CA 92697-9214.
- What is Yesim Yilmaz Demirdag's phone number?
- The practice phone number listed in the NPPES registry for Yesim Yilmaz Demirdag is (949) 824-5818.
- Does Yesim Yilmaz Demirdag accept Medicare?
- Yesim Yilmaz Demirdag is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yesim Yilmaz Demirdag's NPI active?
- Yes — Yesim Yilmaz Demirdag's NPI (1134330921) is active in the NPPES registry as of the last update on 2020-08-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.