1. Home
  2. Directory
  3. California
  4. Costa Mesa
  5. Allergy Immunology
  6. NPI Profile

DR. DENIS J YOSHII D.O.
NPI 1124091814
Allergy & Immunology in Costa Mesa, CA

Active since February 11, 2006PECOS Enrolled
1700 ADAMS AVE STE 100, COSTA MESA, CA 92626(714) 549-0301(714) 549-7553 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Denis J Yoshii D.o. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DENIS J YOSHII D.O. (NPI 1124091814) is an individual allergy & immunology provider in Costa Mesa, California, licensed in California (20A6936) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1995).

NPPES Registry Identity

NPI1124091814
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameDR. DENIS J YOSHIICredential: D.O.
Location Address1700 ADAMS AVE STE 100Costa Mesa, CA 92626-4865
Mailing Address1700 Adams Ave Ste 100Costa Mesa, CA 92626-4865 · (714) 549-0301 · Fax (714) 549-7553
Phone(714) 549-0301
Fax(714) 549-7553
Sole ProprietorNo
Medical School CMSOtherGraduated 1995
Enumeration DateFebruary 11, 2006
Last NPPES UpdateJuly 8, 2007
✔ NPI 1124091814 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
Licenses✔ Licensed in CA · 20A6936✔ Licensed in NV · 1005
Definition
An allergist-immunologist is trained in evaluation, physical and laboratory diagnosis, and management of disorders involving the immune system. Selected examples of such conditions include asthma, anaphylaxis, rhinitis, eczema, and adverse reactions to drugs, foods, and insect stings as well as immune deficiency diseases (both acquired and congenital), defects in host defense, and problems related to autoimmune disease, organ transplantation, or malignancies of the immune system.
1700 ADAMS AVE STE 100, Costa Mesa, CA 92626
Open in Google Maps ↗

Other Identifiers 1

Medicare UPINH31246

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Denis J Yoshii D.o. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID4385668292
PECOS Enrollment IDI20060118000847
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Denis Yoshii reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Denis J Yoshii, Do Inc
Pediatric Allergy/Immunology
26750 TOWNE CENTRE DR, SUITE D
Foothill Ranch, CA 92610
  • Reassigned Medicare billing, California enrollment
NPI 1881712578 (949) 916-0888

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
51 services28 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
27 services22 patients
Test to measure expiratory airflow and volume 94010
This test, known as spirometry, assesses how well your lungs work. It measures how much air you can inhale, how much you can exhale and how quickly you can exhale. It's non-invasive and helps diagnose conditions like asthma or COPD.
16 services14 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
12 services12 patients

Referred Medical Equipment & Supplies CMS DME claims 6

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221
DME-Other DME · category DE017N
3 suppliers18 claims58 services$18.29 avg. paid by Medicare
Injection, immune globulin (hizentra), 100 mg J1559
Treatment-Injections and Infusions (nononcologic) · category RI008N
3 suppliers18 claims4,920 services$9.48 avg. paid by Medicare
Injection, immune globulin, (gamunex-c/gammaked), non-lyophilized (e.g., liquid), 500 mg J1561
Treatment-Injections and Infusions (nononcologic) · category RI008N
2 suppliers12 claims720 services$34.75 avg. paid by Medicare
Injection, immune globulin, (gammagard liquid), non-lyophilized, (e.g., liquid), 500 mg J1569
Treatment-Injections and Infusions (nononcologic) · category RI008N
2 suppliers15 claims900 services$35.73 avg. paid by Medicare
Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552
DME-Other DME · category DE000N
3 suppliers18 claims57 services$2.36 avg. paid by Medicare
Services, supplies and accessories used in the home under the medicare intravenous immune globulin (ivig) demonstration Q2052
Treatment-Chemotherapy · category RH012N
3 suppliers21 claims21 services$300.74 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Denis Yoshii's NPI number?

The NPI number for Denis Yoshii is 1124091814. It was assigned to this individual provider in the NPPES registry on February 11, 2006.

Where is Denis Yoshii located?

Denis Yoshii practices at 1700 Adams Ave Ste 100, Costa Mesa, CA 92626. The listed phone number is (714) 549-0301.

What is Denis Yoshii's specialty?

The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.

Is Denis Yoshii enrolled in Medicare?

Yes. Denis Yoshii is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Denis Yoshii's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Denis Yoshii reassigns Medicare benefits to Denis J Yoshii, Do Inc (Foothill Ranch, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Denis Yoshii's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Denis Yoshii was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.