Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM N SOKOL JR. MD
NPI 1497756522
Allergy & Immunology in Newport Beach, CA

Q: What is William Sokol's NPI number?

The NPI number for William Sokol is 1497756522. It was assigned to this individual provider in the NPPES registry on August 10, 2005.

Q: What is William Sokol's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for William Sokol was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.

Active since August 10, 2005PECOS EnrolledAccepts Medicare AssignmentCLIA 05D2193184 · Waiver

15.53/100

CMS Quality Rating

400 NEWPORT CENTER DR, STE 406, NEWPORT BEACH, CA 92660(949) 645-3374(949) 645-2410 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Jul 13, 2026, Mar 15, 2017, Jan 25, 2017 (3 updates tracked since 2017).

On this page

About William N Sokol Jr. Md NPPES

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

WILLIAM N SOKOL JR. MD (NPI 1497756522) is an individual allergy & immunology provider in Newport Beach, California, licensed in California (C31823) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through September 16, 2026, and is a graduate of Ohio State University College Of Medicine (1968).

NPPES Registry Identity

NPI1497756522

Entity TypeIndividualMale

Primary Taxonomy207K00000X

Provider Legal NameWILLIAM N SOKOL JR.Credential: MD

Location Address400 NEWPORT CENTER DR, STE 406Newport Beach, CA 92660-7630

Mailing Address4950 Barranca Pkwy, Ste 200Irvine, CA 92604-8651 · (949) 645-3374 · Fax (949) 645-2410

Phone(949) 645-3374

Fax(949) 645-2410

Sole ProprietorNo

Medical School CMSOhio State University College Of MedicineGraduated 1968

Enumeration DateAugust 10, 2005

Last NPPES UpdateJuly 13, 20263 updates tracked since enumeration

✔ NPI 1497756522 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

License✔ Licensed in CA · C31823

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.

400 NEWPORT CENTER DR, Newport Beach, CA 92660

Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William N Sokol Jr. Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6305811936

PECOS Enrollment IDI20040827000732

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.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D2193184

William N Sokol Jr MD Inc · Irvine, CA

Active · expires Sep 16, 2026

CLIA Number05D2193184

Laboratory TypePhysician Office

Certificate Effective DateSeptember 17, 2024

Certificate Expiration DateSeptember 16, 2026

Laboratory DirectorWilliam N. Sokol

Laboratory Phone(949) 645-3374

Laboratory LocationWilliam N Sokol Jr MD Inc4950 Barranca Pkwy #200, Irvine, CA 92604

CLIA data matches this NPI record on: Address Phone

This certificate is issued to a laboratory to perform only waived tests.

Areas of Expertise CMS Part B claims 18

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.

Professional service for preparation and provision of 1 or more antigens 95165

This service involves the creation and supply of antigens, substances that stimulate your immune system to fight diseases. These antigens can be used in vaccines or allergy tests to help your body build defenses against specific health threats.

10,542 services229 patients

Test for allergy using allergenic extract 95004

An allergy test with allergenic extract is a diagnostic method to identify substances causing allergic reactions. Small amounts of common allergens are introduced to your body, usually through skin pricks or blood tests. Your body's response helps determine your allergies.

9,667 services119 patients

Test for allergy using allergenic extract injected into skin 95024

An allergy skin test involves injecting a small amount of allergenic extract into your skin. This test helps determine if you're allergic to specific substances. If allergic, a small red bump appears at the test site. It's safe and quick.

3,449 services102 patients

Professional service for multiple injections of allergen 95117

The professional service for multiple injections of allergens involves administering small doses of specific allergens into your body. This is done to help your immune system become less sensitive to them, reducing your allergic reaction over time. It's a safe, effective way to manage allergies.

3,445 services241 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.

1,359 services422 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.

1,029 services378 patients

Ultrasound scan of head and neck soft tissue 76536

An ultrasound scan of the head and neck soft tissue is a non-invasive procedure that uses sound waves to create images of the soft tissues in these areas. It helps identify any abnormalities or issues, such as tumors, cysts, or infections. It's painless and doesn't involve radiation.

562 services281 patients

Test for allergy using skin patch 95044

A skin patch test helps identify allergens causing skin reactions. Small patches with potential allergens are applied to your skin, usually on the back. After 48 hours, they are removed to check for reactions. It's a safe and effective way to diagnose allergies.

445 services16 patients

Injection for rapid desensitization to allergen 95180

Rapid desensitization is a procedure to help your body get used to an allergen, reducing allergic reactions. You'll receive small, increasing amounts of the allergen through injections. This can help your immune system build tolerance, lessening or even eliminating symptoms.

426 services54 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

197 services120 patients

Professional service for single injection of allergen 95115

A single allergen injection is a procedure where a small amount of a specific allergen is injected into your body. This is done to test your body's reaction to the allergen or to help your immune system become less sensitive to it, reducing allergic symptoms.

143 services14 patients

Test for allergy using combination of methods with drug or biological 95018

An allergy test with a drug or biological involves multiple methods. Skin tests may be performed where small amounts of allergens are introduced to the skin. Blood tests measure your immune system's response to specific allergens. These tests help identify what substances you're allergic to.

122 services14 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

93 services93 patients

Inhalation treatment for airway obstruction or sputum production 94640

Inhalation treatment, also known as nebulizer therapy, helps clear airway obstructions and reduce sputum production. It involves breathing in medication through a device, turning it into a mist. This can open up the airways, making breathing easier and helping to cough out mucus.

49 services34 patients

Diagnostic exam of nasal passages using an endoscope 31231

A diagnostic exam of nasal passages using an endoscope is a non-invasive procedure. A small, flexible tube with a light and camera at the end, called an endoscope, is inserted into the nose. This allows the doctor to view the nasal passages and sinuses, helping to identify any issues.

45 services34 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

42 services42 patients

Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212

This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.

14 services14 patients

Test to measure the level of nitric oxide gas 95012

A test to measure the level of nitric oxide gas helps assess inflammation in the lungs, often linked with asthma. You'll breathe into a device, and it'll provide a reading of nitric oxide levels. This helps monitor and manage respiratory conditions.

11 services11 patients

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

15.53/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

Improvement Activities

Cost

51.79

Referred Medical Equipment & Supplies CMS DME claims 3

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

Ambulatory infusion pump, mechanical, reusable, for infusion 8 hours or greater E0779

DME-Other DME · category DE000N

2 suppliers15 claims15 services$11.38 avg. paid by Medicare

Injection, immune globulin (hizentra), 100 mg J1559

Treatment-Injections and Infusions (nononcologic) · category RI008N

2 suppliers20 claims10,280 services$9.51 avg. paid by Medicare

Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552

DME-Other DME · category DE000N

2 suppliers20 claims143 services$2.38 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KELLI JUNKER DDS

Dentist (General Practice)

400 NEWPORT CENTER DR, SUITE 708
NEWPORT BEACH, CA 92660

Orange County (949) 640-2970

DR. KYUYOUNG LIM D.M.D., M.P.H.

Dentist (Periodontics)

400 NEWPORT CENTER DR, 208
NEWPORT BEACH, CA 92660

Orange County (949) 718-0208

DR. ARTHUR JOHN HELLIWELL D.D.S.

Dentist

400 NEWPORT CENTER DR, SUITE 304
NEWPORT BEACH, CA 92660

Orange County (949) 760-6022

ROXANNE GISELLE G LIM MD

Internal Medicine (Gastroenterology)

400 NEWPORT CENTER DR, SUITE 609
NEWPORT BEACH, CA 92660

Orange County (949) 760-0398

ANNA VALERIE OTTAKA M.D.

Internal Medicine

400 NEWPORT CENTER DR, STE 608
NEWPORT BEACH, CA 92660

Orange County (949) 720-4920

JON M. GRAZER MD MPH INC

Plastic Surgery

400 NEWPORT CENTER DR, 302
NEWPORT BEACH, CA 92660

Orange County (949) 644-1240

JAMES E BARBER MD PROFESSIONAL CORPORATION

Clinic/Center (Medical Specialty)

400 NEWPORT CENTER DR, SUITE 409
NEWPORT BEACH, CA 92660

Orange County (949) 760-8040

JAMES L WINTERTON DDS, INC.

Clinic/Center (Dental)

400 NEWPORT CENTER DR, SUITE 304
NEWPORT BEACH, CA 92660

Orange County (949) 760-6022

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 William Sokol's NPI number?

The NPI number for William Sokol is 1497756522. It was assigned to this individual provider in the NPPES registry on August 10, 2005.

Where is William Sokol located?

William Sokol practices at 400 Newport Center Dr Ste 406, Newport Beach, CA 92660. The listed phone number is (949) 645-3374.

What is William Sokol's specialty?

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

Is William Sokol enrolled in Medicare?

Yes. William Sokol is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Does William Sokol hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D2193184) is associated with this NPI, valid through September 16, 2026. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for William Sokol was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 35 days 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.