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DR. KENNETH W. LIEN MD
NPI 1396823092
Allergy & Immunology - Allergy in Castro Valley, CA

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment
20400 LAKE CHABOT RD, STE. 304, CASTRO VALLEY, CA 94546(510) 537-0700(510) 537-7795 Get Directions Write a Review

NPPES record last updated: February 3, 2014. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Kenneth W. Lien Md NPPES

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

DR. KENNETH W. LIEN MD (NPI 1396823092) is an individual allergy provider in Castro Valley, California, licensed in California (A72098) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Chicago, Pritzker School Of Medicine (1998).

NPPES Registry Identity

NPI1396823092
Entity TypeIndividualMale
Primary Taxonomy207KA0200X
Provider Legal NameDR. KENNETH W. LIENCredential: MD
Location Address20400 LAKE CHABOT RD, STE. 304Castro Valley, CA 94546-5316
Mailing Address20400 Lake Chabot Rd Ste 304, Ste. 304Castro Valley, CA 94546-5316 · (510) 537-0700 · Fax (510) 537-7795
Phone(510) 537-0700
Fax(510) 537-7795
Sole ProprietorNo
Medical School CMSUniversity Of Chicago, Pritzker School Of MedicineGraduated 1998
Enumeration DateNovember 1, 2006
Last NPPES UpdateFebruary 3, 2014
✔ NPI 1396823092 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & Immunology · AllergyAllopathic & Osteopathic Physicians
Taxonomy Code207KA0200X
License✔ Licensed in CA · A72098
Definition
A physician who specializes in the diagnosis, treatment, and management of allergies. Source: National Uniform Claim Committee
20400 LAKE CHABOT RD, Castro Valley, CA 94546
Open in Google Maps ↗

Other Identifiers 3

Medicaid1396823092CA
OtherEK627ZCA · Individual Medicare Ptan
OtherCA110780CA · Grp Ptan For Allergy, Asthma & Sinus Centers Of Silicon Valley

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Kenneth W. Lien 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 ID840396818
PECOS Enrollment IDI20070508000420
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 Kenneth Lien reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Allergy, Asthma & Sinus Centers Of Silicon Valley, Inc.
Same address
Allergy
20400 LAKE CHABOT RD STE 304
Castro Valley, CA 94546
  • Reassigned Medicare billing, California enrollment
NPI 1609210590 (510) 537-0700

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 7

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.

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.
4,642 services58 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.
1,540 services22 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.
272 services140 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.
153 services80 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.
52 services52 patients
Test to measure expiratory airflow and volume changes before and after medication administration 94060
This procedure measures how air flows in and out of your lungs. It's done before and after medication to see if the treatment improves your breathing. It's a simple, non-invasive test that involves breathing into a device called a spirometer.
32 services30 patients

Referred Medical Equipment & Supplies CMS DME claims 4

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
2 suppliers21 claims52 services$18.31 avg. paid by Medicare
Ambulatory infusion pump, mechanical, reusable, for infusion 8 hours or greater E0779
DME-Other DME · category DE000N
2 suppliers11 claims11 services$11.60 avg. paid by Medicare
Injection, immune globulin (hizentra), 100 mg J1559
Treatment-Injections and Infusions (nononcologic) · category RI008N
2 suppliers16 claims13,600 services$9.55 avg. paid by Medicare
Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552
DME-Other DME · category DE000N
2 suppliers16 claims157 services$2.37 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

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

SUSAN MARY KARPLUS N.P.
Nurse Practitioner (Family)
20400 LAKE CHABOT RD, SUITE 102
CASTRO VALLEY, CA 94546
Alameda County (510) 247-9227

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 Kenneth Lien's NPI number?

The NPI number for Kenneth Lien is 1396823092. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Kenneth Lien located?

Kenneth Lien practices at 20400 Lake Chabot Rd Ste. 304, Castro Valley, CA 94546. The listed phone number is (510) 537-0700.

What is Kenneth Lien's specialty?

The primary specialty registered for this NPI is Allergy & Immunology, specializing in Allergy, with taxonomy code 207KA0200X.

Is Kenneth Lien enrolled in Medicare?

Yes. Kenneth Lien 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.

Which organization bills Medicare for Kenneth Lien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Kenneth Lien reassigns Medicare benefits to Allergy, Asthma & Sinus Centers Of Silicon Valley, Inc. (Castro Valley, 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 Kenneth Lien'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 Kenneth Lien was last updated on February 3, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.