DR. CHARLES HSIAO-KUNG FENG MD
NPI 1518260306
Allergy & Immunology in Mountain View, CA

Q: What is Charles Feng's NPI number?

The NPI number for Charles Feng is 1518260306. It was assigned to this individual provider in the NPPES registry on December 16, 2010.

Q: What is Charles Feng'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 Charles Feng was last updated on September 23, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.

Active since December 16, 2010PECOS EnrolledAccepts Medicare Assignment

701 E EL CAMINO REAL, MOUNTAIN VIEW, CA 94040(650) 934-7888 Get Directions Write a Review

NPPES record last updated: September 23, 2015. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Dr. Charles Hsiao-kung Feng Md NPPES

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

DR. CHARLES HSIAO-KUNG FENG MD (NPI 1518260306) is an individual allergy & immunology provider in Mountain View, California, licensed in California (A115080) and active in the NPI registry since December 2010. He is enrolled in Medicare PECOS and is a graduate of Other (2009).

NPPES Registry Identity

NPI1518260306

Entity TypeIndividualMale

Primary Taxonomy207K00000X

Provider Legal NameDR. CHARLES HSIAO-KUNG FENGCredential: MD

Location Address701 E EL CAMINO REALMountain View, CA 94040-2833

Mailing Address2350 W. El Camino Real, 2nd FloorMountain View, CA 94040-6203 · (650) 934-7888

Phone(650) 934-7888

Sole ProprietorNo

Medical School CMSOtherGraduated 2009

Enumeration DateDecember 16, 2010

Last NPPES UpdateSeptember 23, 2015

✔ NPI 1518260306 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians

Taxonomy Code207K00000X

License✔ Licensed in CA · A115080

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.

Also ListedInternal MedicineTaxonomy 207R00000X · License A115080 (CA)

701 E EL CAMINO REAL, Mountain View, CA 94040

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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. Charles Hsiao-kung Feng 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 ID6800035007

PECOS Enrollment IDI20130619000536

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 Charles Feng reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Sutter Bay Medical Foundation

6.8 mi

Multi-Specialty

795 EL CAMINO REAL
Palo Alto, CA 94301

Reassigned Medicare billing, California enrollment
4,479 clinicians in this Medicare group

NPI 1013950807 (650) 321-4121

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.

937 services22 patients

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.

340 services19 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.

117 services42 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.

74 services47 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.

57 services14 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.

25 services25 patients

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.

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221

DME-Other DME · category DE017N

1 supplier12 claims28 services$18.27 avg. paid by Medicare

Injection, immune globulin (hizentra), 100 mg J1559

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier12 claims6,000 services$9.50 avg. paid by Medicare

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

DME-Other DME · category DE000N

1 supplier12 claims72 services$2.36 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.

JULIA A CRONIN MD

Allergy & Immunology (Allergy)