DR. ANITA CARMEN CHOY MD
NPI 1639136690
Allergy & Immunology - Allergy in Palo Alto, CA

Q: What is Anita Choy's NPI number?

The NPI number for Anita Choy is 1639136690. It was assigned to this individual provider in the NPPES registry on April 26, 2006.

Q: What is Anita Choy's specialty?

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

Q: When was this NPI record last updated?

The NPPES record for Anita Choy was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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 April 26, 2006PECOS EnrolledAccepts Medicare Assignment

1101 WELCH RD, #A2, PALO ALTO, CA 94304(650) 322-3847(650) 322-3249 Get Directions Write a Review

NPPES record last updated: March 7, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Mar 7, 2023, May 31, 2017 (2 updates tracked since 2017).

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About Dr. Anita Carmen Choy Md NPPES

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

DR. ANITA CARMEN CHOY MD (NPI 1639136690) is an individual allergy provider in Palo Alto, California, licensed in California (A50663) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1986).

NPPES Registry Identity

NPI1639136690

Entity TypeIndividualFemale

Primary Taxonomy207KA0200X

Provider Legal NameDR. ANITA CARMEN CHOYCredential: MD

Location Address1101 WELCH RD, #A2Palo Alto, CA 94304-1904

Mailing Address211 Quarry Rd, # 106Palo Alto, CA 94304-1416 · (650) 322-3847 · Fax (650) 322-3249

Phone(650) 322-3847

Fax(650) 322-3249

Sole ProprietorYes

Medical School CMSOtherGraduated 1986

Enumeration DateApril 26, 2006

Last NPPES UpdateMarch 7, 20232 updates tracked since enumeration

✔ NPI 1639136690 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 · A50663

Definition

A physician who specializes in the diagnosis, treatment, and management of allergies. Source: National Uniform Claim Committee

1101 WELCH RD, Palo Alto, CA 94304

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Other Identifiers 1

OtherA50663CA · State License

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. Anita Carmen Choy 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 ID2264534577

PECOS Enrollment IDI20070216000271

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

Welch Pasteur Allergy Medical Group Inc

Same address

Allergy

1101 WELCH RD, STE A-2
Palo Alto, CA 94304

Reassigned Medicare billing, California enrollment

NPI 1578571154 (650) 322-3847

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 12

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.

2,112 services60 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.

994 services20 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.

934 services62 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.

400 services19 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.

146 services67 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.

109 services63 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.

108 services70 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.

106 services55 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.

46 services31 patients

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.

24 services21 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.

13 services13 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

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

Budesonide, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, up to 0.5 mg J7626

DME-Drugs Administered Through DME · category DG000N

3 suppliers12 claims1,172 services$0.83 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.

MS. COLEEN TRAVERS LCSW, ACSW

Social Worker (Clinical)

1101 WELCH RD, SUITE A-1, MC 5776
PALO ALTO, CA 94304

Santa Clara County (650) 736-2613

HARVEY, BALL & SHARRON MDS, INC

Pediatrics

1101 WELCH RD, SUITE A1
PALO ALTO, CA 94304

Santa Clara County (650) 329-0300

DR. HAILEN MAK MD

Allergy & Immunology (Allergy)

1101 WELCH RD, SUITE A-2
PALO ALTO, CA 94304

Santa Clara County (650) 322-3847

ROBERT EDWARD MINDELZUN M.D.

Radiology (Diagnostic Radiology)

1101 WELCH RD
PALO ALTO, CA 94304

Santa Clara County (650) 723-6345

DR. PETER CRAIG CASSINI M.D.

Psychiatry & Neurology (Neurology)

1101 WELCH RD, SUITE C-5
PALO ALTO, CA 94304

Santa Clara County (650) 324-4300

DR. BRUCE T ADORNATO M.D.

Psychiatry & Neurology (Neurology)

1101 WELCH RD, SUITE C5
PALO ALTO, CA 94304

Santa Clara County (650) 324-4300

DR. JELENA VUKICEVIC MD

Pediatrics

1101 WELCH RD, SUITE A1
PALO ALTO, CA 94304

Santa Clara County (650) 329-0300

FREDERIC LUSKIN

Marriage & Family Therapist

1101 WELCH RD, SUITE A6
PALO ALTO, CA 94304

Santa Clara County (650) 498-5566

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 Anita Choy's NPI number?

The NPI number for Anita Choy is 1639136690. It was assigned to this individual provider in the NPPES registry on April 26, 2006.

Where is Anita Choy located?

Anita Choy practices at 1101 Welch Rd #a2, Palo Alto, CA 94304. The listed phone number is (650) 322-3847.

What is Anita Choy's specialty?

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

Is Anita Choy enrolled in Medicare?

Yes. Anita Choy 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 Anita Choy's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Anita Choy reassigns Medicare benefits to Welch Pasteur Allergy Medical Group Inc (Palo Alto, 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 Anita Choy'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 Anita Choy was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.