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MR. BRIAN W MILLHOLLON MD
NPI 1841212693
Allergy & Immunology in Phoenix, AZ

Active since July 24, 2006PECOS EnrolledAccepts Medicare Assignment
16611 S 40TH STREET, SUITE 170, PHOENIX, AZ 85048(480) 705-8844(480) 705-8838 Get Directions Write a Review

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

About Mr. Brian W Millhollon Md NPPES

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

MR. BRIAN W MILLHOLLON MD (NPI 1841212693) is an individual allergy & immunology provider in Phoenix, Arizona, licensed in Arizona (21604) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of Louisiana State University School Of Medicine In New Orleans (1982).

NPPES Registry Identity

NPI1841212693
Entity TypeIndividualMale
Primary Taxonomy207K00000X
Provider Legal NameMR. BRIAN W MILLHOLLONCredential: MD
Location Address16611 S 40TH STREET, SUITE 170Phoenix, AZ 85048
Mailing Address16611 S 40th Street, Suite 170Phoenix, AZ 85048 · (480) 705-8844 · Fax (480) 705-8838
Phone(480) 705-8844
Fax(480) 705-8838
Sole ProprietorNo
Medical School CMSLouisiana State University School Of Medicine In New OrleansGraduated 1982
Enumeration DateJuly 24, 2006
Last NPPES UpdateMarch 7, 2023
✔ NPI 1841212693 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyAllergy & ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code207K00000X
License✔ Licensed in AZ · 21604
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.
16611 S 40TH STREET, Phoenix, AZ 85048
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Other Identifiers 1

Other21604AZ · State License

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health.Insurance ›

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

Mr. Brian W Millhollon 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 ID6002841921
PECOS Enrollment IDI20050929000445
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 Brian Millhollon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Arizona Allergy And Asthma Specialists P C
Same address
Clinic/Center
16611 S 40TH ST, SUITE 170
Phoenix, AZ 85048
  • Reassigned Medicare billing, Arizona enrollment
NPI 1831557321 (480) 705-8844

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 8

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.
858 services15 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.
690 services35 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.
435 services26 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.
245 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.
106 services66 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.
17 services17 patients

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 Brian Millhollon's NPI number?

The NPI number for Brian Millhollon is 1841212693. It was assigned to this individual provider in the NPPES registry on July 24, 2006.

Where is Brian Millhollon located?

Brian Millhollon practices at 16611 S 40th Street Suite 170, Phoenix, AZ 85048. The listed phone number is (480) 705-8844.

What is Brian Millhollon's specialty?

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

Is Brian Millhollon enrolled in Medicare?

Yes. Brian Millhollon 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 Brian Millhollon's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Brian Millhollon reassigns Medicare benefits to Arizona Allergy And Asthma Specialists P C (Phoenix, AZ). 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 Brian Millhollon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Brian Millhollon accept?

Health plans from Ambetter Health and Ambetter from Arizona Complete Health list Brian Millhollon as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Brian Millhollon 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.