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WILLIAM D GRAINGER MD
NPI 1003963679
Psychiatry & Neurology - Neurology in Gilbert, AZ

Active since January 04, 2007PECOS Enrolled
726 N GREENFIELD RD, SUITE 110, GILBERT, AZ 85234(480) 834-8885(480) 751-5724 Get Directions Write a Review

NPPES record last updated: June 30, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About William D Grainger Md NPPES

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

WILLIAM D GRAINGER MD (NPI 1003963679) is an individual neurology provider in Gilbert, Arizona, licensed in Arizona (AZ15336) and active in the NPI registry since January 2007. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1003963679
Entity TypeIndividualMale
Primary Taxonomy2084N0400X
Provider Legal NameWILLIAM D GRAINGERCredential: MD
Location Address726 N GREENFIELD RD, SUITE 110Gilbert, AZ 85234-5012
Mailing Address1343 N Alma School Rd, Ste 160Chandler, AZ 85224-5901 · (480) 776-2982 · Fax (480) 917-7309
Phone(480) 834-8885
Fax(480) 751-5724
Sole ProprietorNo
Enumeration DateJanuary 4, 2007
Last NPPES UpdateJune 30, 2021
NPPES CertifiedJune 30, 2021
✔ NPI 1003963679 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · NeurologyAllopathic & Osteopathic Physicians
Taxonomy Code2084N0400X
License✔ Licensed in AZ · AZ15336
Definition
A Neurologist specializes in the diagnosis and treatment of diseases or impaired function of the brain, spinal cord, peripheral nerves, muscles, autonomic nervous system, and blood vessels that relate to these structures.
726 N GREENFIELD RD, Gilbert, AZ 85234
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

William D Grainger Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

Phoenix Neurological Institute, Inc
7.3 mi
Neurology
1343 N ALMA SCHOOL RD, STE 160
Chandler, AZ 85224
  • Reassigned Medicare billing, Arizona enrollment
  • 53 clinicians in this Medicare group
NPI 1336319086 (480) 776-2892

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85234 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$127.71 typical visit price
range $55.44 – $168.60
Typical copayment $31.92 (range $13.86 – $42.15)
Most-billed visit code 99204
Established Patient
$98.00 typical visit price
range $17.72 – $137.41
Typical copayment $24.50 (range $4.43 – $34.35)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 19

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

VICTOR D URQUIDI
Behavior Technician
726 N GREENFIELD RD
GILBERT, AZ 85234
Maricopa County (602) 649-0248
GENERAL SURGERY OF PAYSON PLLC
Surgery
726 N GREENFIELD RD, SUITE 105
GILBERT, AZ 85234
Maricopa County (480) 296-3353
WILLIAM CHARLES MONTIGNANI VI
Behavior Technician
726 N GREENFIELD RD
GILBERT, AZ 85234
Maricopa County (480) 893-7685
MARIS MARIE SHOTWELL
Behavior Technician
726 N GREENFIELD RD
GILBERT, AZ 85234
Maricopa County (602) 649-0248
PAUL KELLY MAXILLOFACIAL PC
Dentist (Oral and Maxillofacial Surgery)
726 N GREENFIELD RD, SUITE #117
GILBERT, AZ 85234
Maricopa County (480) 258-0879
SARA ELIZABETH LAZENBY
Behavior Technician
726 N GREENFIELD RD
GILBERT, AZ 85234
Maricopa County (602) 649-0248
DR. PAUL JOHN KELLY DDS, MS
Dentist (Oral and Maxillofacial Surgery)
726 N GREENFIELD RD, SUITE 117
GILBERT, AZ 85234
Maricopa County (480) 685-9696
ORTHOPEDIC EMERGENCY SERVICES, LLC
Orthopaedic Surgery
726 N GREENFIELD RD, SUITE 108
GILBERT, AZ 85234
Maricopa County (480) 993-4618

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 Grainger's NPI number?

The NPI number for William Grainger is 1003963679. It was assigned to this individual provider in the NPPES registry on January 4, 2007.

Where is William Grainger located?

William Grainger practices at 726 N Greenfield Rd Suite 110, Gilbert, AZ 85234. The listed phone number is (480) 834-8885.

What is William Grainger's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurology, with taxonomy code 2084N0400X.

Is William Grainger enrolled in Medicare?

Yes. William Grainger is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Grainger's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Grainger reassigns Medicare benefits to Phoenix Neurological Institute, Inc (Chandler, 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 William Grainger's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does William Grainger accept?

Health plans from Blue Cross Blue Shield of Arizona list William Grainger 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 William Grainger was last updated on June 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.