HILLARY ANN ONETO BUCH
NPI 1871951582
Dietitian, Registered in Casa Grande, AZ

Q: What is Hillary Buch's NPI number?

The NPI number for Hillary Buch is 1871951582. It was assigned to this individual provider in the NPPES registry on February 9, 2016. The provider is also known as Hillary Ann Oneto.

Q: What is Hillary Buch's specialty?

The primary specialty registered for this NPI is Dietitian, Registered with taxonomy code 133V00000X.

Q: When was this NPI record last updated?

The NPPES record for Hillary Buch was last updated on August 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 months 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 February 09, 2016

1281 E COTTONWOOD LN, CASA GRANDE, AZ 85122(520) 863-9800(520) 863-1510 Get Directions Write a Review

NPPES record last updated: August 4, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Aug 4, 2025, Feb 9, 2016 (2 updates tracked since 2016).

On this page

About Hillary Ann Oneto Buch NPPES

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

HILLARY ANN ONETO BUCH (NPI 1871951582) is an individual dietitian, registered in Casa Grande, Arizona, licensed in Louisiana (3236) and active in the NPI registry since February 2016. She maintains 6 additional practice locations.

NPPES Registry Identity

NPI1871951582

Entity TypeIndividualFemale

Primary Taxonomy133V00000X

Provider Legal NameHILLARY ANN ONETO BUCH

Location Address1281 E COTTONWOOD LNCasa Grande, AZ 85122-2949

Mailing AddressPo Box 749495Atlanta, GA 30374-9495 · (855) 963-2100 · Fax (813) 321-1296

Phone(520) 863-9800

Fax(520) 863-1510

Sole ProprietorNo

Enumeration DateFebruary 9, 2016

Last NPPES UpdateAugust 4, 20252 updates tracked since enumeration

NPPES CertifiedAugust 4, 2025

✔ NPI 1871951582 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDietitian, RegisteredDietary & Nutritional Service Providers

Taxonomy Code133V00000X

Licenses✔ Licensed in LA · 3236✔ Licensed in FL · ND8632✔ Licensed in IN · 37003963A✔ Licensed in MO · 2011026060✔ Licensed in ID · D-1588✔ Licensed in NC · L006791✔ Licensed in MO · 2025028888✔ Licensed in OH · LD.09070✔ Licensed in HI · 440-LD✔ Licensed in TX · DT89424

Definition

A Registered Dietitian (RD)/Registered Dietitian Nutritionist (RDN) is an individual uniquely trained in the science of nutrition and practice of dietetics to design and provide medical nutrition therapy (MNT) and other evidence-based applications of the Nutrition Care Process (NCP) that exemplify the profession's systematic approach to providing high quality nutrition care. Registered dietitians provide MNT for the purpose of disease prevention or management, or to treat or rehabilitate an illness, injury, or condition, with the use of specific, indicated physical and cognitive nutrition care services comprised of one or more of the following aspects of the NCP: nutrition assessment/reassessment, nutrition diagnosis, nutrition intervention (e.g., nutrition counseling, therapeutic diet ordering, and nutrition education) and nutrition monitoring and evaluation.

1281 E COTTONWOOD LN, Casa Grande, AZ 85122

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Other Names 1

Former Name (1)Hillary Ann Oneto

Secondary Practice Locations 6

Location 11 Barnes Jewish Hospital Plz, Mailstop 90-17-334Saint Louis, MO 63110-1003 · Phone (314) 362-3833

Location 2500 Ala Moana Blvd, Suite 6-230Honolulu, HI 96813-4929 · Phone (808) 524-6115 · Fax (808) 528-1711

Location 318354 Interstate 45 S Ste 200Shenandoah, TX 77384-4993 · Phone (936) 235-7092 · Fax (281) 805-7320

Location 4605 Medical Center Drive, Suite BAlexandria, LA 71301-8143 · Phone (225) 767-0822 · Fax (225) 769-5424

Location 54242 Highway 19, Building 3, Suite BZachary, LA 70791 · Phone (225) 306-7260 · Fax (225) 654-0717

Location 63850 S. National Ave, Suite 600Springfield, MO 65807-5230 · Phone (417) 882-4880 · Fax (417) 882-7843

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Hillary Ann Oneto Buch is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Billing Reassignment

Medicare enrollment records show Hillary Buch reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

American Oncology Partners PA

1,669 mi

Hematology & Oncology

3100 PLAZA PROPERTIES BLVD
Columbus, OH 43219

Reassigned Medicare billing, Arizona and Missouri enrollments
26 clinicians in this Medicare group

NPI 1265929723 (614) 383-6000

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

Other Providers at the Same Location NPPES 12

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

ROBERT JOHN MCDONALD MD

Radiology (Diagnostic Radiology)