1. Home
  2. Directory
  3. California
  4. Diamond Bar
  5. Dietitian Registered
  6. NPI Profile

MS. IRENE MICHELLE KRISTAL RD
NPI 1033363791
Dietitian, Registered in Diamond Bar, CA

Active since November 07, 2008
21465 RUNNING BRANCH RD, DIAMOND BAR, CA 91765(805) 300-0300 Get Directions Write a Review

NPPES record last updated: January 31, 2013. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Ms. Irene Michelle Kristal Rd NPPES

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

MS. IRENE MICHELLE KRISTAL RD (NPI 1033363791) is an individual dietitian, registered in Diamond Bar, California, licensed in California (862117) and active in the NPI registry since November 2008.

NPPES Registry Identity

NPI1033363791
Entity TypeIndividualFemale
Primary Taxonomy133V00000X
Provider Legal NameMS. IRENE MICHELLE KRISTALCredential: RD
Location Address21465 RUNNING BRANCH RDDiamond Bar, CA 91765-3751
Mailing Address21465 Running Branch RdDiamond Bar, CA 91765-3751 · (805) 300-0300
Phone(805) 300-0300
Sole ProprietorYes
Enumeration DateNovember 7, 2008
Last NPPES UpdateJanuary 31, 2013
✔ NPI 1033363791 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDietitian, RegisteredDietary & Nutritional Service Providers
Taxonomy Code133V00000X
License✔ Licensed in CA · 862117
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.
21465 RUNNING BRANCH RD, Diamond Bar, CA 91765
Open in Google Maps ↗

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Ms. Irene Michelle Kristal Rd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Billing Reassignment

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

Zaghi Medical Inc
30 mi
Internal Medicine
5665 WILSHIRE BLVD # 1609
Los Angeles, CA 90036
  • Reassigned Medicare billing, California enrollment
  • 24 clinicians in this Medicare group
NPI 1346942133 (424) 600-8360

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

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 Irene Kristal's NPI number?

The NPI number for Irene Kristal is 1033363791. It was assigned to this individual provider in the NPPES registry on November 7, 2008.

Where is Irene Kristal located?

Irene Kristal practices at 21465 Running Branch Rd, Diamond Bar, CA 91765. The listed phone number is (805) 300-0300.

What is Irene Kristal's specialty?

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

Is Irene Kristal enrolled in Medicare?

Yes. Irene Kristal is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Irene Kristal's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Irene Kristal reassigns Medicare benefits to Zaghi Medical Inc (Los Angeles, 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 Irene Kristal'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 Irene Kristal was last updated on January 31, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.