Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Crystal J Kleiber Balderrama, M.D.

Rheumatology Physician in Fond Du Lac, WI · enumerated 2010.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1144545559

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Registry record

Entity type Individual (Type 1)

Name Dr. Crystal J Kleiber Balderrama

Credential M.D.

Sex Female

Practice address 420 E Division St, Fond Du Lac, WI, 54935

Phone (920) 926-8340

Fax (414) 805-6851

Enumeration date Mar 30, 2010

Last updated in NPPES Oct 21, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 56510 (WI) Secondary

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 56510 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1144545559 active?

Yes, as of the latest NPPES snapshot, NPI 1144545559 is active (record last updated 2020-10-21).

How do I verify Crystal Kleiber Balderrama's NPI record?

Cross-check NPI 1144545559 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-21.