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Newly Listed Provider — this NPI profile has been added to the NPI registry within the last 90 days.

DR. MASON JOSEPH KLAAS DC
NPI 1609790468
Chiropractor in Bartlett, IL

Active since August 05, 2026
260 E ARMY TRAIL RD STE D, BARTLETT, IL 60103(630) 830-8600 Get Directions Write a Review

NPPES record added: August 5, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Mason Joseph Klaas Dc NPPES

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

DR. MASON JOSEPH KLAAS DC (NPI 1609790468) is an individual chiropractor in Bartlett, Illinois, licensed in Illinois (038.024504) and active in the NPI registry since August 2026.

NPPES Registry Identity

NPI1609790468
Entity TypeIndividualMale
Primary Taxonomy111N00000X
Provider Legal NameDR. MASON JOSEPH KLAASCredential: DC
Location Address260 E ARMY TRAIL RD STE DBartlett, IL 60103-3005
Mailing Address260 E Army Trail Rd Ste DBartlett, IL 60103-3005 · (630) 830-8600
Phone(630) 830-8600
Sole ProprietorNo
Enumeration DateAugust 5, 2026
NPPES CertifiedAugust 5, 2026
✔ NPI 1609790468 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyChiropractorChiropractic Providers
Taxonomy Code111N00000X
License✔ Licensed in IL · 038.024504
Definition
A provider qualified by a Doctor of Chiropractic (D.C.), licensed by the State and who practices chiropractic medicine -that discipline within the healing arts which deals with the nervous system and its relationship to the spinal column and its interrelationship with other body systems.
260 E ARMY TRAIL RD STE D, Bartlett, IL 60103
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Other Providers at the Same Location NPPES 8

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

COURTNEY RHEA TRESSEL
Physical Therapist
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
DR. HARSHANG SHETH DC
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
DR. GRIFFIN GIBSON DC
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
FRANK AMBROSIO D.C.
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
CEORA FAIR DC
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
DR. KENNETH LEE BRYAN JR. DC
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
ERIN ELIZABETH BLACKBURN LAT, ATC
Specialist/Technologist (Athletic Trainer)
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600
DR. MICHAEL C CALCAGNO D.C.
Chiropractor
260 E ARMY TRAIL RD STE D
BARTLETT, IL 60103
Dupage County (630) 830-8600

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 Mason Klaas's NPI number?

The NPI number for Mason Klaas is 1609790468. It was assigned to this individual provider in the NPPES registry on August 5, 2026.

Where is Mason Klaas located?

Mason Klaas practices at 260 E Army Trail Rd Ste D, Bartlett, IL 60103. The listed phone number is (630) 830-8600.

What is Mason Klaas's specialty?

The primary specialty registered for this NPI is Chiropractor with taxonomy code 111N00000X.

When was this NPI record last updated?

The NPPES record for Mason Klaas was last updated on August 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 days 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.