Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. David William Haas, DC

Individual provider Chiropractor · NPI 1366454332

Dr. David William Haas, DC is a Chiropractic in Mason City, Iowa. Graduated from Northwestern College of Chiropractic in 2004, 22 years ago. Practices with Dr Richard W Haas Chiropractor PC, a 3-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
22
Trained at
Northwestern College of Chiropractic
Licensed in
IA
In the registry since
2006
What do these letters mean?
DC — Doctor of Chiropractic
A licensed chiropractor.

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Practice location Address checks out

1403 S Federal Ave
Mason City, IA 50401
Phone: (641) 424-6531
Fax: (641) 424-6532
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Chiropractor (primary) Taxonomy 111N00000X · Licence 06802 (IA)

Record details

NPI number1366454332
Entity typeIndividual (Type 1)
GenderMale
Credentials DC
Sole proprietorNo
NPI enumeratedAugust 11, 2006
Last updated in NPPESMarch 17, 2008
Mailing address1403 S. Federal Ave., Mason City, IA 50401

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCHIROPRACTIC
Medical schoolNORTHWESTERN COLLEGE OF CHIROPRACTIC
Graduated 2004 (22 years in practice)
Group practice Dr Richard W Haas Chiropractor Pc — 3 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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