David William Haas, DC
Chiropractor · Mason City, IA
David William Haas, DC is a chiropractor with a practice address in Mason City, Iowa, and NPI 1366454332, issued on Aug 11, 2006. Check the license (Iowa 06802, as entered in NPPES) with the Iowa board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- David William Haas
- Credential
- DC
- Primary taxonomy
- Chiropractor 111N00000X
- License number
- 06802 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1403 S. Federal Ave., Mason City, IA 50401
- Phone
- (641) 424-6531
- Enumerated
- Aug 11, 2006
- Record last updated
- Mar 17, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (641) 424-6532
- Medicaid ID
- 0482919 IA
- Medicare enrollment
- Enrolled (PECOS I20051206000519); accepts Medicare assignment
- Medical or professional school
- Northwestern College Of Chiropractic, 2004
- Entity
- Type 1 · individual
8 nearest chiropractor records → All 2,019 in Iowa → Look up another NPI →
Verify David William Haas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Iowa board licenses this profession
Search for license 06802Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Dr Richard W Haas Chiropractor PCMason City, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
David William Haas among 2,019 chiropractor records in Iowa
David William Haas, DC is one of 2,019 chiropractor records with a practice address in Iowa. 21% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 21% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2004 · median 2007 among the 1,145 with a school on file
- Record last updated2008 · 71% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 111N00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 chiropractor records list a practice address in Mason City
They are 14 of the 866 NPPES records with a practice address in Mason City, and 2,019 chiropractor records in Iowa.
All 2,019 in Iowa → Every provider in Mason City → Chiropractor nationwide →
The 8 chiropractor records with the nearest ZIP codes
- Brett Cornish, D.C.Mason City, IA 504011548404007
- Damon Dornbier, D.C.Mason City, IA 504011811960586
- Richard Haas, D.C.Mason City, IA 504011770591703
- Nolan Hirota, D.C.Mason City, IA 504011912441858
- Donald Hiscocks, D.C.Mason City, IA 504011568438364
- Joeli Koenig, DCMason City, IA 504011659171627
- Ronald Masters, D.C.Mason City, IA 504011588827471
- Scott Nelson, D.C.Mason City, IA 504011679558001
Common questions
What is David William Haas, DC's NPI number?
David William Haas, DC's National Provider Identifier (NPI) is 1366454332, issued on Aug 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is David William Haas, DC located?
The NPPES record lists a practice address at 1403 S. Federal Ave., Mason City, IA, 50401. Phone: (641) 424-6531. Providers update this record themselves, so call before visiting.
How can I verify David William Haas, DC's license?
NPPES lists Iowa license number 06802, as entered by the provider. Search the Iowa board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.