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DR. DAVID WILLIAM HAAS DC
NPI 1366454332
Chiropractor in Mason City, IA

Active since August 11, 2006Accepts Medicare Assignment
1403 S. FEDERAL AVE., MASON CITY, IA 50401(641) 424-6531(641) 424-6532 Get Directions Write a Review

NPPES record last updated: March 17, 2008. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Dr. David William Haas Dc NPPES

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

DR. DAVID WILLIAM HAAS DC (NPI 1366454332) is an individual chiropractor in Mason City, Iowa, licensed in Iowa (06802) and active in the NPI registry since August 2006. He is a graduate of Northwestern College Of Chiropractic (2004).

NPPES Registry Identity

NPI1366454332
Entity TypeIndividualMale
Primary Taxonomy111N00000X
Provider Legal NameDR. DAVID WILLIAM HAASCredential: DC
Location Address1403 S. FEDERAL AVE.Mason City, IA 50401
Mailing Address1403 S. Federal Ave.Mason City, IA 50401 · (641) 424-6531 · Fax (641) 424-6532
Phone(641) 424-6531
Fax(641) 424-6532
Sole ProprietorNo
Medical School CMSNorthwestern College Of ChiropracticGraduated 2004
Enumeration DateAugust 11, 2006
Last NPPES UpdateMarch 17, 2008
✔ NPI 1366454332 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyChiropractorChiropractic Providers
Taxonomy Code111N00000X
License✔ Licensed in IA · 06802
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.
1403 S. FEDERAL AVE., Mason City, IA 50401
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Other Identifiers 3

Medicare PINI16577IA
Medicare UPINV07485
Medicaid0482919IA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. David William Haas Dc is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1254351257
PECOS Enrollment IDI20051206000519

Medicare Billing Reassignment

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

Dr Richard W Haas Chiropractor PC
Same address
Chiropractor
1403 S FEDERAL AVE
Mason City, IA 50401
  • Reassigned Medicare billing, Iowa enrollment
  • 3 clinicians in this Medicare group
NPI 1639241920 (641) 424-6531

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

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Chiropractic manipulative treatment, 3-4 spinal regions 98941
Chiropractic manipulative treatment for 3-4 spinal regions involves a trained professional applying controlled force to specific areas of your spine. This can help alleviate pain, improve physical function, and support your body's natural healing process.
1,050 services117 patients
Chiropractic manipulative treatment, 1-2 spinal regions 98940
Chiropractic manipulative treatment focuses on adjusting your spine to improve your body's physical function. In this service, a chiropractor applies controlled force to 1-2 spinal regions. This helps to restore mobility and alleviate discomfort in those areas.
52 services22 patients

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 David Haas's NPI number?

The NPI number for David Haas is 1366454332. It was assigned to this individual provider in the NPPES registry on August 11, 2006.

Where is David Haas located?

David Haas practices at 1403 S. Federal Ave., Mason City, IA 50401. The listed phone number is (641) 424-6531.

What is David Haas's specialty?

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

Is David Haas enrolled in Medicare?

Yes. David Haas is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for David Haas's services?

According to the CMS Revalidation Reassignment List (October 2026 release), David Haas reassigns Medicare benefits to Dr Richard W Haas Chiropractor PC (Mason City, IA). 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 David Haas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does David Haas accept?

Health plans from Ambetter Health, Ambetter Health of Delaware, Ambetter from NH Healthy Families, Ambetter from Sunflower Health Plan and Oscar Insurance Company and 1 other insurer list David Haas as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for David Haas was last updated on March 17, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.