NPPES file of Aug 9, 2026

Joan K. Maertens, RD,LD

Registered Dietitian · Mason City, IA

Joan K. Maertens, RD,LD is a registered dietitian with a practice address in Mason City, Iowa, and NPI 1770623472, issued on Feb 8, 2007. Check the license (Iowa 30500418, as entered in NPPES) with the Iowa board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1770623472
Name
Joan K. Maertens
Credential
RD,LD
Primary taxonomy
Registered Dietitian 133V00000X
License number
30500418 IA
Self-reported in NPPES; status is on the state search
Practice location
910 N Eisenhower Ave, Mason City, IA 50401
Phone
(641) 422-6443
Enumerated
Feb 8, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(641) 422-5274
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest registered dietitian records → All 694 in Iowa → Look up another NPI →

Also registered at 910 N Eisenhower Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Sadie BohlNurse Practitioner1821694258
  2. Benjamin Buffington, PHARMDPharmacist1770136194
  3. Kerri ConwayOccupational Therapist1922580125
  4. Hashim Eldadah, M.D.Pediatrics Physician1578559761
  5. Joshua Francois, DOPediatrics Physician1396314167
  6. Keith Hargis, RD,LDRegistered Dietitian1669800454

Verify Joan K. Maertens in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Iowa board licenses this profession
    Search for license 30500418    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Iowa license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Joan K. Maertens among 694 registered dietitian records in Iowa

Joan K. Maertens, RD,LD is one of 694 registered dietitian records with a practice address in Iowa. 5% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2007, is newer than 10% of them.

  • NPI issued2007 · 10% of these records are older, 79% newer
  • In a Medicare fileNo · 5% of these records are
  • In the CMS Doctors and Clinicians fileNo · 7% of these records are
  • Record last updated2007 · 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 133V00000X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

14 registered dietitian records list a practice address in Mason City

They are 14 of the 866 NPPES records with a practice address in Mason City, and 694 registered dietitian records in Iowa. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 694 in Iowa → Every provider in Mason City → Registered Dietitian nationwide →

The 8 registered dietitian records with the nearest ZIP codes

  1. Jennifer Arndt, MS, RDN, LDMason City, IA 504011306407176
  2. Kelsi Bauermeister, RD, LDMason City, IA 504011972900454
  3. Keith Hargis, RD,LDMason City, IA 504011669800454
  4. Alicia Helm, RDN, LDMason City, IA 504011982355566
  5. Kathleen Koch, RD, LDMason City, IA 504011407173719
  6. Sugianawaty Mulia, RD, LDMason City, IA 504011114245909
  7. Megan Noonan-Conlon, RD, LDMason City, IA 504011538506084
  8. Stephanie Norris, RD, LDMason City, IA 504011750623773

Common questions

What is Joan K. Maertens, RD,LD's NPI number?

Joan K. Maertens, RD,LD's National Provider Identifier (NPI) is 1770623472, issued on Feb 8, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Joan K. Maertens, RD,LD located?

The NPPES record lists a practice address at 910 N Eisenhower Ave, Mason City, IA, 50401. Phone: (641) 422-6443. Providers update this record themselves, so call before visiting.

How can I verify Joan K. Maertens, RD,LD's license?

NPPES lists Iowa license number 30500418, 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.