NPPES file of Aug 9, 2026

Nan Olson, RD CD

Registered Dietitian · Madison, WI

Nan Olson, RD CD is a registered dietitian with a practice address in Madison, Wisconsin, and NPI 1255392155, issued on Mar 30, 2006. Check the license (Wisconsin 858, as entered in NPPES) with the Wisconsin 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
1255392155
Name
Nan Olson
Credential
RD CD
Primary taxonomy
Registered Dietitian 133V00000X
License number
858 WI
Self-reported in NPPES; status is on the state search
Practice location
20 S Park St, Madison, WI 53715
Phone
(608) 287-2780
Enumerated
Mar 30, 2006
Record last updated
Apr 29, 2009 (not updated in 17 years: call before relying on the address or phone)
Fax
(608) 287-2777
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 1,457 in Wisconsin → Look up another NPI →

Also registered at 20 S Park St

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

  1. Luke Addesso, MDPediatrics Physician1013470186
  2. Mackenzie Asel, M.D.Dermatology Physician1831538099
  3. Elizabeth Bartholomew, LCSWClinical Social Worker1679851398
  4. Sarah Benedict, NPNurse Practitioner1336648039
  5. Eliza Bennett, M.D.Obstetrics & Gynecology Physician1003852161
  6. Stephen Bernsten, MDPlastic Surgery Physician1114989043

Verify Nan Olson in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Wisconsin board licenses this profession
    Search for license 858    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 Wisconsin 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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Nan Olson among 1,457 registered dietitian records in Wisconsin

Nan Olson, RD CD is one of 1,457 registered dietitian records with a practice address in Wisconsin. 12% 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 2006, is newer than 3% of them.

  • NPI issued2006 · 3% of these records are older, 84% newer
  • In a Medicare fileNo · 12% of these records are
  • In the CMS Doctors and Clinicians fileNo · 13% of these records are
  • Record last updated2009 · 63% 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 Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

215 registered dietitian records list a practice address in Madison

They are 215 of the 15,014 NPPES records with a practice address in Madison, and 1,457 registered dietitian records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,457 in Wisconsin → Every provider in Madison → Registered Dietitian nationwide →

The 8 registered dietitian records with the nearest ZIP codes

  1. Janice Antoniewicz-Werner, CDMadison, WI 537151790741288
  2. Melody Cole, MS RD CDMadison, WI 537151568421642
  3. Carly Degrood, RDMadison, WI 537151851409551
  4. Dana Evans, MS, RDMadison, WI 537151144383365
  5. Tammy Fumusa, RDMadison, WI 537151033277645
  6. Diana Pederson, RDCDMadison, WI 537151578747630
  7. Kim Petershack, CDMadison, WI 537151346206323
  8. Melissa Phillips, RDMadison, WI 537151194857805

Common questions

What is Nan Olson, RD CD's NPI number?

Nan Olson, RD CD's National Provider Identifier (NPI) is 1255392155, issued on Mar 30, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Nan Olson, RD CD located?

The NPPES record lists a practice address at 20 S Park St, Madison, WI, 53715. Phone: (608) 287-2780. Providers update this record themselves, so call before visiting.

How can I verify Nan Olson, RD CD's license?

NPPES lists Wisconsin license number 858, as entered by the provider. Search the Wisconsin 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.