NPPES file of Aug 9, 2026

Olivia Carol Letter

Certified Registered Nurse Anesthetist · Oshkosh, WI

Olivia Carol Letter is a certified registered nurse anesthetist with a practice address in Oshkosh, Wisconsin, and NPI 1598583197, issued on Oct 1, 2024. Check the license (Wisconsin 161098, 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
1598583197
Name
Olivia Carol Letter
Primary taxonomy
Certified Registered Nurse Anesthetist 367500000X
License number
161098 WI
Self-reported in NPPES; status is on the state search
Practice location
800 Algoma Blvd, Oshkosh, WI 54901
Phone
(920) 424-1077
Enumerated
Oct 1, 2024
Record last updated
May 26, 2026
Medicare enrollment
Enrolled (PECOS I20260603000957); may accept Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest certified registered nurse anesthetist records → All 1,241 in Wisconsin → Look up another NPI →

Also registered at 800 Algoma Blvd

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

  1. Peter AltschwagerAthletic Trainer1669840112
  2. Alissa ArnesonFamily Nurse Practitioner1417886185
  3. Sara BrochtrupCertified Registered Nurse Anesthetist1871467522
  4. Tyler BuzzardCertified Registered Nurse Anesthetist1699594887
  5. Kimberly Calvert, MS, ATC, NASM-PESAthletic Trainer1487798625
  6. Marijo EversCertified Registered Nurse Anesthetist1104644814

Verify Olivia Carol Letter 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 161098    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

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Olivia Carol Letter among 1,241 certified registered nurse anesthetist records in Wisconsin

Olivia Carol Letter is one of 1,241 certified registered nurse anesthetist records with a practice address in Wisconsin. 76% 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 2024, is newer than 95% of them.

  • NPI issued2024 · 95% of these records are older, 3% newer
  • In a Medicare fileNo · 76% of these records are
  • In the CMS Doctors and Clinicians fileYes · 75% of these records are
  • Graduated2026 · median 2013 among the 932 with a school on file
  • Record last updated2026 · 48% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 367500000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

43 certified registered nurse anesthetist records list a practice address in Oshkosh

They are 43 of the 1,527 NPPES records with a practice address in Oshkosh, and 1,241 certified registered nurse anesthetist records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,241 in Wisconsin → Every provider in Oshkosh → Certified Registered Nurse Anesthetist nationwide →

The 8 certified registered nurse anesthetist records with the nearest ZIP codes

  1. Sara BrochtrupOshkosh, WI 549011871467522
  2. Tyler BuzzardOshkosh, WI 549011699594887
  3. Marijo EversOshkosh, WI 549011104644814
  4. Dylan Hamilton, REGISTERED NURSEOshkosh, WI 549011124800362
  5. Craig Tokach, CRNAOshkosh, WI 549011982669412
  6. Shalyn TreptowOshkosh, WI 549011316766504
  7. Jamie DavisOshkosh, WI 549021043091572
  8. John Berg, CRNA APNPOshkosh, WI 549041407838824

Common questions

What is Olivia Carol Letter's NPI number?

Olivia Carol Letter's National Provider Identifier (NPI) is 1598583197, issued on Oct 1, 2024. An NPI identifies a provider in billing; it is not a license.

Where is Olivia Carol Letter located?

The NPPES record lists a practice address at 800 Algoma Blvd, Oshkosh, WI, 54901. Phone: (920) 424-1077. Providers update this record themselves, so call before visiting.

How can I verify Olivia Carol Letter's license?

NPPES lists Wisconsin license number 161098, 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.