NPPES file of Aug 9, 2026

Frederick C. Gremmels, D.O.

Family Medicine Physician · Watertown, WI

Frederick C. Gremmels, D.O. is a family medicine physician with a practice address in Watertown, Wisconsin, and NPI 1720156896, issued on Nov 30, 2006. Check the license (Wisconsin 20398, as entered in NPPES) on the Wisconsin Medical Examining Board; 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
1720156896
Name
Frederick C. Gremmels
Credential
D.O.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
20398 WI
Self-reported in NPPES; status is on the state search
Practice location
127 Hospital Dr, Watertown, WI 53098
Phone
(920) 261-8500
Enumerated
Nov 30, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicaid ID
30036200 WI
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 family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →

Also registered at 127 Hospital Dr

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

  1. John Basarich, MDFamily Medicine Physician1033178512
  2. Bruce Cochrane, M.D.Family Medicine Physician1922176064
  3. Melodie Defouw, APNPFamily Nurse Practitioner1881164481
  4. Alyssa Flagge, PA-CPhysician Assistant1356074512
  5. Richard Holden, M.D.Family Medicine Physician1215005368
  6. Robert Legrow, M.D.Family Medicine Physician1013908771

Verify Frederick C. Gremmels in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 20398    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
Open 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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Frederick C. Gremmels among 3,765 family medicine physician records in Wisconsin

Frederick C. Gremmels, D.O. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% 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 10% of them.

  • NPI issued2006 · 10% of these records are older, 46% newer
  • In a Medicare fileNo · 75% of these records are
  • In the CMS Doctors and Clinicians fileNo · 62% of these records are
  • Record last updated2007 · 56% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

13 family medicine physician records list a practice address in Watertown

They are 13 of the 366 NPPES records with a practice address in Watertown, and 3,765 family medicine physician records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 3,765 in Wisconsin → Every provider in Watertown → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. John Basarich, MDWatertown, WI 530981033178512
  2. Bruce Cochrane, M.D.Watertown, WI 530981922176064
  3. Leslie Golden, MDWatertown, WI 530981336401736
  4. Richard Holden, M.D.Watertown, WI 530981215005368
  5. Robert Legrow, M.D.Watertown, WI 530981013908771
  6. Anna Stamas, DOWatertown, WI 530981376172007
  7. Michael Sullivan, M.D.Watertown, WI 530981093883142
  8. Danielle Tonelli, DOWatertown, WI 530981083806814

Common questions

What is Frederick C. Gremmels, D.O.'s NPI number?

Frederick C. Gremmels, D.O.'s National Provider Identifier (NPI) is 1720156896, issued on Nov 30, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Frederick C. Gremmels, D.O. located?

The NPPES record lists a practice address at 127 Hospital Dr, Watertown, WI, 53098. Phone: (920) 261-8500. Providers update this record themselves, so call before visiting.

How can I verify Frederick C. Gremmels, D.O.'s license?

NPPES lists Wisconsin license number 20398, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

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.