NPPES file of Aug 9, 2026

James Frederick Guenther, D.O.

Addiction Medicine (Internal Medicine) Physician · Lancaster, OH

James Frederick Guenther, D.O. is an addiction medicine (internal medicine) physician with a practice address in Lancaster, Ohio, and NPI 1417933490, issued on Dec 21, 2005. Check the license (Ohio 34.004690, as entered in NPPES) on the State Medical Board of Ohio; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1417933490
Name
James Frederick Guenther
Credential
D.O.
Primary taxonomy
Addiction Medicine (Internal Medicine) Physician 207RA0401X
License number
34.004690 OH
Self-reported in NPPES; status is on the state search
Practice location
1319 E Main St, Lancaster, OH 43130
Phone
(740) 653-9411
Enumerated
Dec 21, 2005
Record last updated
Aug 4, 2023
Fax
(740) 277-6131
Medicaid ID
0733488 OH
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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Also registered at 1319 E Main St

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

  1. Emily Burnette, D.OObstetrics & Gynecology Physician1588927834
  2. Haley Hillyard, NPFamily Nurse Practitioner1972103505
  3. Sean Jerig, M.D.Obstetrics & Gynecology Physician1437479896

Verify James Frederick Guenther in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersState Medical Board of Ohio
    Search for license 34.004690    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 Ohio license search

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90% fewer Medicare Part D claims than the average addiction medicine (internal medicine) physician in 2024

80 Medicare Part D claims for 42 beneficiaries, against an average of 829 among the 401 providers of this specialty who prescribed in Part D.

  1. James Guenther80
  2. Specialty average829

Most prescribed

  1. Buprenorphine-Naloxone21 claims
  2. Naloxone Hcl15 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $28.94

1 payment: food and beverage; the largest payer was Braeburn Inc. The 188 providers of this specialty with any payment received $1,761.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. James Guenther$28.94
  2. Specialty average$1,761.64

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Addiction Medicine (Internal Medicine) Physician providers in Ohio

There are 42 addiction medicine (internal medicine) physician records in Ohio.

All 42 in Ohio → Every provider in Lancaster →

Other addiction medicine (internal medicine) physician records in Ohio

  1. Christopher Adelman, MDCleveland, OH1063499598
  2. Anthony Agra, M.D.Columbus, OH1649279373
  3. David Allen, M.D.Gahanna, OH1538278452
  4. Cynthia Brown, MDCleveland, OH1528051661
  5. Judith Brown, MDWhitehall, OH1407975790
  6. Clifford Cabansag, MDMiddletown, OH1003065905
  7. Jeffrey Craven, M.D.Cincinnati, OH1104821206
  8. Joseph Defranco, M.D.Cleveland, OH1003295221
  9. Cameron Gachett, DOColumbus, OH1093343899
  10. Margie Gerena-Lewis, MDMassillon, OH1801852728

Common questions

What is James Frederick Guenther, D.O.'s NPI number?

James Frederick Guenther, D.O.'s National Provider Identifier (NPI) is 1417933490, issued on Dec 21, 2005. An NPI identifies a provider in billing; it is not a license.

Where is James Frederick Guenther, D.O. located?

The NPPES record lists a practice address at 1319 E Main St, Lancaster, OH, 43130. Phone: (740) 653-9411. Providers update this record themselves, so call before visiting.

How can I verify James Frederick Guenther, D.O.'s license?

NPPES lists Ohio license number 34.004690, as entered by the provider. Search the State Medical Board of Ohio at https://elicense.ohio.gov/oh_verifylicense. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does James Frederick Guenther, D.O. prescribe under Medicare Part D?

In 2024, James Frederick Guenther, D.O. had 80 Medicare Part D claims for 42 beneficiaries; the average among addiction medicine (internal medicine) physician prescribers was 829. Part D covers Medicare prescriptions 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. Medicare files from data.cms.gov. 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.