Dr. Timothy Guenther, MD
- Part D claims, 2021
- 31
- Publications
- 22
- Clinical trials
- 10
- Hospital affiliations
- 1
- Industry payments
- $5,284
- Practice address
- 1200 B Gale Wilson Blvd, Fairfield, CA 94533
- Practice phone
- Call (707) 646-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Guenther's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Timothy Guenther is a general surgeon in Fairfield, California
Dr. Guenther practices at NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare.
Dr. Guenther's NPI, 1003261892, was assigned on April 28, 2016. Dr. Guenther graduated from UNMC in 2016. Dr. Guenther holds California license 151538.
- NPI
- 1003261892NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7113309063
- NPI enumeration date
- April 28, 2016
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (707) 646-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Timothy Guenther practices at NorthBay Medical Center in Fairfield, California
Dr. Guenther's primary practice is NorthBay Medical Center, at 1200 B Gale Wilson Blvd, Fairfield, CA 94533 in Solano County. The practice phone is (707) 646-5000.
- NorthBay Medical Center1200 B Gale Wilson Blvd, Fairfield, CA 94533 · Solano CountyPhone(707) 646-5000
Source: Dmand AI Affiliation Data
Dr. Timothy Guenther is affiliated with 1 site of care and 2 medical groups
Dr. Guenther's primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. The medical group on file is NorthBay Medical Center. Dmand AI also links Dr. Guenther to 1 more medical group, named with a free account. Dr. Guenther's employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Timothy Guenther's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Guenther practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| NorthBay Medical Center | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across NorthBay Healthcare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Timothy Guenther is one of 2,926 general surgeons in California
Surgery is Dr. Guenther's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Guenther is board certified in surgery by the American Board of Surgery. Dmand AI has Dr. Guenther's licenses on file in 3 states: California, Nebraska and Wisconsin.
Specialties and state licenses
- Surgery, CaliforniaPrimary
- Student in an organized health care education/training program, Nebraska
- Wisconsin license
General surgeons near Dr. Guenther
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Timothy Guenther's patients have a median age of 60
Across all payers, Dmand AI patient panel data puts Dr. Guenther's median patient age at 60, with 20% women.
Dr. Guenther's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 60
Patient panel by sex, all payers
- Women20%
- Men75%
Source: Dmand AI Patient Panel Data
Dr. Timothy Guenther wrote 31 Medicare Part D claims in 2021
In 2021, Dr. Guenther wrote 31 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $87 in total drug cost. In 2018, CMS named 12 claims across 1 drug.
Dr. Guenther's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2018 to 2021
- 2018
- 2021
- Claims for drugs CMS names
- 2018: 122021: 31158%
Drugs named by CMS: 1 in 2021, 1 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
How Dr. Timothy Guenther takes part in Medicare
Dr. Guenther accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Timothy Guenther has 22 publications on record
Dmand AI links 22 papers to Dr. Guenther, published from 2019 to 2024. 2020 was the busiest year, with 8. The most frequent topics are Coronary Vessel Anomalies, Pulmonary Artery and Cardiac Surgical Procedures. Dr. Guenther has published most often in Mil Med. Dr. Guenther's most frequent co-authors are Curtis Jay Wozniak, MD, Joshua D. Gustafson, MD and Gary W. Raff, MD.
Dr. Guenther's papers by year, 2019 to 2024
Topics Dr. Guenther writes about most
- Coronary Vessel Anomalies
- Pulmonary Artery
- Cardiac Surgical Procedures
- Career Choice
- Coronary Angiography
- Coronary Artery Disease
- Military Medicine
- Schools, Medical
Dr. Guenther's most frequent co-authors
- Curtis Jay Wozniak, MD7 shared papers
- Joshua D. Gustafson, MD6 shared papers
- Gary W. Raff, MD5 shared papers
Recent publications by Dr. Guenther
J Thorac Cardiovasc Surg
Cardiol Young
See who Dr. Guenther researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Guenther works with, so you can find a warm path to the right general surgeons.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Timothy Guenther has worked on 10 clinical trials
Dmand AI links Dr. Guenther to 10 clinical trials, 4 of them phase 2 studies. 9 are still active or recruiting. Conditions studied include Adenocarcinoma of Lung, Biliary Atresia and Low Back Pain.
Clinical trials with Dr. Guenther by phase
- NonePhase 1: no trials
- 4Phase 2: 4 trials
- 1Phase 2/3: 1 trial
- NonePhase 3: no trials
- NonePhase 4: no trials
Trials with no phase (devices, behavioral studies) are left out.
Conditions in Dr. Guenther's trials
- Adenocarcinoma of Lung
- Biliary Atresia
- Low Back Pain
- Malocclusion
- Muscular Atrophy
Investigators on the most trials with Dr. Guenther
- Kader Tawfiq Abdelerahman, MD10 shared trials
- Randa Abdelmasih, MD10 shared trials
- Marjorie E. Affel, MD10 shared trials
Recent clinical trials with Dr. Guenther
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Timothy Guenther received $5,284 in industry payments from 2017 to 2025
CMS Open Payments shows 42 general payments to Dr. Guenther from 8 drug and device companies from 2017 to 2025. Travel and lodging make up the largest share, 59% of the total. AtriCure, Inc. paid the most, $2,659.
General payments to Dr. Guenther by program year, 2017 to 2025
General payments to Dr. Guenther by kind, 2017 to 2025
- Travel and lodging$3,11259%
- Food and beverage$1,62931%
- Education$54310%
Companies that paid Dr. Guenther the most, 2017 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Timothy Guenther graduated from UNMC
Dr. Guenther graduated from UNMC in 2016.
- Medical school
- Board certified in surgery
Source: Dmand AI Professional Profile Data
Dr. Timothy Guenther accepts plans from 1 insurance carrier
Dr. Guenther is in network with 1 carrier, including WI State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
- WI State Medicaid
Source: Dmand AI Insurance Network Data
Sources for Dr. Timothy Guenther's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Timothy Guenther
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Timothy Guenther's NPI number?
Dr. Timothy Guenther's NPI number is 1003261892. It was assigned on April 28, 2016, and it is active in the NPI Registry.
What kind of doctor is Dr. Timothy Guenther?
Dr. Timothy Guenther is a general surgeon in Fairfield, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Timothy Guenther practice?
Dr. Guenther practices at 1200 B Gale Wilson Blvd, Fairfield, CA 94533. Dr. Guenther's primary practice is NorthBay Medical Center in Fairfield, California, part of NorthBay Healthcare. Dmand AI also links Dr. Guenther to 1 medical group.
What is Dr. Timothy Guenther's office phone number?
The practice phone on file for Dr. Guenther is (707) 646-5000.
What is Dr. Timothy Guenther's medical license number?
Dr. Guenther holds California license 151538, one of the licenses on file in 3 states.
Which states has Dr. Timothy Guenther been licensed in?
Dmand AI has state licenses on file for Dr. Guenther in California (2017 to 2027), Nebraska and Wisconsin (2022 to 2025).
Which hospitals is Dr. Timothy Guenther affiliated with?
Dr. Guenther practices at NorthBay Medical Center in Fairfield, California.
What medical group is Dr. Timothy Guenther part of?
Dr. Guenther is linked to NorthBay Medical Center. Dmand AI links Dr. Guenther to 1 more medical group.
Does Dr. Timothy Guenther accept Medicare?
Yes. CMS lists Dr. Guenther as accepting Medicare assignment.
Is Dr. Timothy Guenther board certified?
Yes. Dr. Guenther is board certified in surgery by the American Board of Surgery.
Show 7 more questionsShow fewer questions
Where did Dr. Timothy Guenther go to medical school?
Dr. Guenther graduated from UNMC in 2016.
What drugs does Dr. Timothy Guenther prescribe most?
In 2021 Medicare Part D data, Dr. Guenther's most prescribed drugs by claims were Oxycodone HCl.
Has Dr. Timothy Guenther received payments from drug or device companies?
CMS Open Payments shows $5,284 in general payments to Dr. Guenther from 8 companies from 2017 to 2025. The largest total came from AtriCure, Inc.
How long has Dr. Timothy Guenther been practicing?
Dr. Guenther graduated from medical school in 2016, 10 years ago.
Does Dr. Timothy Guenther do research?
Dmand AI links 22 publications to Dr. Guenther, published from 2019 to 2024. Dr. Guenther has worked on 10 clinical trials.
Who does Dr. Timothy Guenther publish with?
Dr. Guenther's most frequent co-authors are Curtis Jay Wozniak, MD (7 shared papers), Joshua D. Gustafson, MD (6 shared papers) and Gary W. Raff, MD (5 shared papers).
What insurance does Dr. Timothy Guenther accept?
Dr. Guenther is in network with 1 carrier, including WI State Medicaid. Medicaid plans come from the most carriers, 1. Check the plan with the practice before a visit.
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