J Clin Gastroenterol
Esophageal Sphincter, LowerEsophagogastric JunctionGastroesophageal Reflux
Dr. Tom Ryan Demeester, MD
NPI1902837289
- Publications
- 26
- Industry payments
- $306,850
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 1510 San Pablo St, Los Angeles, CA 90033-5324
- Practice phone
- Call (323) 442-5910
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Usc Surgeons
Surgical practice · Los Angeles, California
Find Dr. Demeester'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. Tom Ryan Demeester is a general surgeon in Los Angeles, California
Dr. Demeester practices at Usc Surgeons in Los Angeles, California.
Dr. Demeester's NPI, 1902837289, was assigned on July 5, 2006. Dr. Demeester holds California license C42820.
NPI and contact details
- NPI
- 1902837289NPI Registry (opens in a new tab)
- NPI enumeration date
- July 5, 2006
- NPI status
- Active
- Practice phone
- (323) 442-5910
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Tom Ryan Demeester practices at Usc Surgeons in Los Angeles, California
Dr. Demeester's primary practice is Usc Surgeons, at 1510 San Pablo St, Los Angeles, CA 90033-5324. The practice phone is (323) 442-5910.
- Usc Surgeons1510 San Pablo St, Los Angeles, CA 90033-5324Phone(323) 442-5910
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Tom Ryan Demeester is affiliated with 1 site of care and 1 medical group
Dr. Demeester's primary practice is Usc Surgeons in Los Angeles, California. Dmand AI also links Dr. Demeester to 1 medical group, named with a free account.
Usc SurgeonsPrimary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Tom Ryan Demeester's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Demeester practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Usc Surgeons | Available with a free account |
| +1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
See the EHR and IT leaders at every site where Dr. Demeester practices
Dmand AI maps EHR vendors, IT decision makers and buying committees across each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Tom Ryan Demeester is one of 2,926 general surgeons in California
Surgery is Dr. Demeester's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Demeester is licensed in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
General surgeons near Dr. Demeester
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. Tom Ryan Demeester's patients have a median age of 52
Across all payers, Dmand AI patient panel data puts Dr. Demeester's median patient age at 52, with 100% women.
Dr. Demeester's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 52
Patient panel by sex, all payers
- Women100%
- Men0%
Source: Dmand AI Patient Panel Data
Dr. Tom Ryan Demeester has 26 publications on record
Dmand AI links 26 papers to Dr. Demeester, published from 2010 to 2022. 2012 was the busiest year, with 5. The most frequent topics are Esophageal Neoplasms, Gastroesophageal Reflux and Adenocarcinoma. Dr. Demeester has published most often in Ann Surg. Dr. Demeester's most frequent co-authors are Steven Ryan Demeester, MD, Christina L. Greene, MD and Stephanie Worrell, MD.
Papers26
Years published2010 to 2022
Dr. Demeester's papers by year, 2010 to 2022
Topics Dr. Demeester writes about most
- Esophageal Neoplasms
- Gastroesophageal Reflux
- Adenocarcinoma
- Barrett Esophagus
- Esophagectomy
- Esophagus
- Esophagogastric Junction
- Hernia, Hiatal
Dr. Demeester's most frequent co-authors
- Steven Ryan Demeester, MD10 shared papers
- Christina L. Greene, MD6 shared papers
- Stephanie Worrell, MD6 shared papers
Recent publications by Dr. Demeester
Langenbecks Arch Surg
AdenocarcinomaEsophageal NeoplasmsEsophagectomy
J Gastrointest Surg
AdenocarcinomaBarrett EsophagusEsophageal Neoplasms
Ann Thorac Surg
Anastomosis, SurgicalColonEsophageal Neoplasms
See who Dr. Demeester researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Demeester 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. Tom Ryan Demeester received $306,850 in industry payments from 2016 to 2019
CMS Open Payments shows 172 general payments to Dr. Demeester from 8 drug and device companies from 2016 to 2019. Consulting fees make up the largest share, 49% of the total. Ethicon Inc. paid the most, $218,258. It also lists 1 research payment totaling $10,047 in 2018.
General payments to Dr. Demeester by program year, 2016 to 2019
General payments to Dr. Demeester by kind, 2016 to 2019
$306.9Kin total
- Consulting fees$149,20549%
- Speaker and faculty fees$117,40038%
- Travel and lodging$34,09411%
- Food and beverage$6,1022%
- Entertainment$480%
Companies that paid Dr. Demeester the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Tom Ryan Demeester'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 DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Tom Ryan Demeester
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. Tom Ryan Demeester's NPI number?
Dr. Tom Ryan Demeester's NPI number is 1902837289. It was assigned on July 5, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Tom Ryan Demeester?
Dr. Tom Ryan Demeester is a general surgeon in Los Angeles, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Tom Ryan Demeester practice?
Dr. Demeester practices at 1510 San Pablo St, Los Angeles, CA 90033-5324. Dr. Demeester's primary practice is Usc Surgeons in Los Angeles, California. Dmand AI also links Dr. Demeester to 1 medical group.
What is Dr. Tom Ryan Demeester's office phone number?
The practice phone on file for Dr. Demeester is (323) 442-5910.
What is Dr. Tom Ryan Demeester's medical license number?
Dr. Demeester holds California license C42820.
Has Dr. Tom Ryan Demeester received payments from drug or device companies?
CMS Open Payments shows $306,850 in general payments to Dr. Demeester from 8 companies from 2016 to 2019. The largest total came from Ethicon Inc.
How long has Dr. Tom Ryan Demeester been practicing?
Dr. Demeester's NPI was assigned in 2006.
Does Dr. Tom Ryan Demeester do research?
Dmand AI links 26 publications to Dr. Demeester, published from 2010 to 2022.
Who does Dr. Tom Ryan Demeester publish with?
Dr. Demeester's most frequent co-authors are Steven Ryan Demeester, MD (10 shared papers), Christina L. Greene, MD (6 shared papers) and Stephanie Worrell, MD (6 shared papers).
Selling to surgery practices?
See general surgeons in California by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card