Dr. John C. Billesdon, MD
- Medicare services, 2018
- 861
- Part D claims, 2019
- 71
- Industry payments
- $270
- Affiliated sites
- 1
- Medical group
- 1
- Practice address
- 2241 Wankel Way, Oxnard, CA 93030
- Practice phone
- Call (805) 983-0521
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Ventura County Gastroenterology Medical Grp Inc
Oxnard, California
Find Dr. Billesdon'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. John C. Billesdon is a gastroenterologist in Oxnard, California
Dr. Billesdon practices at Ventura County Gastroenterology Medical Grp Inc in Oxnard, California.
Dr. Billesdon's NPI, 1184648933, was assigned on July 26, 2006. Dr. Billesdon graduated from Wayne State University School Of Medicine in 1971. Dr. Billesdon's California license number on file is G22785.
- NPI
- 1184648933NPI Registry (opens in a new tab)
- NPI enumeration date
- July 26, 2006
- NPI status
- Active
- Practice phone
- (805) 983-0521
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1971
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. John C. Billesdon practices at Ventura County Gastroenterology Medical Grp Inc in Oxnard, California
Dr. Billesdon's primary practice is Ventura County Gastroenterology Medical Grp Inc, at 2241 Wankel Way, Oxnard, CA 93030 in Ventura County. The practice phone is (805) 983-0521.
- Ventura County Gastroenterology Medical Grp Inc2241 Wankel Way, Oxnard, CA 93030 · Ventura CountyPhone(805) 983-0521
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. John C. Billesdon is affiliated with 2 sites of care and 1 medical group
Dr. Billesdon's primary practice is Ventura County Gastroenterology Medical Grp Inc in Oxnard, California. Dmand AI also links Dr. Billesdon to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. John C. Billesdon's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Billesdon practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ventura County Gastroenterology Medical Grp Inc | Available with a free account |
| +1 more site and 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 each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. John C. Billesdon is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Billesdon's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Billesdon has a license on file in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Billesdon
Counts of gastroenterologists 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. John C. Billesdon billed Medicare for 861 services in 2018
CMS data shows 861 Medicare services from Dr. Billesdon across 9 procedure codes in 2018. Medicare paid $81,866 for them.
Dr. Billesdon's Medicare services by type, 2017 to 2018
- 2017
- 2018
- Office and hospital visits
- 2017: 8952018: 53141%
- Surgery
- 2017: 3122018: 24222%
- Other services
- 2017: 1012018: 8813%
Where Dr. Billesdon's Medicare services took place, 2018
- In an office53162%
- In a facility33038%
Dr. Billesdon compared with the California median for gastroenterologists, 2018
- Dr. Billesdon
- California median
- Medicare services
- 861vs 58647% above
- Part D claims
- 71vs 38081% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Billesdon's most billed Medicare procedure codes, 2018
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Billesdon?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Billesdon and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John C. Billesdon's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Billesdon's median patient age at 69, with 56% women.
Dr. Billesdon's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 69
Patient panel by sex, all payers
- Women56%
- Men44%
Source: Dmand AI Patient Panel Data
Dr. John C. Billesdon wrote 71 Medicare Part D claims in 2019
In 2019, Dr. Billesdon wrote 71 Medicare Part D claims. They cover 3 drugs, with $5,789 in total drug cost. In 2018, CMS named 267 claims across 7 drugs.
Dr. Billesdon's most prescribed drugs by claims, 2019
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 2019
- 2018
- 2019
- Claims for drugs CMS names
- 2018: 2672019: 7173%
Drugs named by CMS: 3 in 2019, 7 in 2018.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. John C. Billesdon received $270 in industry payments from 2016 to 2019
CMS Open Payments shows 17 general payments to Dr. Billesdon from 6 drug and device companies from 2016 to 2019. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $107.
General payments to Dr. Billesdon by program year, 2016 to 2019
Companies that paid Dr. Billesdon the most, 2016 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. John C. Billesdon graduated from Wayne State University School Of Medicine
Dr. Billesdon graduated from Wayne State University School Of Medicine in 1971. Dr. Billesdon is a member of ACP.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. John C. Billesdon accepts plans from 1 insurance carrier
Dr. Billesdon is in network with 1 carrier, including Molina. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Molina
Plan types Dr. Billesdon accepts, by number of carriers
- HMO1
- Medicare1
Source: Dmand AI Insurance Network Data
Sources for Dr. John C. Billesdon'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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) |
| 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. John C. Billesdon
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. John C. Billesdon's NPI number?
Dr. John C. Billesdon's NPI number is 1184648933. It was assigned on July 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John C. Billesdon?
Dr. John C. Billesdon is a gastroenterologist in Oxnard, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. John C. Billesdon practice?
Dr. Billesdon practices at 2241 Wankel Way, Oxnard, CA 93030. Dr. Billesdon's primary practice is Ventura County Gastroenterology Medical Grp Inc in Oxnard, California. Dmand AI also links Dr. Billesdon to 1 group practice or clinic and 1 medical group.
What is Dr. John C. Billesdon's office phone number?
The practice phone on file for Dr. Billesdon is (805) 983-0521.
What is Dr. John C. Billesdon's medical license number?
Dr. Billesdon's California license number on file is G22785.
Does Dr. John C. Billesdon accept Medicare?
Yes. CMS data shows Dr. Billesdon billed Medicare for 861 services in 2018.
What services does Dr. John C. Billesdon bill to Medicare?
In 2018, Dr. Billesdon's most billed Medicare services were office visit, established patient (99213), office visit, established patient (99214) and surgery: digestive system (43239).
Where did Dr. John C. Billesdon go to medical school?
Dr. Billesdon graduated from Wayne State University School Of Medicine in 1971.
What drugs does Dr. John C. Billesdon prescribe most?
In 2019 Medicare Part D data, Dr. Billesdon's most prescribed drugs by claims were Pantoprazole Sodium, Omeprazole and Linzess.
Has Dr. John C. Billesdon received payments from drug or device companies?
CMS Open Payments shows $270 in general payments to Dr. Billesdon from 6 companies from 2016 to 2019. The largest total came from Boston Scientific Corporation.
How long has Dr. John C. Billesdon been practicing?
Dr. Billesdon graduated from medical school in 1971, 55 years ago.
What insurance does Dr. John C. Billesdon accept?
Dr. Billesdon is in network with 1 carrier, including Molina. HMO plans come from the most carriers, 1. Check the plan with the practice before a visit.
Selling to gastroenterology practices?
See gastroenterologists 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