Dr. John Oostendorp, MD
- Medicare services, 2021
- 353
- Part D claims, 2022
- 1,537
- Hospital affiliations
- 1
- Industry payments
- $90
- State license
- 1
- Practice address
- 8333 Felch St, Zeeland, MI 49464
- Practice phone
- Call (616) 772-4644
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Oostendorp'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 Oostendorp is an internist in Zeeland, Michigan
Dr. Oostendorp practices at Corewell Health Zeeland Hospital in Zeeland, Michigan, part of Corewell Health.
Dr. Oostendorp's NPI, 1790725802, was assigned on June 7, 2006. Dr. Oostendorp holds Michigan license 4301042921.
- NPI
- 1790725802NPI Registry (opens in a new tab)
- NPI enumeration date
- June 7, 2006
- NPI status
- Active
- Practice phone
- (616) 772-4644
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. John Oostendorp practices at Corewell Health Zeeland Hospital in Zeeland, Michigan
Dr. Oostendorp's primary practice is Corewell Health Zeeland Hospital, at 8333 Felch St, Zeeland, MI 49464 in Ottawa County. The practice phone is (616) 772-4644.
- Corewell Health Zeeland Hospital8333 Felch St, Zeeland, MI 49464 · Ottawa CountyPhone(616) 772-4644
Source: Dmand AI Affiliation Data
Dr. John Oostendorp is affiliated with 1 site of care
Dr. Oostendorp's primary practice is Corewell Health Zeeland Hospital in Zeeland, Michigan, part of Corewell Health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. John Oostendorp's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Oostendorp practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Corewell Health Zeeland Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. John Oostendorp is one of 4,804 internists in Michigan
Internal medicine is Dr. Oostendorp's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Oostendorp is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. Oostendorp
Counts of internists 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 Oostendorp billed Medicare for 353 services in 2021
CMS data shows 353 Medicare services from Dr. Oostendorp across 8 procedure codes in 2021. Medicare paid $16,928 for them. Every service was in an office.
Dr. Oostendorp's Medicare services by type, 2020 to 2021
- 2020
- 2021
- Office and hospital visits
- 2020: 1982021: 17611%
- Other services
- 2020: 832021: 11437%
- Tests and treatments
- 2020: 642021: 3545%
- Lab and pathology
- 2020: 232021: 2822%
Dr. Oostendorp compared with the Michigan median for internists, 2021
- Dr. Oostendorp
- Michigan median
- Medicare services
- 353vs 42317% below
- Part D claims
- 1,537vs 3144.9 times
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. Oostendorp's most billed Medicare procedure codes, 2021
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. Oostendorp?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Oostendorp and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. John Oostendorp's patients have a median age of 69
Across all payers, Dmand AI patient panel data puts Dr. Oostendorp's median patient age at 69, with 41% women.
Dr. Oostendorp'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
- Women41%
- Men59%
Source: Dmand AI Patient Panel Data
Dr. John Oostendorp wrote 1,537 Medicare Part D claims in 2022
In 2022, Dr. Oostendorp wrote 1,537 Medicare Part D claims. They cover 43 drugs, with $123,414 in total drug cost. In 2021, CMS named 9,406 claims across 147 drugs.
Dr. Oostendorp's most prescribed drugs by claims, 2022
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, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 9,4062022: 1,53784%
Drugs named by CMS: 43 in 2022, 147 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. John Oostendorp received $90 in industry payments from 2016 to 2021
CMS Open Payments shows 6 general payments to Dr. Oostendorp from 3 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 100% of the total. Novo Nordisk Inc paid the most, $62.
General payments to Dr. Oostendorp by program year, 2016 to 2021
Companies that paid Dr. Oostendorp the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. John Oostendorp'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 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) |
| 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 Oostendorp
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 Oostendorp's NPI number?
Dr. John Oostendorp's NPI number is 1790725802. It was assigned on June 7, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. John Oostendorp?
Dr. John Oostendorp is an internist in Zeeland, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. John Oostendorp practice?
Dr. Oostendorp practices at 8333 Felch St, Zeeland, MI 49464. Dr. Oostendorp's primary practice is Corewell Health Zeeland Hospital in Zeeland, Michigan, part of Corewell Health.
What is Dr. John Oostendorp's office phone number?
The practice phone on file for Dr. Oostendorp is (616) 772-4644.
What is Dr. John Oostendorp's medical license number?
Dr. Oostendorp holds Michigan license 4301042921.
Which hospitals is Dr. John Oostendorp affiliated with?
Dr. Oostendorp practices at Corewell Health Zeeland Hospital in Zeeland, Michigan.
Does Dr. John Oostendorp accept Medicare?
Yes. CMS data shows Dr. Oostendorp billed Medicare for 353 services in 2021.
What services does Dr. John Oostendorp bill to Medicare?
In 2021, Dr. Oostendorp's most billed Medicare services were office visit, established patient (99214), medicare service (G0439) and office visit, established patient (99213).
What drugs does Dr. John Oostendorp prescribe most?
In 2022 Medicare Part D data, Dr. Oostendorp's most prescribed drugs by claims were Atorvastatin Calcium, Lisinopril and Amlodipine Besylate.
Has Dr. John Oostendorp received payments from drug or device companies?
CMS Open Payments shows $90 in general payments to Dr. Oostendorp from 3 companies from 2016 to 2021. The largest total came from Novo Nordisk Inc.
How long has Dr. John Oostendorp been practicing?
Dr. Oostendorp's NPI was assigned in 2006.
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