Dr. Derek Conner Westman, DO
- Medicare services, 2024
- 239
- Medicare patients, 2024
- 100
- Part D claims, 2024
- 333
- Hospital affiliations
- 1
- Industry payments
- $130
- Practice address
- 1234 Napier Avenue, Saint Joseph, MI 49085
- Practice phone
- Call (269) 983-8300
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. Derek Conner Westman is an internist in Saint Joseph, Michigan
Dr. Westman practices at Corewell Health Lakeland Hospitals - Saint Joseph Hospital in Saint Joseph, Michigan, part of Corewell Health.
Dr. Westman's NPI, 1982283065, was assigned on April 6, 2021. Dr. Westman holds Michigan license 5101027971.
- NPI
- 1982283065NPI Registry (opens in a new tab)
- Medicare PAC ID
- 5991249070
- NPI enumeration date
- April 6, 2021
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (269) 983-8300
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 31
- Medical school graduation
- 2021
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Derek Conner Westman practices at Corewell Health Lakeland Hospitals - Saint Joseph Hospital in Saint Joseph, Michigan
Dr. Westman's primary practice is Corewell Health Lakeland Hospitals - Saint Joseph Hospital, at 1234 Napier Avenue, Saint Joseph, MI 49085 in Berrien County. The practice phone is (269) 983-8300.
- Corewell Health Lakeland Hospitals - Saint Joseph Hospital1234 Napier Avenue, Saint Joseph, MI 49085 · Berrien CountyPhone(269) 983-8300
Source: Dmand AI Affiliation Data
Dr. Derek Conner Westman is affiliated with 1 site of care and 1 medical group
Dr. Westman's primary practice is Corewell Health Lakeland Hospitals - Saint Joseph Hospital in Saint Joseph, Michigan, part of Corewell Health. The medical group on file is Corewell Health Medical Group South.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Derek Conner Westman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Westman practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Corewell Health Lakeland Hospitals - Saint Joseph Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Derek Conner Westman is one of 4,804 internists in Michigan
Internal medicine is Dr. Westman's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Westman is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. Westman
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. Derek Conner Westman billed Medicare for 239 services in 2024
CMS data shows 239 Medicare services from Dr. Westman across 3 procedure codes in 2024, for 100 Medicare patients. Medicare paid $15,316 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Westman compared with the Michigan median for internists, 2024
- Dr. Westman
- Michigan median
- Medicare services
- 239vs 42343% below
- Medicare patients
- 100vs 15937% below
- Part D claims
- 106vs 31466% below
Medians across 4,524 internists in Michigan with Dmand AI profiles that report each measure.
Dr. Westman's most billed Medicare procedure codes, 2024
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. Westman?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Westman and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Derek Conner Westman treated 100 Medicare patients in 2024, average age 76
CMS counts 100 Medicare patients who saw Dr. Westman in 2024. The largest group is 75 to 84, with 31 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 25% are also on Medicaid. Their average risk score is 2.08, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Westman's median patient age at 69, with 53% women.
Dr. Westman's Medicare patients by age, 2024
Dr. Westman's Medicare patients by sex, 2024
- Women4949%
- Men5151%
Chronic conditions among Dr. Westman's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis54%
- Diabetes54%
- Chronic kidney disease53%
- Ischemic heart disease47%
- Heart failure42%
- Mood disorders42%
Share of Medicare patients with each condition. A patient can have several.
Dr. Westman'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
- Women53%
- Men46%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Derek Conner Westman wrote 333 Medicare Part D claims in 2024
In 2024, Dr. Westman wrote 333 Medicare Part D claims for 97 patients. 77% of them were for generic drugs. CMS names the drug for 106 of them, across 8 drugs with 11 or more claims each, at $14,264 in total drug cost.
Dr. Westman's Part D claims by kind of drug, 2024
- Generic258 claims77%
- Brand-name75 claims23%
Dr. Westman's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Westman's Part D claims, 2024
- Opioids4%13 of 333 claims
- Antibiotics6%19 of 333 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Derek Conner Westman takes part in Medicare
Dr. Westman 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. Derek Conner Westman received $130 in industry payments in 2024
CMS Open Payments shows 1 general payment to Dr. Westman from 1 drug or device company in 2024. Food and beverage make up the largest share, 100% of the total. AstraZeneca Pharmaceuticals LP paid the most, $130.
Companies that paid Dr. Westman the most, 2024 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Derek Conner Westman'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 DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (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) |
| 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. Derek Conner Westman
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. Derek Conner Westman's NPI number?
Dr. Derek Conner Westman's NPI number is 1982283065. It was assigned on April 6, 2021, and it is active in the NPI Registry.
What kind of doctor is Dr. Derek Conner Westman?
Dr. Derek Conner Westman is an internist in Saint Joseph, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Derek Conner Westman practice?
Dr. Westman practices at 1234 Napier Avenue, Saint Joseph, MI 49085. Dr. Westman's primary practice is Corewell Health Lakeland Hospitals - Saint Joseph Hospital in Saint Joseph, Michigan, part of Corewell Health.
What is Dr. Derek Conner Westman's office phone number?
The practice phone on file for Dr. Westman is (269) 983-8300.
What is Dr. Derek Conner Westman's medical license number?
Dr. Westman holds Michigan license 5101027971, one of 2 state licenses on file.
Which hospitals is Dr. Derek Conner Westman affiliated with?
Dr. Westman practices at Corewell Health Lakeland Hospitals - Saint Joseph Hospital in Saint Joseph, Michigan.
What medical group is Dr. Derek Conner Westman part of?
Dr. Westman is linked to Corewell Health Medical Group South.
Does Dr. Derek Conner Westman accept Medicare?
Yes. CMS data shows Dr. Westman billed Medicare for 239 services in 2024, and Dr. Westman accepts Medicare assignment.
How many Medicare patients does Dr. Derek Conner Westman see?
CMS counts 100 Medicare patients who saw Dr. Westman in 2024, with an average age of 76.
What services does Dr. Derek Conner Westman bill to Medicare?
In 2024, Dr. Westman's most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99238) and hospital inpatient care (99222).
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What drugs does Dr. Derek Conner Westman prescribe most?
In 2024 Medicare Part D data, Dr. Westman's most prescribed drugs by claims were Albuterol Sulfate Hfa, Pantoprazole Sodium and Metformin HCl.
Has Dr. Derek Conner Westman received payments from drug or device companies?
CMS Open Payments shows $130 in general payments to Dr. Westman from 1 company from 2024 to 2024. The largest total came from AstraZeneca Pharmaceuticals LP.
How long has Dr. Derek Conner Westman been practicing?
Dr. Westman graduated from medical school in 2021, 5 years ago.
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