Dr. Thomas Barker, MD
- Part D claims, 2024
- 346
- Hospital affiliations
- 2
- Industry payments
- $489
- State license
- 1
- Year NPI issued
- 2023
- Practice address
- 2900 Collins Road, Lansing, MI 48910
- Practice phone
- Call (517) 975-5600
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Barker'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. Thomas Barker is an internist in Lansing, Michigan
Dr. Barker practices at McLaren Greater Lansing in Lansing, Michigan, part of McLaren Health Care.
Dr. Barker's NPI, 1497448773, was assigned on June 1, 2023. Dr. Barker holds Michigan license 4301517962.
- NPI
- 1497448773NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9133587561
- NPI enumeration date
- June 1, 2023
- NPI status
- Active
- Practice phone
- (517) 975-5600
- 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. Thomas Barker practices at McLaren Greater Lansing in Lansing, Michigan
Dr. Barker's primary practice is McLaren Greater Lansing, at 2900 Collins Road, Lansing, MI 48910 in Ingham County. The practice phone is (517) 975-5600.
- McLaren Greater Lansing2900 Collins Road, Lansing, MI 48910 · Ingham CountyPhone(517) 975-5600
Source: Dmand AI Affiliation Data
Dr. Thomas Barker is affiliated with 3 sites of care
Dr. Barker's primary practice is McLaren Greater Lansing in Lansing, Michigan, part of McLaren Health Care. Dmand AI also links Dr. Barker to 1 hospital and 1 clinical lab, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Thomas Barker's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Barker practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| McLaren Greater Lansing | Available with a free account |
| +2 more affiliated sites | 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 McLaren Health Care and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Thomas Barker is one of 4,804 internists in Michigan
Internal medicine is Dr. Barker's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Barker is licensed in Michigan.
Specialties and state licenses
- Internal medicine, MichiganPrimary
Internists near Dr. Barker
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. Thomas Barker's patients have a median age of 64
Across all payers, Dmand AI patient panel data puts Dr. Barker's median patient age at 64, with 38% women.
Dr. Barker's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 64
Patient panel by sex, all payers
- Women38%
- Men63%
Source: Dmand AI Patient Panel Data
Dr. Thomas Barker wrote 346 Medicare Part D claims in 2024
In 2024, Dr. Barker wrote 346 Medicare Part D claims for 80 patients. 90% of them were for generic drugs.
Dr. Barker's Part D claims by kind of drug, 2024
- Generic312 claims90%
- Brand-name34 claims10%
Drug classes CMS tracks in Dr. Barker's Part D claims, 2024
- Opioids12%40 of 346 claims
- Antibiotics6%20 of 346 claims
- Antipsychotics, patients 65 and over5%16 of 346 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Thomas Barker received $489 in industry payments in 2025
CMS Open Payments shows 4 general payments to Dr. Barker from 4 drug and device companies in 2025. Food and beverage make up the largest share, 100% of the total. Verona Pharma, Inc. paid the most, $146.
Companies that paid Dr. Barker the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Thomas Barker'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 (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. Thomas Barker
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. Thomas Barker's NPI number?
Dr. Thomas Barker's NPI number is 1497448773. It was assigned on June 1, 2023, and it is active in the NPI Registry.
What kind of doctor is Dr. Thomas Barker?
Dr. Thomas Barker is an internist in Lansing, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Thomas Barker practice?
Dr. Barker practices at 2900 Collins Road, Lansing, MI 48910. Dr. Barker's primary practice is McLaren Greater Lansing in Lansing, Michigan, part of McLaren Health Care. Dmand AI also links Dr. Barker to 1 hospital and 1 clinical lab.
What is Dr. Thomas Barker's office phone number?
The practice phone on file for Dr. Barker is (517) 975-5600.
What is Dr. Thomas Barker's medical license number?
Dr. Barker holds Michigan license 4301517962.
Which hospitals is Dr. Thomas Barker affiliated with?
Dr. Barker practices at McLaren Greater Lansing in Lansing, Michigan. Dmand AI links Dr. Barker to 1 more hospital.
Has Dr. Thomas Barker received payments from drug or device companies?
CMS Open Payments shows $489 in general payments to Dr. Barker from 4 companies from 2025 to 2025. The largest total came from Verona Pharma, Inc.
How long has Dr. Thomas Barker been practicing?
Dr. Barker's NPI was assigned in 2023.
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