Colin Mackay, MD
Internal Medicine Physician · Evansville, IN
Colin Mackay, MD is an internal medicine physician with a practice address in Evansville, Indiana, and NPI 1912683087, issued on Jun 23, 2023. Check the license (Indiana 11023241A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Colin Mackay
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 11023241A IN
Self-reported in NPPES; status is on the state search - Practice location
- 3700 Washington Ave, Evansville, IN 47714
- Phone
- (812) 485-4000
- Enumerated
- Jun 23, 2023
- Record last updated
- Jun 26, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,109 in Indiana → Look up another NPI →
Also registered at 3700 Washington Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Colin Mackay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 11023241ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average internal medicine physician in 2024
661 Medicare Part D claims for 104 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 12 claims were for opioids.
Most prescribed
- Gabapentin29 claims
- Atorvastatin Calcium25 claims
- Memantine Hcl21 claims
- Carvedilol20 claims
- Furosemide17 claims
- Duloxetine Hcl16 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Colin Mackay among 2,109 internal medicine physician records in Indiana
Colin Mackay, MD is one of 2,109 internal medicine physician records with a practice address in Indiana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 96% of them.
- NPI issued2023 · 96% of these records are older, 1% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2025 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
97 internal medicine physician records list a practice address in Evansville
They are 97 of the 4,352 NPPES records with a practice address in Evansville, and 2,109 internal medicine physician records in Indiana.
All 2,109 in Indiana → Every provider in Evansville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Michael Allen, MDEvansville, IN 477141366429714
- Robert Cutrell, MDEvansville, IN 477141396789632
- Donald Elshoff, MDEvansville, IN 477141205813698
- Nigel Islam, MDEvansville, IN 477141942240890
- Stephen Koewler, MDEvansville, IN 477141467439844
- Bryan Laura, MDEvansville, IN 477141346227725
- James Maserejian, MDEvansville, IN 477141326080037
- Divya Patel, MDEvansville, IN 477141184678419
Common questions
What is Colin Mackay, MD's NPI number?
Colin Mackay, MD's National Provider Identifier (NPI) is 1912683087, issued on Jun 23, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Colin Mackay, MD located?
The NPPES record lists a practice address at 3700 Washington Ave, Evansville, IN, 47714. Phone: (812) 485-4000. Providers update this record themselves, so call before visiting.
How can I verify Colin Mackay, MD's license?
NPPES lists Indiana license number 11023241A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Colin Mackay, MD prescribe under Medicare Part D?
In 2024, Colin Mackay, MD had 661 Medicare Part D claims for 104 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.