Michael A. Kilgannon, M.D.
Internal Medicine Physician · Willimantic, CT
Michael A. Kilgannon, M.D. is an internal medicine physician with a practice address in Willimantic, Connecticut, and NPI 1164483947, issued on Mar 31, 2006. Check the license (Connecticut 025777, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Michael A. Kilgannon
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 025777 CT
Self-reported in NPPES; status is on the state search - Practice location
- 1703 Main St, Willimantic, CT 06226
- Phone
- (860) 456-1252
- Enumerated
- Mar 31, 2006
- Record last updated
- Sep 4, 2019 (not updated in 7 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,623 in Connecticut → Look up another NPI →
Also registered at 1703 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Edward Sawicki, MDInternal Medicine Physician1013916097
- Craig Sweeney, MDEmergency Medicine Physician1033201470
Verify Michael A. Kilgannon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 025777Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
18% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,609 Medicare Part D claims for 78 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Atorvastatin Calcium232 claims
- Eliquis129 claims
- Escitalopram Oxalate96 claims
- Omeprazole96 claims
- Levothyroxine Sodium88 claims
- Amlodipine Besylate81 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.5 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Michael A. Kilgannon among 2,623 internal medicine physician records in Connecticut
Michael A. Kilgannon, M.D. is one of 2,623 internal medicine physician records with a practice address in Connecticut. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 52% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2019 · 61% 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 Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
20 internal medicine physician records list a practice address in Willimantic
They are 20 of the 487 NPPES records with a practice address in Willimantic, and 2,623 internal medicine physician records in Connecticut.
All 2,623 in Connecticut → Every provider in Willimantic → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Mary Barry, M.D.Willimantic, CT 062261285695841
- John Carey, MDWillimantic, CT 062261225086358
- Peter Jones, MDWillimantic, CT 062261619934296
- Walter McPhee, MDWillimantic, CT 062261144229113
- Julian Munoz, MDWillimantic, CT 062261184920274
- Edward Nemergut, MDWillimantic, CT 062261508810201
- Chelliah Pandian, MDWillimantic, CT 062261467419010
- Marjorie Petro, M.D.Willimantic, CT 062261760676100
Common questions
What is Michael A. Kilgannon, M.D.'s NPI number?
Michael A. Kilgannon, M.D.'s National Provider Identifier (NPI) is 1164483947, issued on Mar 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael A. Kilgannon, M.D. located?
The NPPES record lists a practice address at 1703 Main St, Willimantic, CT, 06226. Phone: (860) 456-1252. Providers update this record themselves, so call before visiting.
How can I verify Michael A. Kilgannon, M.D.'s license?
NPPES lists Connecticut license number 025777, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael A. Kilgannon, M.D. prescribe under Medicare Part D?
In 2024, Michael A. Kilgannon, M.D. had 2,609 Medicare Part D claims for 78 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Michael A. Kilgannon, M.D.'s MIPS final score?
The 2023 MIPS final score is 84.5 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.