Quick answers
- Does Aaron B. Kirby accept Medicare assignment?
- Yes. Medicare's clinician data says Aaron B. Kirby accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Aaron B. Kirby see?
- In 2024, CMS data shows 18 Original Medicare patients and 27 services for Aaron B. Kirby. This counts Original Medicare only and measures volume, not quality.
- What is Aaron B. Kirby's NPI number?
- 1770863318. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Aaron B. Kirby, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 18 |
|---|---|
| Services billed to Medicare | 27 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure72%
Hospitals where Aaron B. Kirby works
Medicare's Facility Affiliation Data lists Aaron B. Kirby at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- LincolnhealthDamariscotta, ME · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 201302
Practice locations
Addresses where Aaron B. Kirby is enrolled with Medicare (CMS data updated October 2, 2026).
- 22 Bramhall StPortland, ME 04102
- 35 Mile StDamariscotta, ME 04543 (207) 563‑1234
Group practices
Medicare enrollment lists Aaron B. Kirby as a member of this group (CMS data updated October 2, 2026).
- MaineHealth2,633 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Portland
Clinicians with the same Medicare primary specialty in Portland, ME — not a recommendation.
Other clinicians in MaineHealth
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Mercer University School Of Medicine |
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1770863318 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians