Quick answers
- Does Garbis D. Keusseyan accept Medicare assignment?
- Yes. Medicare's clinician data says Garbis D. Keusseyan 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 Garbis D. Keusseyan see?
- In 2024, CMS data shows 218 Original Medicare patients and 413 services for Garbis D. Keusseyan. This counts Original Medicare only and measures volume, not quality.
- What is Garbis D. Keusseyan's NPI number?
- 1285389973. 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 Garbis D. Keusseyan, 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 | 218 |
|---|---|
| Services billed to Medicare | 413 |
| Different services or procedures | 14 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)134 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)124 services
- Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)45 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)39 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)37 services
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 blood pressure68%
- High cholesterol59%
- Arthritis37%
- Diabetes34%
- Ischemic heart disease29%
- COPD28%
Hospitals where Garbis D. Keusseyan works
Medicare's Facility Affiliation Data lists Garbis D. Keusseyan 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.
- Millinocket Regional HospitalMillinocket, ME · Critical Access Hospital · Emergency services: listed by Medicare · CCN 201307
- Northern Light Eastern Maine Medical CenterBangor, ME · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 200033
- Penobscot Valley HospitalLincoln, ME · Critical Access Hospital · Emergency services: listed by Medicare · CCN 201303
Practice locations
Addresses where Garbis D. Keusseyan is enrolled with Medicare (CMS data updated October 2, 2026).
- 30 Houlton StPatten, ME 04765 (207) 528‑2285
- 50 Summer StMillinocket, ME 04462 (207) 528‑2285
- 59 Bangor StHoulton, ME 04730 (207) 528‑2285
Group practices
Medicare enrollment lists Garbis D. Keusseyan as a member of this group (CMS data updated October 2, 2026).
- Katahdin Valley Health Center67 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Maine
Clinicians with the same Medicare primary specialty in Maine — not a recommendation.
Other clinicians in Katahdin Valley Health Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2022 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285389973 |
| 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