Quick answers
- Does Katherine P. Keller accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine P. Keller 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 Katherine P. Keller see?
- In 2024, CMS data shows 102 Original Medicare patients and 32,378 services for Katherine P. Keller. This counts Original Medicare only and measures volume, not quality.
- What is Katherine P. Keller's NPI number?
- 1568854404. 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 Katherine P. Keller, 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 | 102 |
|---|---|
| Services billed to Medicare | 32,378 |
| Different services or procedures | 73 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)192 services
- Blood test, comprehensive group of blood chemicals (80053)158 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)150 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)147 services
- Infusion, normal saline solution, 250 cc (J7050)131 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).
- Arthritis75%
- High cholesterol67%
- High blood pressure65%
- Osteoporosis32%
- Chronic kidney disease29%
- Anxiety26%
Hospitals where Katherine P. Keller works
Medicare's Facility Affiliation Data lists Katherine P. Keller 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.
- Bridgton HospitalBridgton, ME · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 201310
- MaineHealth Maine Medical CenterPortland, ME · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 200009
- Northern Light Mercy HospitalPortland, ME · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 200008
- The Memorial HospitalNorth Conway, NH · Critical Access Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 301307
Practice locations
Addresses where Katherine P. Keller is enrolled with Medicare (CMS data updated October 2, 2026).
- 51 Sewall StPortland, ME 04102 (207) 774‑5761
Group practices
Medicare enrollment lists Katherine P. Keller as a member of this group (CMS data updated October 2, 2026).
- Rheumatology Associates P.A.10 clinicians in the group
Specialties
- Rheumatologyprimary
Other rheumatologists in Portland
Clinicians with the same Medicare primary specialty in Portland, ME — not a recommendation.
Other clinicians in Rheumatology Associates P.A.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2015 (11 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568854404 |
| 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