Quick answers
- Does Timothy G. Keenan accept Medicare assignment?
- Yes. Medicare's clinician data says Timothy G. Keenan 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 Timothy G. Keenan see?
- In 2024, CMS data shows 499 Original Medicare patients and 3,486 services for Timothy G. Keenan. This counts Original Medicare only and measures volume, not quality.
- What is Timothy G. Keenan's NPI number?
- 1508851791. 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 Timothy G. Keenan, 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 | 499 |
|---|---|
| Services billed to Medicare | 3,486 |
| Different services or procedures | 141 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)462 services
- Insertion of needle into vein for collection of blood sample (36415)401 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)265 services
- Blood test, basic group of blood chemicals (calcium, total) (80048)206 services
- Blood test, lipids (cholesterol and triglycerides) (80061)188 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 cholesterol71%
- High blood pressure67%
- Arthritis43%
- Anxiety27%
- Depression24%
- Atrial fibrillation23%
Hospitals where Timothy G. Keenan works
Medicare's Facility Affiliation Data lists Timothy G. Keenan 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.
- Elliot HospitalManchester, NH · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 300012
- Exeter Hospital IncExeter, NH · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 300023
- Portsmouth Regional HospitalPortsmouth, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300029
- Wentworth-Douglass HospitalDover, NH · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 300018
Practice locations
Addresses where Timothy G. Keenan is enrolled with Medicare (CMS data updated October 2, 2026).
- 118 Portsmouth Ave, Suite 101Stratham, NH 03885
Specialties
- Family Practiceprimary
Other family doctors in Stratham
Clinicians with the same Medicare primary specialty in Stratham, NH — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1997 (29 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1508851791 |
| 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