Quick answers
- Does Idriss El Koussaimi accept Medicare assignment?
- Yes. Medicare's clinician data says Idriss El Koussaimi 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 Idriss El Koussaimi see?
- In 2024, CMS data shows 363 Original Medicare patients and 2,895 services for Idriss El Koussaimi. This counts Original Medicare only and measures volume, not quality.
- What is Idriss El Koussaimi's NPI number?
- 1164695029. 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 Idriss El Koussaimi, 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 | 363 |
|---|---|
| Services billed to Medicare | 2,895 |
| Different services or procedures | 44 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)625 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)488 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)386 services
- Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)223 services
- Annual depression screening, 5 to 15 minutes (G0444)181 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 pressure75%
- High cholesterol75%
- Arthritis34%
- Ischemic heart disease27%
- Chronic kidney disease26%
- Diabetes25%
Hospitals where Idriss El Koussaimi works
Medicare's Facility Affiliation Data lists Idriss El Koussaimi 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.
- Brigham and Women Faulkner HospitalJamaica Plain, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220119
- Brigham and Women's HospitalBoston, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220110
- Metrowest Medical CenterFramingham, MA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 220175
- Milford Regional Medical CenterMilford, MA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 220090
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220101
Practice locations
Addresses where Idriss El Koussaimi is enrolled with Medicare (CMS data updated October 2, 2026).
- 479 Washington StHolliston, MA 01746 (508) 429‑2377
Group practices
Medicare enrollment lists Idriss El Koussaimi as a member of this group (CMS data updated October 2, 2026).
- Charles River Medical Associates, PC119 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Massachusetts
Clinicians with the same Medicare primary specialty in Massachusetts — not a recommendation.
Other clinicians in Charles River Medical Associates, PC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2002 (24 years since medical school) |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1164695029 |
| 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