Quick answers
- Does Saif A. Alenizi accept Medicare assignment?
- Yes. Medicare's clinician data says Saif A. Alenizi 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 Saif A. Alenizi see?
- In 2024, CMS data shows 294 Original Medicare patients and 1,154 services for Saif A. Alenizi. This counts Original Medicare only and measures volume, not quality.
- What is Saif A. Alenizi's NPI number?
- 1255680997. 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 Saif A. Alenizi, 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 | 294 |
|---|---|
| Services billed to Medicare | 1,154 |
| Different services or procedures | 21 |
| Participating Medicare provider | Yes |
| Average age of these patients | 70 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)556 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)183 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)161 services
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)75 services
- Dialysis procedure including 1 evaluation (90945)57 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%
- Chronic kidney disease75%
- Ischemic heart disease55%
- Heart failure54%
- Diabetes51%
Hospitals where Saif A. Alenizi works
Medicare's Facility Affiliation Data lists Saif A. Alenizi 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
- Emerson Hospital -W Concord, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220084
- Newton-Wellesley HospitalNewton, MA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 220101
- UMass Memorial Medical Center/University CampusWorcester, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220163
Practice locations
Addresses where Saif A. Alenizi is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 119 Belmont StWorcester, MA 01605 (508) 334‑1000
- 133 Old Rd To 9 Acre CorConcord, MA 01742 (978) 287‑3020
- 2014 Washington StNewton, MA 02462 (617) 243‑6000
- 45 Francis StBoston, MA 02115 (617) 732‑5500
- 55 Lake Ave NWorcester, MA 01655 (508) 334‑1000
Group practices
Medicare enrollment lists Saif A. Alenizi as a member of these groups (CMS data updated October 2, 2026).
- Brigham and Womens Physicians Organization Inc2,994 clinicians in the group
- UMass Memorial Medical Group Inc2,516 clinicians in the group
- Mass General Brigham Medical Group Suburban Massachusetts Inc602 clinicians in the group
- Emerson Practice Associates, Inc240 clinicians in the group
Specialties
- Nephrologyprimary
- Internal Medicinealso
Other nephrologists in Worcester
Clinicians with the same Medicare primary specialty in Worcester, MA — not a recommendation.
Other clinicians in Brigham and Womens Physicians Organization Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2006 (20 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) | 1255680997 |
| 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