Quick answers
- Does Alireza Hosseini accept Medicare assignment?
- Yes. Medicare's clinician data says Alireza Hosseini 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 Alireza Hosseini see?
- In 2024, CMS data shows 258 Original Medicare patients and 751 services for Alireza Hosseini. This counts Original Medicare only and measures volume, not quality.
- What is Alireza Hosseini's NPI number?
- 1629324140. 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 Alireza Hosseini, 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 | 258 |
|---|---|
| Services billed to Medicare | 751 |
| Different services or procedures | 12 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)465 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)95 services
- Continuous monitoring of blood sugar level in tissue fluid using sensor under skin with interpretation and report (95251)87 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)35 services
- Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)24 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%
- Diabetes56%
- Arthritis52%
- Osteoporosis41%
- Ischemic heart disease27%
Hospitals where Alireza Hosseini works
Medicare's Facility Affiliation Data lists Alireza Hosseini 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.
- Adventist Health ClearlakeClearlake, CA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 051317
- Adventist Health Mendocino CoastFort Bragg, CA · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 051325
- Adventist Health Ukiah ValleyUkiah, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050301
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224
- Northern Inyo HospitalBishop, CA · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 051324
Practice locations
Addresses where Alireza Hosseini is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 17; the Medicare profile lists all.
- 105 W E StTehachapi, CA 93561 (661) 823‑7070
- 113 Waterworks Way, Suite 110Irvine, CA 92618 (949) 407‑4404
- 115 Hospital DrUkiah, CA 95482 (707) 463‑2400
- 1165 S Dora St, Suite D1Ukiah, CA 95482 (707) 462‑3111
- 150 Pioneer LnBishop, CA 93514 (760) 873‑5811
Group practices
Medicare enrollment lists Alireza Hosseini as a member of these groups (CMS data updated October 2, 2026).
- Ukiah Adventist Hospital135 clinicians in the group
- Northern Inyo Healthcare District108 clinicians in the group
- Adventist Health Medical Center Tehachapi44 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Ukiah Adventist Hospital
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 (26 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) | 1629324140 |
| 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