Quick answers
- Does Gregory S. Tennant accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory S. Tennant 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 Gregory S. Tennant see?
- In 2024, CMS data shows 171 Original Medicare patients and 1,269 services for Gregory S. Tennant. This counts Original Medicare only and measures volume, not quality.
- What is Gregory S. Tennant's NPI number?
- 1073581385. 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 Gregory S. Tennant, 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 | 171 |
|---|---|
| Services billed to Medicare | 1,269 |
| Different services or procedures | 107 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)445 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)81 services
- Aspiration and/or injection of fluid large joint using ultrasound guidance (20611)80 services
- Injection, ketorolac tromethamine, per 15 mg (J1885)72 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)55 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%
- Arthritis74%
- Diabetes52%
- Heart failure35%
- Ischemic heart disease33%
Hospitals where Gregory S. Tennant works
Medicare's Facility Affiliation Data lists Gregory S. Tennant 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.
- Antelope Valley HospitalLancaster, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050056
- Palmdale Regional Medical CenterPalmdale, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050204
Practice locations
Addresses where Gregory S. Tennant is enrolled with Medicare (CMS data updated October 2, 2026).
- 23838 Valencia Blvd, Suite 260Valencia, CA 91355 (661) 726‑5005
- 42135 10th St W, Suite 101Lancaster, CA 93534 (661) 726‑5005
Group practices
Medicare enrollment lists Gregory S. Tennant as a member of this group (CMS data updated October 2, 2026).
- Avors Medical Group18 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Valencia
Clinicians with the same Medicare primary specialty in Valencia, CA — not a recommendation.
Other clinicians in Avors Medical Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 1999 (27 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073581385 |
| 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