Quick answers
- Does Jason A. Grieshober accept Medicare assignment?
- Yes. Medicare's clinician data says Jason A. Grieshober 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 Jason A. Grieshober see?
- In 2024, CMS data shows 109 Original Medicare patients and 755 services for Jason A. Grieshober. This counts Original Medicare only and measures volume, not quality.
- What is Jason A. Grieshober's NPI number?
- 1063730612. 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 Jason A. Grieshober, 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 | 109 |
|---|---|
| Services billed to Medicare | 755 |
| Different services or procedures | 28 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Injection, triamcinolone acetonide, not otherwise specified, 10 mg (J3301)295 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)164 services
- Aspiration and/or injection of fluid from large joint (20610)96 services
- X-ray of knee, 4 or more views (73564)51 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)34 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).
- Arthritis75%
- High cholesterol68%
- High blood pressure63%
- Diabetes39%
- Depression21%
- Chronic kidney disease21%
Practice locations
Addresses where Jason A. Grieshober is enrolled with Medicare (CMS data updated October 2, 2026).
- 1661 Golden Rain RdSeal Beach, CA 90740 (714) 241‑7000
- 22 Odyssey, Suite 205Irvine, CA 92618 (949) 586‑3200
- 947 S Anaheim Blvd, Suite 125Anaheim, CA 92805 (714) 241‑7000
Group practices
Medicare enrollment lists Jason A. Grieshober as a member of this group (CMS data updated October 2, 2026).
- Orthowest47 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Orthowest
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Temple University School Of Medicine |
| Graduation year | 2010 (16 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1063730612 |
| 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
- 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