Quick answers
- Does Gregory T. Heinen accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory T. Heinen 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 T. Heinen see?
- In 2024, CMS data shows 295 Original Medicare patients and 4,351 services for Gregory T. Heinen. This counts Original Medicare only and measures volume, not quality.
- What is Gregory T. Heinen's NPI number?
- 1962447961. 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 T. Heinen, 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 | 295 |
|---|---|
| Services billed to Medicare | 4,351 |
| Different services or procedures | 78 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Injection, methylprednisolone acetate, 1 mg (J1010)1,682 services
- Hyaluronan or derivative, synvisc or synvisc-one, for intra-articular injection, 1 mg (J7325)1,248 services
- X-ray of knee, 1-2 views (73560)194 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)193 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)184 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%
- Arthritis73%
- Diabetes36%
- Ischemic heart disease28%
- Osteoporosis25%
Hospitals where Gregory T. Heinen works
Medicare's Facility Affiliation Data lists Gregory T. Heinen 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.
- Casa Colina HospitalPomona, CA · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 050782
- Huntington HospitalPasadena, CA · Acute Care Hospital · Emergency services: listed by Medicare · CCN 050438
- Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050231
- USC Arcadia HospitalArcadia, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050238
Practice locations
Addresses where Gregory T. Heinen is enrolled with Medicare (CMS data updated October 2, 2026).
- 289 W Huntington Dr, Suite 304Arcadia, CA 91007 (626) 979‑2002
- 6700 Indiana Ave, Suite 145Riverside, CA 92506 (626) 979‑2002
Group practices
Medicare enrollment lists Gregory T. Heinen as a member of this group (CMS data updated October 2, 2026).
- Cedars-Sinai Medical Care Foundation1,692 clinicians in the group
Specialties
- Sports Medicineprimary
- Orthopedic Surgeryalso
Other sports medicine doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Cedars-Sinai Medical Care Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Yale University School Of Medicine |
| Graduation year | 1994 (32 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962447961 |
| 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