Quick answers
- Does Barnett J. Grier Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Barnett J. Grier Jr. 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 Barnett J. Grier Jr. see?
- In 2024, CMS data shows 393 Original Medicare patients and 863 services for Barnett J. Grier Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Barnett J. Grier Jr.'s NPI number?
- 1932233665. 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 Barnett J. Grier Jr., 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 | 393 |
|---|---|
| Services billed to Medicare | 863 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes (99350)468 services
- Test for exercise-induced lung stress (94618)152 services
- Residence visit for new patient with moderate level of medical decision making, per day, if using time, at least 60 minutes (99344)130 services
- Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes (99347)110 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%
- COPD75%
- Arthritis57%
- Diabetes56%
- Heart failure55%
Hospitals where Barnett J. Grier Jr. works
Medicare's Facility Affiliation Data lists Barnett J. Grier Jr. 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.
- Eastern Plumas Hospital - Portola CampusPortola, CA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 051300
Practice locations
Addresses where Barnett J. Grier Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 480 1st AvePortola, CA 96122 (530) 832‑6600
- 5750 Division St, Suite 208Riverside, CA 92506 (951) 368‑0428
Group practices
Medicare enrollment lists Barnett J. Grier Jr. as a member of these groups (CMS data updated October 2, 2026).
- Eastern Plumas Health Care District29 clinicians in the group
- Apogee Health Solutions LPC2 clinicians in the group
Specialties
- Family Practiceprimary
- Internal Medicinealso
Other family doctors in Portola
Clinicians with the same Medicare primary specialty in Portola, CA — not a recommendation.
Other clinicians in Eastern Plumas Health Care District
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1968 (58 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) | 1932233665 |
| 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