DR. BARNETT J. W. JR. GRIER (M.D.) – Internal Medicine Physician, NPI 1932233665
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
21,511 INTERNAL MEDICINE in CA
Provider Addresses for DR. BARNETT J. W. JR. GRIER (M.D.)
480 1st Ave
Portola, CA 961229405
Phone: (530) 832-6600
Fax: (530) 832-5968
Type: Location
14718 Hawthorne Blvd
Lawndale, CA 902601523
Phone: (323) 828-7929
Fax: (310) 564-7760
Type: Location
14718 HAWTHORNE BLVD
LAWNDALE, CA 902601523
Phone: (323) 828-7929
Fax: (310) 564-7760
Type: Location
1214 IDAHO AVE
#5
SANTA MONICA, CA 904033054
Phone: (323) 828-7929
Fax: (310) 564-7760
Type: Mailing
231 W VERNON AVE STE 201
LOS ANGELES, CA 900372779
Phone: (323) 828-7929
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2006-02-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20060223000847 | I | Internal Medicine | CA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99350 | Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes | 367 | 209 | $0 |
| 94618 | Test for exercise-induced lung stress | 174 | 152 | $0 |
| 99344 | Residence visit for new patient with moderate level of medical decision making, per day, if using time, at least 60 minutes | 65 | 65 | $0 |
| 99347 | Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes | 28 | 23 | $0 |
Insurance plans in this area (ZIP 96122)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Family Practice | CA | |
| Nurse Practitioner | CA | |
| Endocrinology, Internal Medicine, Endocrinology | CA | |
| Orthopedic Surgery | CA | |
| Family Practice | CA | |
| Family Practice, Emergency Medicine | CA | |
| Diagnostic Radiology | WI | |
| Emergency Medicine | CA | |
| Emergency Medicine, Internal Medicine | CA | |
| Registered Dietitian Or Nutrition Professional | IL |
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