Barnett Grier, M.D.
NPI 1932233665 · Internal Medicine Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Barnett Grier, M.D. is a Internal Medicine Physician provider in Los Angeles, CA (NPI 1932233665).
Provider details
- NPI number
- 1932233665
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A23617 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
860 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Residence Visit for Established Patient With High Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99350 | 468 | $185 |
| Test for Exercise-Induced Lung Stress94618 | 152 | $35 |
| Residence Visit for New Patient With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99344 | 130 | $142 |
| Residence Visit for Established Patient With Straightforward Medical Decision Making, Per Day, If Using Time, at Least 15 Minutes99347 | 110 | $45 |
Typical Medicare-allowed amounts for these services range $35–$185 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 116 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 294 | 73 |
| Losartan Potassium | 254 | 77 |
| Amlodipine Besylate | 196 | 51 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 189 | 30 |
| Lisinopril | 186 | 45 |
| Omeprazole | 160 | 41 |
Practice location
Mailing address
Additional practice locations (2)
- 14718 Hawthorne BlvdLawndale, CA 90260-1523Phone: (323) 828-7929Fax: (310) 564-7760
- 480 1st AvePortola, CA 96122-9405Phone: (530) 832-6600Fax: (530) 832-5968
Registry dates
- Enumerated
- 2007-03-15
- Last updated
- 2022-07-10
- Certified
- 2022-07-10
Frequently asked questions
- What is Barnett Grier's NPI number?
- Barnett Grier's National Provider Identifier (NPI) is 1932233665, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Barnett Grier's specialty?
- Barnett Grier is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Barnett Grier located?
- Barnett Grier's practice location on file with NPPES is 231 W Vernon Ave Ste 201, Los Angeles, CA 90037-2779.
- What is Barnett Grier's phone number?
- The practice phone number listed in the NPPES registry for Barnett Grier is (323) 828-7929.
- Does Barnett Grier accept Medicare?
- Barnett Grier is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Barnett Grier's NPI active?
- Yes — Barnett Grier's NPI (1932233665) is active in the NPPES registry as of the last update on 2022-07-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.