Physician Profile
Barnett J. W. Grier, M.D.
Unclaimed ProfileAbout Dr. Grier
Based in Los Angeles, CA, Barnett J. W. Grier, M.D. is listed in the NPI registry under internal medicine. Barnett graduated from University of California, Geffen School of Medicine in 1968. Barnett is also listed as specializing in family medicine. Medicare claims data shows Barnett provided 860 services to 656 patients. The services billed most often include residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes, test for exercise-induced lung stress, and residence visit for new patient with moderate level of medical decision making, per day, if using time, at least 60 minutes.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (323) 828-7929
- Email not available
Practice Locations
231 W VERNON AVE STE 201
Los Angeles, CA 90037
480 1st Ave
Portola, CA 96122
14718 Hawthorne Blvd
Lawndale, CA 90260
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
Preventive and evaluation
Screening and diagnostic testing
Bones & Joints
Brain and nerves
Cancer screening
Digestive
Exams & Consultations
Heart & Circulation
Heart health
Imaging referral
Immunizations
Lab tests
Lungs & Breathing
Metabolic & Weight
Minor procedures
Office procedures
Office Procedures
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
860 services · 656 patients · 4 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Test for exercise-induced lung stress | Treatment | 94618 |
152 | More than most peers in Internal Medicine |
| Residence visit for established patient with high level of medical decision making, per day, if using time, at least 60 minutes | Office visit | 99350 |
468 | More than most peers in Internal Medicine |
| Residence visit for new patient with moderate level of medical decision making, per day, if using time, at least 60 minutes | Office visit | 99344 |
130 | More than most peers in Internal Medicine |
| Residence visit for established patient with straightforward medical decision making, per day, if using time, at least 15 minutes | Office visit | 99347 |
110 | More often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 27 related providers in 4 groups
Other internists in Los Angeles 8
Same specialty, same city.
Trained at University of California, Geffen School of Medicine 7
Other providers in the same specialty who trained at the same institution.
Class of 1968 at University of California, Geffen School of Medicine 4
Providers who graduated from the same medical school in the same year.
Also performs Test for exercise-induced lung stress 8
Providers in CA who bill this service to Medicare most often.
Common questions
What does Barnett J. W. Grier specialize in?
Barnett J. W. Grier is an internist in Los Angeles, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where is Barnett J. W. Grier located?
Barnett J. W. Grier is listed at 231 W Vernon Ave Ste 201, Los Angeles, CA 90037. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Barnett J. W. Grier's phone number?
The number on file is (323) 828-7929. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Barnett J. W. Grier?
Barnett J. W. Grier's National Provider Identifier is 1932233665. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Barnett J. W. Grier train?
Barnett J. W. Grier attended University of California, Geffen School of Medicine, graduating in 1968. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Barnett J. W. Grier have?
Barnett J. W. Grier has 58 years experience. Calculated from a graduation year of 1968, reported in the CMS National Downloadable File.
CMS public data
What does Barnett J. W. Grier do most often?
According to Medicare billing data, Barnett J. W. Grier provides treatments such as test for exercise-induced lung stress, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Barnett J. W. Grier's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Barnett J. W. Grier. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.