Arnold Baas, MD
Internal Medicine Physician · Los Angeles, CA
Arnold Baas, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1720013717, issued on Jul 11, 2006. Check the license (California C51919, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arnold Baas
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- C51919 CA
Self-reported in NPPES; status is on the state search - Practice location
- 100 Ucla Medical Plz Ste 630, Los Angeles, CA 90024
- Phone
- (310) 825-9011
- Enumerated
- Jul 11, 2006
- Entity
- Type 1 · individual
Also registered at 100 Ucla Medical Plz Ste 630
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Olcay Aksoy, M.D.Cardiovascular Disease Physician1881748630
- Sabina Aleksandrovskaya, AGACNPAcute Care Nurse Practitioner1952072845
- Stefanie Brennan, NPAdult Health Nurse Practitioner1396117800
- Nicholas Brownell, M.D.Cardiovascular Disease Physician1285020487
- Kaily Byfield, NPRegistered Nurse1801306097
Verify Arnold Baas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C51919Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
2.0 times the Medicare Part D claims of the average internal medicine physician in 2024
5,621 Medicare Part D claims for 550 beneficiaries, against an average of 2,785 among the 127,794 providers of this specialty who prescribed in Part D.
Most prescribed
- Rosuvastatin Calcium444 claims
- Metoprolol Succinate269 claims
- Amlodipine Besylate263 claims
- Eliquis261 claims
- Atorvastatin Calcium253 claims
- Tacrolimus247 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The Medicare quality score for 2023: 87.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
One hospital or facility affiliation
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
1,665 internal medicine physician records list a Los Angeles practice address
They are 1,665 of the 69,537 NPPES records with a Los Angeles practice address, and 20,403 internal medicine physician records in California.
All 1,665 in Los Angeles → All 20,403 in California → Every provider in Los Angeles →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
Common questions
What is Arnold Baas, MD's NPI number?
Arnold Baas, MD's National Provider Identifier (NPI) is 1720013717, issued on Jul 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Arnold Baas, MD located?
The NPPES record lists a practice address at 100 Ucla Medical Plz Ste 630, Los Angeles, CA, 90024. Phone: (310) 825-9011. Providers update this record themselves, so call before visiting.
How can I verify Arnold Baas, MD's license?
NPPES lists California license number C51919, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Arnold Baas, MD prescribe under Medicare Part D?
In 2024, Arnold Baas, MD had 5,621 Medicare Part D claims for 550 beneficiaries; the average among internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
What is Arnold Baas, MD's Medicare quality score?
The 2023 MIPS final score is 87.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.