Joseph M. Nussbaum, MD
Infectious Disease Physician · Westlake Village, CA
Joseph M. Nussbaum, MD is an infectious disease physician with a practice address in Westlake Village, California, and NPI 1922033463, issued on Jul 12, 2006. Check the license (California F46586, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph M. Nussbaum
- Credential
- MD
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- F46586 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2325 Townsgate RD, Westlake Village, CA 91361
- Phone
- (213) 483-0901
- Enumerated
- Jul 12, 2006
- Record last updated
- Dec 4, 2025
- Fax
- (213) 483-6650
- Medicare enrollment
- Enrolled (PECOS I20050719001163); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Verify Joseph M. Nussbaum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license F46586Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.3 times the Medicare Part D claims of the average infectious disease physician in 2024
1,561 Medicare Part D claims for 114 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
Most prescribed
- Biktarvy210 claims
- Atorvastatin Calcium109 claims
- Descovy102 claims
- Odefsey74 claims
- Tivicay74 claims
- Benazepril Hcl69 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 practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Southern California Infectious Disease Medical GroupWestlake Village, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph M. Nussbaum among 1,119 infectious disease physician records in California
Joseph M. Nussbaum, MD is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 54% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1981 · median 2003 among the 735 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Westlake Village → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Fang-Yu Liu, MDWestlake Village, CA 913611104311216
- Philip McDonald, M.D.Thousand Oaks, CA 913611952644122
- Dharushana Muthulingam, MDWestlake Village, CA 913611447526231
- Ramesh Nathan, MDThousand Oaks, CA 913611215025291
- Sujay Dutta, MDThousand Oaks, CA 913601184712168
- Andrew Ma, MDThousand Oaks, CA 913601528299708
- Mark Mazur, MDThousand Oaks, CA 913601245328228
- E Duane Carmalt, M.D.Tarzana, CA 913561952597627
Common questions
What is Joseph M. Nussbaum, MD's NPI number?
Joseph M. Nussbaum, MD's National Provider Identifier (NPI) is 1922033463, issued on Jul 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph M. Nussbaum, MD located?
The NPPES record lists a practice address at 2325 Townsgate RD, Westlake Village, CA, 91361. Phone: (213) 483-0901. Providers update this record themselves, so call before visiting.
How can I verify Joseph M. Nussbaum, MD's license?
NPPES lists California license number F46586, 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 Joseph M. Nussbaum, MD prescribe under Medicare Part D?
In 2024, Joseph M. Nussbaum, MD had 1,561 Medicare Part D claims for 114 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is Joseph M. Nussbaum, MD's MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.