Mark Hall
Rheumatology Physician · Westlake Village, CA
Mark Hall is a rheumatology physician with a practice address in Westlake Village, California, and NPI 1891181103, issued on Apr 13, 2015. Check the license (California A167921, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Hall
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A167921 CA
Self-reported in NPPES; status is on the state search - Practice location
- 141 Triunfo Canyon RD Ste 110, Westlake Village, CA 91361
- Phone
- (805) 371-1393
- Enumerated
- Apr 13, 2015
- Record last updated
- Nov 16, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200826001867); accepts Medicare assignment
- Medical or professional school
- Texas Tech University Health Science Center School Of Medicine, 2015
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 141 Triunfo Canyon RD Ste 110
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Natalie Abrahamian, M.D.Internal Medicine Physician1356882567
- Christine Dahlin, M.D.Internal Medicine Physician1922293786
- Leslie JohnsonFamily Medicine Physician1083107197
- Alina Katsman, M.D.Adult Medicine Physician1528351459
- Fang-Yu Liu, MDInfectious Disease Physician1104311216
- Dharushana Muthulingam, MDInfectious Disease Physician1447526231
Verify Mark Hall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A167921Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average rheumatology physician in 2024
508 Medicare Part D claims for 107 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 27% of claims.
Most prescribed
- Allopurinol77 claims
- Prednisone77 claims
- Methotrexate45 claims
- Hydroxychloroquine Sulfate40 claims
- Sulfasalazine Dr35 claims
- Enbrel Sureclick25 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): 86.1 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
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Hall among 926 rheumatology physician records in California
Mark Hall is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 82% of them.
- NPI issued2015 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2015 · median 2003 among the 641 with a school on file
- Record last updated2020 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Westlake Village → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Olga Popel, MDWestlake Village, CA 913611265518054
- Aelita Khachatrian, MDThousand Oaks, CA 913601306137476
- Elvira Lindwall, M.D.Thousand Oaks, CA 913601881890713
- Rachel Mory, MDThousand Oaks, CA 913601760550586
- Phillip Aleksiejuk, MDWoodland Hills, CA 913641063844579
- Nazanin Firooz, M.D.Woodland Hills, CA 913641447437967
- Albert Katz, M.D.Tarzana, CA 913561699737932
- Adam Kreitenberg, M.D.Tarzana, CA 913561770857682
Common questions
What is Mark Hall's NPI number?
Mark Hall's National Provider Identifier (NPI) is 1891181103, issued on Apr 13, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Mark Hall located?
The NPPES record lists a practice address at 141 Triunfo Canyon RD Ste 110, Westlake Village, CA, 91361. Phone: (805) 371-1393. Providers update this record themselves, so call before visiting.
How can I verify Mark Hall's license?
NPPES lists California license number A167921, 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 Mark Hall prescribe under Medicare Part D?
In 2024, Mark Hall had 508 Medicare Part D claims for 107 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
What is Mark Hall's MIPS final score?
The 2023 MIPS final score is 86.1 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.