Mark Hall
NPI 1891181103 · Rheumatology Physician · Westlake Village, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Hall is a Rheumatology Physician provider in Westlake Village, CA (NPI 1891181103).
Provider details
- NPI number
- 1891181103
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
1,071 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 422 | $136 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 405 | $17 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 98 | $96 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 74 | $191 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 25 | $177 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Allopurinol | 77 | 21 |
| Prednisone | 77 | 32 |
| Methotrexate Sodiumbrand: Methotrexate | 45 | — |
| Hydroxychloroquine Sulfate | 40 | 13 |
| Sulfasalazinebrand: Sulfasalazine Dr | 35 | — |
| Etanerceptbrand: Enbrel Sureclick | 25 | — |
| Apremilastbrand: Otezla |
Practice location
Mailing address
Additional practice locations (1)
- 7703 Floyd Curl DrAttn: Ms. Megan Hudak; Office of Education, Mc 7871San Antonio, TX 78229-3901Phone: (210) 567-4724
Registry dates
- Enumerated
- 2015-04-13
- Last updated
- 2020-11-16
- Certified
- 2020-11-16
Frequently asked questions
- What is Mark Hall's NPI number?
- Mark Hall's National Provider Identifier (NPI) is 1891181103, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Hall's specialty?
- Mark Hall is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Hall located?
- Mark Hall's practice location on file with NPPES is 141 Triunfo Canyon Rd Ste 110, Westlake Village, CA 91361-2525.
- What is Mark Hall's phone number?
- The practice phone number listed in the NPPES registry for Mark Hall is (805) 371-1393.
- Does Mark Hall accept Medicare?
- Mark Hall is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Hall's NPI active?
- Yes — Mark Hall's NPI (1891181103) is active in the NPPES registry as of the last update on 2020-11-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.