Mark Ovsiowitz, MD
NPI 1881712370 · Gastroenterology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Ovsiowitz, MD is a Gastroenterology Physician provider in Los Angeles, CA (NPI 1881712370).
Provider details
- NPI number
- 1881712370
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A94620 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,191 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| 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 | 349 | $17 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 197 | $179 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 195 | $137 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 107 | $173 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 93 | $122 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 256 | 95 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 127 | 126 |
| Omeprazole | 126 | 47 |
| Famotidine | 75 | 29 |
| Linaclotidebrand: Linzess | 73 | 18 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 58 | 11 |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$102 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-26
- Last updated
- 2013-02-15
Frequently asked questions
- What is Mark Ovsiowitz's NPI number?
- Mark Ovsiowitz's National Provider Identifier (NPI) is 1881712370, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Ovsiowitz's specialty?
- Mark Ovsiowitz is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Ovsiowitz located?
- Mark Ovsiowitz's practice location on file with NPPES is 200 Med Plz, Los Angeles, CA 90095-0001.
- What is Mark Ovsiowitz's phone number?
- The practice phone number listed in the NPPES registry for Mark Ovsiowitz is (310) 825-9711.
- Does Mark Ovsiowitz accept Medicare?
- Mark Ovsiowitz is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Ovsiowitz's NPI active?
- Yes — Mark Ovsiowitz's NPI (1881712370) is active in the NPPES registry as of the last update on 2013-02-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.