Doctor profile · Federal record
Dr. Mark Ovsiowitz, MD
Gastroenterology Physician (CMS: Gastroenterology) · Los Angeles, CA
- NPI 1881712370
- Accepts Medicare
- MIPS 84.9 / 100 · 2023
- 26 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
200 MED Plz, Suite 365
Los Angeles, CA 900950001
(310) 825-9711 - Mailing address
-
5767 W Century Blvd, Suite 200
Los Angeles, CA 900455632
Credentials & registration
- NPI registered
- March 2007 — 19 yrs on file
- Profile last updated
- February 15, 2013
- Year of graduation
- 2000 — 26 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- California #A94620
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1881712370. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
855
Distinct HCPCS
10
Medicare allowed
$139,287
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99204 |
New patient office or other outpatient visit, 45-59 minutes | 217 | 217 | $181 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 181 | 143 | $139 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 113 | 113 | $175 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 102 | 57 | $127 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 77 | 77 | $186 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 51 | 51 | $110 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 29 | 29 | $197 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 29 | 29 | $193 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 24 | 24 | $261 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 18 | 18 | $105 |
In context: peer comparison
Among 52 peers in Los Angeles Gastroenterology Physician, average services per provider: 124. This provider delivers 6.9× the peer median.Open Payments
Industry payments received
All-time total
$102
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Olympus America INC. | 1 | $79.32 | |
| Cook Medical LLC | 1 | $22.32 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
813
Patients
361
Total drug cost
$120,584
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 257 | 99 | $5,354 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 148 | 145 | $12,040 |
| Omeprazole | Generic | 110 | 46 | $3,242 |
| Famotidine | Generic | 75 | 29 | $1,591 |
| Dexlansoprazole Dr (Dexlansoprazole) | Brand | 69 | 16 | $31,429 |
| Linzess (Linaclotide) | Brand | 61 | 15 | $52,099 |
| Diphenoxylate-Atropine (Diphenoxylate Hcl/Atropine) | Brand | 18 | 0 | $1,363 |
| Dicyclomine Hcl | Generic | 14 | 0 | $724 |
| Sucralfate | Generic | 14 | 0 | $7,343 |
| Oxycodone-Acetaminophen (Oxycodone Hcl/Acetaminophen) | Brand | 13 | 0 | $408 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Ovsiowitz's medical specialty?
Dr. Mark Ovsiowitz practices Gastroenterology Physician in Los Angeles, CA.
Where does Dr. Mark Ovsiowitz practice?
Dr. Mark Ovsiowitz practices at 200 MED Plz, Los Angeles, CA 900950001. Office phone: 3108259711.
What is Dr. Mark Ovsiowitz's NPI?
Dr. Mark Ovsiowitz's National Provider Identifier (NPI) is 1881712370, issued by NPPES.
Does Dr. Mark Ovsiowitz accept Medicare assignment?
Yes. Dr. Mark Ovsiowitz accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Ovsiowitz commonly perform?
Top Medicare-reported procedures in 2023: New patient office or other outpatient visit (HCPCS 99204); Established patient office or other outpatient visit (HCPCS 99214); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.