Doctor profile · Federal record
Dr. Mark Flasar, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Annapolis, MD
- NPI 1326079278
- Accepts Medicare
- 26 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
820 Bestgate RD, Suite 2A
Annapolis, MD 214013404
(410) 224-2116
fax (410) 224-2118
Credentials & registration
- NPI registered
- July 2006 — 20 yrs on file
- Profile last updated
- October 16, 2015
- Year of graduation
- 2000 — 26 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Maryland #D60388
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1326079278. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
3,601
Distinct HCPCS
10
Medicare allowed
$254,024
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J1745 |
Injection, infliximab, excludes biosimilar, 10 mg | 2,300 | 14 | $33 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 330 | 244 | $91 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 191 | 190 | $160 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 146 | 146 | $101 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 113 | 112 | $261 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 100 | 100 | $117 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 93 | 91 | $126 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 56 | 56 | $185 | |
96413 |
Administration of chemotherapy into vein, 1 hour or less | 47 | 17 | $139 | |
96415 |
Administration of chemotherapy into vein, each additional hour | 44 | 14 | $30 |
In context: peer comparison
Among 8 peers in this city , average services per provider: 113. This provider delivers 32× the peer median.Open Payments
Industry payments received
All-time total
$38,458
Transactions
130
Manufacturers
15
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| ABBVIE INC. | 72 | $32,883.57 | |
| Janssen Biotech, Inc. | 13 | $4,406.62 | |
| Madrigal Pharmaceuticals | 4 | $187.66 | |
| Takeda Pharmaceuticals U.S.A., Inc. | 8 | $153.44 | |
| QOL Medical, LLC | 6 | $148.95 | |
| PFIZER INC. | 7 | $139.71 | |
| Intercept Pharmaceuticals, Inc. | 5 | $102.34 | |
| Medtronic, Inc. | 1 | $90.93 | |
| Celgene Corporation | 4 | $82.85 | |
| Ipsen Biopharmaceuticals, Inc | 4 | $81.11 | |
| Salix Pharmaceuticals, a division of Bausch Health US, LLC | 2 | $28.13 | |
| Melinta Therapeutics, LLC | 1 | $22.88 | |
| GENZYME CORPORATION | 1 | $21.31 | |
| Fresenius Kabi USA, LLC | 1 | $20.99 | |
| Gilead Sciences, Inc. | 1 | $20.77 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
665
Patients
131
Total drug cost
$1,912,165
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 235 | 72 | $4,381 |
| Mesalamine | Generic | 89 | 19 | $85,712 |
| Famotidine | Generic | 66 | 25 | $1,537 |
| Omeprazole | Generic | 51 | 15 | $1,243 |
| Humira(Cf) Pen (Adalimumab) | Brand | 37 | 0 | $456,886 |
| Stelara (Ustekinumab) | Brand | 36 | 0 | $1,166,496 |
| Budesonide Ec (Budesonide) | Brand | 23 | 0 | $8,319 |
| Dicyclomine Hcl | Generic | 22 | 0 | $614 |
| Budesonide Dr (Budesonide) | Brand | 20 | 0 | $3,973 |
| Diphenoxylate-Atropine (Diphenoxylate Hcl/Atropine) | Brand | 20 | 0 | $930 |
Frequently asked questions
What is Dr. Mark Flasar's medical specialty?
Dr. Mark Flasar practices Gastroenterology Physician in Annapolis, MD.
Where does Dr. Mark Flasar practice?
Dr. Mark Flasar practices at 820 Bestgate RD, Annapolis, MD 214013404. Office phone: 4102242116.
What is Dr. Mark Flasar's NPI?
Dr. Mark Flasar's National Provider Identifier (NPI) is 1326079278, issued by NPPES.
Does Dr. Mark Flasar accept Medicare assignment?
Yes. Dr. Mark Flasar accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Flasar commonly perform?
Top Medicare-reported procedures in 2023: Injection, infliximab, excludes biosimilar, 10 mg (HCPCS J1745); Established patient office or other outpatient visit (HCPCS 99213); Biopsy of large bowel using a flexible endoscope (HCPCS 45380). Source: CMS Medicare Physician & Other Practitioners file.