Mark Flasar, M.D.
NPI 1326079278 · Gastroenterology Physician · Annapolis, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Flasar, M.D. is a Gastroenterology Physician provider in Annapolis, MD (NPI 1326079278).
Provider details
- NPI number
- 1326079278
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D60388 (MD)
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
1,418 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 362 | $94 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 202 | $147 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 150 | $258 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 127 | $133 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 116 | $99 |
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 | 275 | 89 |
| Mesalamine | 88 | 21 |
| Omeprazole | 76 | 25 |
| Famotidine | 67 | 28 |
| Adalimumabbrand: Humira(cf) Pen | 53 | — |
| Ustekinumabbrand: Stelara | 42 | — |
| Rabeprazole Sodium | 27 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$38,458 across 134 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
- 2006-07-06
- Last updated
- 2015-10-16
Frequently asked questions
- What is Mark Flasar's NPI number?
- Mark Flasar's National Provider Identifier (NPI) is 1326079278, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Flasar's specialty?
- Mark Flasar is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Flasar located?
- Mark Flasar's practice location on file with NPPES is 820 Bestgate Rd, Annapolis, MD 21401-3404.
- What is Mark Flasar's phone number?
- The practice phone number listed in the NPPES registry for Mark Flasar is (410) 224-2116.
- Does Mark Flasar accept Medicare?
- Mark Flasar is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Flasar's NPI active?
- Yes — Mark Flasar's NPI (1326079278) is active in the NPPES registry as of the last update on 2015-10-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.