Mark Fleisher
NPI 1134125891 · Gastroenterology Physician · Jacksonville, FL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Fleisher is a Gastroenterology Physician provider in Jacksonville, FL (NPI 1134125891).
Provider details
- NPI number
- 1134125891
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
- License
- ME 0076032 (FL)
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
21 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
812 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 234 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 140 | $88 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 126 | $109 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 72 | $184 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 46 | $179 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 793 | 299 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 207 | 187 |
| Dicyclomine Hcl | 199 | 83 |
| Famotidine | 136 | 56 |
| Omeprazole | 127 | 40 |
| Linaclotidebrand: Linzess | 47 | 18 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$878 across 39 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
- 2005-06-27
- Last updated
- 2011-05-23
Frequently asked questions
- What is Mark Fleisher's NPI number?
- Mark Fleisher's National Provider Identifier (NPI) is 1134125891, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Fleisher's specialty?
- Mark Fleisher is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Fleisher located?
- Mark Fleisher's practice location on file with NPPES is 836 Prudential Dr, Jacksonville, FL 32207-8334.
- What is Mark Fleisher's phone number?
- The practice phone number listed in the NPPES registry for Mark Fleisher is (904) 288-0433.
- Does Mark Fleisher accept Medicare?
- Mark Fleisher is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Fleisher's NPI active?
- Yes — Mark Fleisher's NPI (1134125891) is active in the NPPES registry as of the last update on 2011-05-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.