Mark Fedder, MD
NPI 1922009943 · Gastroenterology Physician · Maryville, IL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Fedder, MD is a Gastroenterology Physician provider in Maryville, IL (NPI 1922009943).
Provider details
- NPI number
- 1922009943
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-067702 (IL)
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
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
107 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) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 36 | $253 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 23 | $109 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 20 | $179 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High RiskG0121 | 16 | $184 |
| Diagnostic Exam of Large Bowel Using a Flexible Endoscope45378 | 12 | $177 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 255 | 250 |
| Omeprazole | 128 | 40 |
| Pantoprazole Sodium | 83 | 27 |
| Esomeprazole Magnesium | 22 | — |
| Famotidine | 22 | — |
| Linaclotidebrand: Linzess | 11 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$60 across 3 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
Additional practice locations (1)
- 6812 State Route 162 Ste 204Maryville, IL 62062-8562Phone: (618) 391-5070Fax: (618) 288-1872
Registry dates
- Enumerated
- 2005-08-02
- Last updated
- 2020-12-29
- Certified
- 2020-12-29
Frequently asked questions
- What is Mark Fedder's NPI number?
- Mark Fedder's National Provider Identifier (NPI) is 1922009943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Fedder's specialty?
- Mark Fedder is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Fedder located?
- Mark Fedder's practice location on file with NPPES is 6810 State Route 162, Maryville, IL 62062-8501.
- What is Mark Fedder's phone number?
- The practice phone number listed in the NPPES registry for Mark Fedder is (618) 288-0346.
- Does Mark Fedder accept Medicare?
- Mark Fedder is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Fedder's NPI active?
- Yes — Mark Fedder's NPI (1922009943) is active in the NPPES registry as of the last update on 2020-12-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.