Mark Nelson, MD
NPI 1891737763 · Gastroenterology Physician · La Porte, IN
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Nelson, MD is a Gastroenterology Physician provider in La Porte, IN (NPI 1891737763).
Provider details
- NPI number
- 1891737763
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 01040264A (IN)
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
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
1,183 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) |
|---|---|---|
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 200 | $5 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 181 | $228 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 171 | $84 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 127 | $81 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 123 | $73 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 23 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 243 | 75 |
| Omeprazole | 182 | 55 |
| Famotidine | 90 | 32 |
| Linaclotidebrand: Linzess | 72 | 13 |
| Nortriptyline Hcl | 61 | 13 |
| Mesalamine | 57 | 13 |
| Dicyclomine Hcl | 45 | 14 |
| Lansoprazole |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$182 across 5 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
- 2006-06-12
- Last updated
- 2023-10-13
- Certified
- 2023-10-13
Frequently asked questions
- What is Mark Nelson's NPI number?
- Mark Nelson's National Provider Identifier (NPI) is 1891737763, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Nelson's specialty?
- Mark Nelson is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Nelson located?
- Mark Nelson's practice location on file with NPPES is 900 I St Fl 2, La Porte, IN 46350-5533.
- What is Mark Nelson's phone number?
- The practice phone number listed in the NPPES registry for Mark Nelson is (219) 872-6566.
- Does Mark Nelson accept Medicare?
- Mark Nelson is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Nelson's NPI active?
- Yes — Mark Nelson's NPI (1891737763) is active in the NPPES registry as of the last update on 2023-10-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.