Doctor profile · Federal record
Dr. Mark Nelson, MD
Gastroenterology Physician (CMS: Gastroenterology) · La Porte, IN
- NPI 1891737763
- Accepts Medicare
- 39 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
900 I St Fl 2
La Porte, IN 463505533
(219) 872-6566
fax (219) 872-2712 - Mailing address
-
Po Box 781076
Detroit, MI 482781076
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- October 13, 2023
- Year of graduation
- 1987 — 39 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Indiana #01040264A
- Medicaid
- IN #100209820A
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1891737763. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
1,465
Distinct HCPCS
10
Medicare allowed
$148,538
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
G0500 |
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 monito | 280 | 272 | $5 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 214 | 177 | $85 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 193 | 190 | $233 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 143 | 73 | $75 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 140 | 137 | $86 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 118 | 58 | $114 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 97 | 92 | $123 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 62 | 62 | $170 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 54 | 52 | $113 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 44 | 43 | $165 |
In context: peer comparison
Among 1 peers in La Porte Gastroenterology Physician, average services per provider: 91. This provider delivers 16× the peer median.Open Payments
Industry payments received
All-time total
$182
Transactions
5
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Olympus America INC. | 4 | $164.06 | |
| Janssen Biotech, INC. | 1 | $17.56 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
960
Patients
256
Total drug cost
$87,536
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Pantoprazole Sodium | Generic | 211 | 69 | $2,986 |
| Omeprazole | Generic | 207 | 65 | $2,998 |
| Nortriptyline Hcl | Generic | 86 | 18 | $988 |
| Famotidine | Generic | 82 | 29 | $1,746 |
| Linzess (Linaclotide) | Brand | 54 | 15 | $45,077 |
| Lansoprazole | Generic | 46 | 16 | $1,786 |
| Dicyclomine Hcl | Generic | 44 | 19 | $1,475 |
| Esomeprazole Magnesium | Generic | 40 | 11 | $3,018 |
| Cholestyramine (Cholestyramine (With Sugar)) | Brand | 37 | 14 | $5,460 |
| Mesalamine | Generic | 34 | 0 | $16,056 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Nelson's medical specialty?
Dr. Mark Nelson practices Gastroenterology Physician in La Porte, IN.
Where does Dr. Mark Nelson practice?
Dr. Mark Nelson practices at 900 I St Fl 2, La Porte, IN 463505533. Office phone: 2198726566.
What is Dr. Mark Nelson's NPI?
Dr. Mark Nelson's National Provider Identifier (NPI) is 1891737763, issued by NPPES.
Does Dr. Mark Nelson accept Medicare assignment?
Yes. Dr. Mark Nelson accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Nelson commonly perform?
Top Medicare-reported procedures in 2023: 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 monito (HCPCS G0500); Established patient office or other outpatient visit (HCPCS 99213); Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385). Source: CMS Medicare Physician & Other Practitioners file.