Doctor profile · Federal record
Dr. Mark Zeglis, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Ypsilanti, MI
- NPI 1497898233
- Accepts Medicare
- 25 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
5300 Elliott Dr
Ypsilanti, MI 481978632
(734) 434-6262
fax (734) 712-2820
Credentials & registration
- NPI registered
- February 2007 — 19 yrs on file
- Profile last updated
- September 9, 2025
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Michigan #4301083313
- Medicaid
- MI #5175340
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1497898233. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
399
Distinct HCPCS
10
Medicare allowed
$63,553
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 86 | 84 | $258 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 79 | 77 | $177 | |
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 58 | 56 | $122 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 45 | 37 | $51 | |
43235 |
Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 34 | 34 | $94 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 26 | 26 | $155 | |
G0105 |
Colorectal cancer screening; colonoscopy on individual at high risk | 24 | 24 | $189 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 19 | 14 | $76 | |
45378 |
Diagnostic exam of large bowel using a flexible endoscope | 14 | 14 | $173 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 14 | 14 | $176 |
In context: peer comparison
Among 14 peers in Ypsilanti Gastroenterology Physician, average services per provider: 37. This provider delivers 11× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
297
Patients
239
Total drug cost
$7,548
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Gavilyte-G (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 148 | 146 | $2,989 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 55 | 54 | $1,763 |
| Omeprazole | Generic | 27 | 11 | $546 |
| Pantoprazole Sodium | Generic | 22 | 0 | $564 |
| Colestipol Hcl | Generic | 17 | 0 | $1,151 |
| Peg-3350 and Electrolytes (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 17 | 17 | $341 |
| Gavilyte-C (Peg3350/Sod Sulf,Bicarb,Cl/Kcl) | Brand | 11 | 11 | $193 |
Hospital affiliations
Frequently asked questions
What is Dr. Mark Zeglis's medical specialty?
Dr. Mark Zeglis practices Gastroenterology Physician in Ypsilanti, MI.
Where does Dr. Mark Zeglis practice?
Dr. Mark Zeglis practices at 5300 Elliott Dr, Ypsilanti, MI 481978632. Office phone: 7344346262.
What is Dr. Mark Zeglis's NPI?
Dr. Mark Zeglis's National Provider Identifier (NPI) is 1497898233, issued by NPPES.
Does Dr. Mark Zeglis accept Medicare assignment?
Yes. Dr. Mark Zeglis accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mark Zeglis commonly perform?
Top Medicare-reported procedures in 2023: Removal of polyps or growths of large bowel using an endoscope with mechanical snare (HCPCS 45385); Initial hospital care with moderate level of medical decision making (HCPCS 99223); Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239). Source: CMS Medicare Physician & Other Practitioners file.