Mark Zeglis, M.D.
NPI 1497898233 · Gastroenterology Physician · Ypsilanti, MI
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Zeglis, M.D. is a Gastroenterology Physician provider in Ypsilanti, MI (NPI 1497898233).
Provider details
- NPI number
- 1497898233
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 4301083313 (MI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
456 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 97 | $173 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 79 | $257 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 57 | $98 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 41 | $179 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 39 | $50 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 169 | 168 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Peg-3350 and Electrolytes | 45 | 44 |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 38 | 38 |
| Pantoprazole Sodium | 21 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 13 | 13 |
| Mesalamine | 11 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-14
- Last updated
- 2025-09-09
- Certified
- 2025-09-09
Frequently asked questions
- What is Mark Zeglis's NPI number?
- Mark Zeglis's National Provider Identifier (NPI) is 1497898233, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Zeglis's specialty?
- Mark Zeglis is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Zeglis located?
- Mark Zeglis's practice location on file with NPPES is 5300 Elliott Dr, Ypsilanti, MI 48197-8632.
- What is Mark Zeglis's phone number?
- The practice phone number listed in the NPPES registry for Mark Zeglis is (734) 434-6262.
- Does Mark Zeglis accept Medicare?
- Mark Zeglis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Zeglis's NPI active?
- Yes — Mark Zeglis's NPI (1497898233) is active in the NPPES registry as of the last update on 2025-09-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.