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Gastroenterology

Mary P. Mortell, MD

Works at hospitals in Ann Arbor, MI · Michigan

Summary

Dr. Mary P. Mortell, MD is a gastroenterologist at 1500 E Medical Ctr, Suite 0331, Ann Arbor, MI 48109. Phone: (734) 936-5738. Accepts Medicare assignment. In 2024, Mary P. Mortell had 197 Original Medicare patients and 291 services. NPI 1851370142. Source: CMS National Downloadable File, updated October 2, 2026; CMS Facility Affiliation Data, updated October 2, 2026; CMS Medicare Physician & Other Practitioners, data year 2024.

  • Specialty: Gastroenterologist (Medicare lists Gastroenterology)
  • Address: 1500 E Medical Ctr, Suite 0331, Ann Arbor, MI 48109 · Directions (17 more locations)
  • Phone: (734) 936‑5738
  • Medicare: Accepts Medicare assignment
  • Hospital: University of Michigan Health System
  • Group practice: Regents of the University of Michigan
  • Medical school: University Of Michigan Medical School · graduated 1989 (37 years since medical school)
  • Gender (as listed): Female
  • Telehealth: offered

From official Medicare data

This page shows what Medicare's official clinician data says about Mary P. Mortell, joined by NPI number (data updated October 2, 2026). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

Quick answers

Does Mary P. Mortell accept Medicare assignment?
Yes. Medicare's clinician data says Mary P. Mortell accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
How many Medicare patients does Mary P. Mortell see?
In 2024, CMS data shows 197 Original Medicare patients and 291 services for Mary P. Mortell. This counts Original Medicare only and measures volume, not quality.
What is Mary P. Mortell's NPI number?
1851370142. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Medicare activity in 2024

Official CMS public-use data for Mary P. Mortell, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Original Medicare patients197
Services billed to Medicare291
Different services or procedures29
Participating Medicare providerYes
Average age of these patients69

Most frequent services

  1. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)48 services
  2. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)39 services
  3. Biopsy of large bowel using a flexible endoscope (45380)26 services
  4. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)21 services
  5. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)14 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

  • High blood pressure68%
  • High cholesterol60%
  • Arthritis34%
  • Depression30%
  • Anxiety30%
  • Diabetes26%

Hospitals where Mary P. Mortell works

Medicare's Facility Affiliation Data lists Mary P. Mortell at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

Practice locations

Addresses where Mary P. Mortell is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 18; the Medicare profile lists all.

Group practices

Medicare enrollment lists Mary P. Mortell as a member of this group (CMS data updated October 2, 2026).

  • Regents of the University of Michigan3,346 clinicians in the group

Specialties

Find other Gastroenterology doctors in Michigan →

Other gastroenterologists in Ann Arbor

Clinicians with the same Medicare primary specialty in Ann Arbor, MI — not a recommendation.

All gastroenterologists in Ann Arbor →

Other clinicians in Regents of the University of Michigan

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

Clinician information

CredentialMD
Medical schoolUniversity Of Michigan Medical School
Graduation year1989 (37 years since medical school)
Gender (as listed)Female
Medicare assignmentAccepts (Medicare-approved amount as full payment)
TelehealthOffers telehealth services
NPI (National Provider Identifier)1851370142
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
  2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
  3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
  4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
  5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  6. Medicare Care Compare — official Medicare tool to look up clinicians