Mary J. Fietz, MD

Medicare activity in 2024

Official CMS public-use data for Mary J. Fietz, 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.

Most frequent services

1. Pathology examination of tissue using a microscope, intermediate complexity (88305)510 services
2. Special stained specimen slides to examine tissue, each additional procedure (88341)417 services
3. Special stained specimen slides to examine tissue, initial procedure (88342)170 services
4. Microscopic genetic analysis of tumor, manual (88360)96 services
5. Pathology examination of tissue using a microscope, moderately high complexity (88307)87 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 pressure75%
• High cholesterol75%
• Arthritis56%
• Ischemic heart disease44%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)36%
• Anxiety31%

Hospitals where Mary J. Fietz works

Medicare's Facility Affiliation Data lists Mary J. Fietz 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.

• Arizona Orthopedic and Surgical Specialty HospitalPhoenix, AZ · Acute Care Hospital · Emergency services: not listed by Medicare · CCN 030112
• Dignity Health Arizona General HospitalMesa, AZ · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 030139
• St Josephs Hospital and Medical CenterPhoenix, AZ · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 030024

Practice locations

Addresses where Mary J. Fietz is enrolled with Medicare (CMS data updated October 2, 2026).

• 350 W Thomas RdPhoenix, AZ 85013 (602) 406‑3000

Group practices

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

• St Josephs Pathology13 clinicians in the group

Specialties

• Pathologyprimary

Find other Pathology doctors in Arizona →

Other pathologists in Phoenix

Clinicians with the same Medicare primary specialty in Phoenix, AZ — not a recommendation.

• Ghassan Ibrahim, MD
• Abhinav Grover, MD
• Rachel A. Mariani, MD
• Dan W. Hobohm, MD
• David F. Carpentieri, MD
• Kirk K. Lin, MD
• David Borzik, MD
• Qing J. Cao, MD

All pathologists in Phoenix →

Other clinicians in St Josephs Pathology

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

• Jessica K. Daniels, MD
• Erik Pearson, DO

Clinician information

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