Mary Ann Stevenson, MD

Medicare activity in 2024

Official CMS public-use data for Mary Ann Stevenson, 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. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)34 services
2. Complex radiation therapy planning (77263)11 services
3. Obtaining data needed to develop the optimal radiation treatment, 3 or more treatment areas or any number of treatment areas where special treatment is involved (77290)11 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 cholesterol74%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)53%
• Arthritis41%
• Osteoporosis32%
• Anxiety31%

Hospitals where Mary Ann Stevenson works

Medicare's Facility Affiliation Data lists Mary Ann Stevenson 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.

• Beth Israel Deaconess Medical CenterBoston, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220086
• Winchester HospitalWinchester, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220105

Practice locations

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

• 148 Chestnut StNeedham, MA 02492 (781) 983‑9088
• 330 Brookline AveBoston, MA 02215 (617) 754‑8612
• 620 Washington St, Suite 1Winchester, MA 01890 (781) 983‑9088

Group practices

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

• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc1,740 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Massachusetts →

Other radiation oncologists in Needham

Clinicians with the same Medicare primary specialty in Needham, MA — not a recommendation.

• Kathryn Huber, MD
• Irving D. Kaplan, MD
• Brigid M. O'Connor, MD
• Theodore S. Hong, MD
• Joanne W. Jang, MD
• Abram Recht, MD
• Joseph A. Aronovitz, MD
• Stuart M. Berman, MD

All radiation oncologists in Needham →

Other clinicians in Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

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

• Ai-Ris Y. Collier, MD
• Christopher R. Iriarte, MD
• Susan F. Herzlinger Botein, MD
• Francine Ton Nghiem, MD
• Ian M. Kelly, MD
• Brian J. Carney, MD

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