Jillian S. Gruber, MD

Medicare activity in 2024

Official CMS public-use data for Jillian S. Gruber, 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)76 services
2. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)36 services
3. Injection into tendon or ligament (20550)21 services
4. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)17 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 pressure59%
• Arthritis59%
• High cholesterol58%
• Depression34%
• Anxiety31%
• Diabetes29%

Hospitals where Jillian S. Gruber works

Medicare's Facility Affiliation Data lists Jillian S. Gruber 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.

• Cambridge Health AllianceCambridge, MA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 220011

Practice locations

Addresses where Jillian S. Gruber is enrolled with Medicare (CMS data updated October 2, 2026).

• 103 Garland StEverett, MA 02149 (617) 389‑6270
• 1493 Cambridge StCambridge, MA 02139 (617) 665‑1000

Group practices

Medicare enrollment lists Jillian S. Gruber as a member of this group (CMS data updated October 2, 2026).

• Cambridge Public Health Commission656 clinicians in the group

Specialties

• Orthopedic Surgeryprimary

Find other Orthopedic Surgery doctors in Massachusetts →

Other orthopedic surgeons in Massachusetts

Clinicians with the same Medicare primary specialty in Massachusetts — not a recommendation.

• Frank X. Pedlow Jr., MD
• Mercedes D. Vondeck, MD
• John A. Willis, MD
• Dang-Khoa Vo, MD
• Jacob M. Drew, MD
• Paul Tornetta Iii, MD
• Zainab Ibrahim, MD
• Joseph J. Czarnecki, MD

All orthopedic surgeons in Massachusetts →

Other clinicians in Cambridge Public Health Commission

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

• Stacy Foote
• Hashim Ayyad, MD
• Gregory J. Lines, MD
• Melanie J. Brunt, MD
• Marshall L. Reiner, MD
• Sana Sheikh

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