Gastroenterologist in New Jersey - Mountainside Medical Center
Gastroenterology • Hackensack, NJ • Multiple locations including Hackensack Meridian Mountainside Medical Center in Montclair, NJ and Mountainside Medical Group locations locations
Clinic Type
Gastroenterology
Address
1 Bay Ave., Montclair, NJ 07042
Phone
(866) 999-5162
ardentcustomerservice@ensemblehp.com
Opening Hours
Not published — contact the clinic to confirm hours.
Services Offered
Technology & Equipment
Team
Insurance & Payment
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referral required for appointments, phone appointment scheduling
Languages Spoken
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FAQs
Appointments require a referral?
Yes, a physician’s referral is required. Call to schedule.
What procedures are offered in the GI endoscopy suite?
Upper endoscopy (EGD), small bowel capsule endoscopy, flexible sigmoidoscopy, endoscopic ultrasound, ERCP, colonoscopy, ablation for Barrett’s Esophagus (BARRX).
Social Media
Photos








What Patients Say
Overall sentiment across review platforms: mixed
- Mountainside Medical Group official provider profiles: Generally high individual physician ratings (e.g., 4.6–4.9/5 range for many gastroenterologists) (Varies by provider, typically hundreds of reviews per doctor)
- Healthgrades (specific to Dr. Masood Rizvi): 2.9/5 (8 reviews)
- Yelp (hospital-wide reviews): 2.2/5 (146 reviews)
- Momentary Labs (via CMS data): 2/5 stars (HCAHPS) (283 patient surveys)
Patients praise
- Compassionate and understanding staff in certain departments
- Highly rated individual gastroenterologists by patients (e.g., ratings often above 4.5/5)
- Successful detection and treatment of complex conditions reported by patients
- Cleanliness of the facility noted as a strength in patient surveys
Common complaints
- Long wait times
- Perceived lack of provider attentiveness or trust in medical decisions
- Challenges with appointment scheduling and office communication
- Below-average hospital ratings for nurse and doctor communication in HCAHPS surveys
- General hospital facility concerns regarding noise and staff responsiveness
"I've had a great experience under Dr. Shah's care! Everyone in the office is incredibly nice and welcoming... I'm so happy to have been referred to him!"
— Mountainside Medical Group Patient Review"I had two visits with this doctor regarding pain on the upper right side of my stomach, and his response was that I was under stress... Overall this doctor Massod is not good at all."
— Healthgrades Patient Review"Thank you to Cynthia in the Emergency Department for being so caring and understanding."
— Yelp Hospital ReviewSynthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].
In the News
- Rosemarie Arena, M.D. - Mountainside Medical Center — Mar 29, 2026
- Dr. Sameet Shah, MD - Gastroenterologist in Verona, NJ — Jan 23, 2026
- Mountainside Medical Group - Gastroenterology (Verona) — Oct 13, 2025
Information sourced from the clinic's website as of July 11, 2026.
More gastroenterology clinics in Hackensack
Summary: Hackensack Meridian Health (HMH) is a nonprofit hospital network based in Edison, New Jersey, formed in 2016 from the merger of Hackensack University Medical Center and Meridian Health. It is the largest healthcare provider in New Jersey and includes academic centers, acute-care facilities, and research hospitals. HMH offers expert care across locations with online appointment booking, virtual visits, and patient bill payment. It is affiliated with the Hackensack Meridian School of Medicine and maintains active teaching programs. The network operates under a single integrated system serving New Jersey, with extensive services in health care and related fields. Gastroenterology focus: - HMH provides gastroenterology services through its affiliated hospitals and centers as part of its comprehensive digestive health care within the network. Specific physician access, locations, and appointment options can be found via the Hackensack Meridian Health site.
Summary: - GANJ (Gastroenterology Associates of New Jersey) is a multidisciplinary digestive health practice with 28 offices across Bergen, Passaic, Morris, Hudson, Ocean, and Essex counties in New Jersey. - Headquarters: Woodland Park, NJ. Founded in 2009; employs about 34 staff. - Notable reach: Also maintains a presence in India. - Note on user query: If you’re seeking information specifically about Hackensack Digestive Disease Associates in Hackensack, this page represents GANJ, a broader New Jersey gastroenterology network, but does not provide detail on Hackensack Digestive Disease Associates as a standalone entity. For Hackensack-specific data (locations, providers, services), consider checking Hackensack Digestive Disease Associates’ own site or Hackensack Meridian Health-affiliated gastroenterology pages.
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