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Summary: - Northwell Health is merging with Nuvance Health (completed in 2025), expanding its network to include Nuvance’s facilities and services. - The Kingston area entry specifically references gastroenterology services within the Nuvance Health network before or during the integration with Northwell Health; Kingston gastroenterology would be part of Nuvance Health’s integrated care offerings, leveraging Northwell’s larger system post-merger. Key context: - Nuvance Health operates hospitals, medical practices, and care centers in the Hudson Valley (NY) and western Connecticut; it became part of Northwell Health in 2025. - If you’re seeking Kingston-based gastroenterology under Northwell Health, expect access through the integrated network formerly under Nuvance Health, now partnered with Northwell. If you want, I can pull current Kingston gastroenterology options within the Northwell-Nuvance network and list specific clinics, physicians, and contact details.

Clinic Type

Gastroenterology

Address

1240 Ulster Ave., Kingston, NY 12401

Phone

(845) 876-3003

Email

Opening Hours

Monday - Friday: 9 am - 4:45 pm

Services Offered

  • Gastroenterology
  • Digestive Health Institute

Team

  • Robert A. Rosenzweig, MD — Specialty Care, Gastroenterology
  • Hannah Goldwater, APRN — Specialty Care, Gastroenterology

Insurance & Payment

  • major insurances (patient note: “accepting New Patients and accept most major insurances”)

Not explicitly listed by plan name; statement indicates acceptance of most major insurances.

Languages Spoken

FAQs

What services are offered at the Kingston gastroenterology office?

Our Gastroenterology team specializes in the diagnosis, treatment and prevention of diseases affecting the gastrointestinal tract, liver and pancreas, including complex digestive disorders.

What procedures are performed?

Colonoscopy, Barrett’s esophagus testing, Breath testing for bacterial overgrowth, Manometry, Sigmoidoscopy.

Photos

What Patients Say

Overall sentiment across review platforms: mixed

  • Nuvance Health / Northwell Health Find Care portal (Provider-specific: Dr. Robert A. Rosenzweig): 4.5 out of 5 stars (based on 607 ratings and 11 reviews) (607 ratings, 11 reviews)
  • WebMD (Provider-specific: Dr. Robert A. Rosenzweig): 2.5 out of 5 stars (20 ratings, 1 review)
  • Better Business Bureau (BBB) - Nuvance Health (overall entity): Not rated; F rating based on complaints (12 complaints filed; 10 unanswered)

Patients praise

  • Patients appreciate professional, friendly, and caring demeanor of staff and some providers
  • Some patients report successful, well-explained procedures and thorough care
  • Positive feedback on clear communication during procedures

Common complaints

  • Reports of poor billing experiences, including double or triple billing issues
  • Specific patient complaints regarding perceived lack of empathy, feeling rushed, and gaslighting by individual providers
  • Complaints regarding office responsiveness and patient support

"Professional yet friendly and CARING demeanor, expert knowledge, well prepared, did not rush the visit. And office staff and assistants are top notch too!"

Nuvance Health / Northwell Health Find Care portal patient review (12/8/2025)

"DO NOT SEE THIS DOCTOR!!! I brought my sister to this "doctor" yesterday and he gaslit her to tears. No assistance, no comfort zero human support was offered to her."

WebMD patient review (8/1/2025)

Synthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].

Information sourced from the clinic's website as of July 11, 2026.

More gastroenterology clinics in Kingston

Kingston, NY·Gastroenterology

WMCHealth Physicians Gastroenterology at WMCHealth Medical … Kingston - WMCHealth is a nonprofit, integrated health network based in Valhalla, NY, serving the Hudson Valley with nine hospitals, over 60 ambulatory sites, and a large roster of specialized centers. - The network includes extensive gastroenterology services through its physician practices, providing comprehensive care in digestive health, endoscopy, and related GI specialties across its facilities. - WMCHealth operates as a major academic medical system with Level I trauma centers, a pediatric hospital, transplant center, and broad subspecialty services, serving roughly 2.5 million residents across more than 6,000 square miles. - Contact/summary details: Headquarters at 100 Woods Road, Valhalla, NY 10595. Main phone: 914-493-7000. Website: wmchealth.org. Follow on social: Facebook and Instagram @WMCHealth. If you’re specifically seeking information about WMCHealth Gastroenterology in Kingston, NY: Kingston is outside the core Valhalla/North Hudson Valley footprint mentioned for WMCHealth’s primary facilities. WMCHealth’s publicly highlighted gastroenterology services are centered around its Valhalla-based network and other campuses in the Hudson Valley; Kingston-specific gastroenterology services would require checking the WMCHealth site for Kingston-area providers or nearest ambulatory sites.

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Kingston, NY·Gastroenterology

Hal N. Buch, MD is a Kingston, NY-based gastroenterologist at Buch Gastroenterology. Services cover common GI conditions including acid reflux, gastritis, Barrett’s esophagus, celiac disease, irritable bowel syndrome, Crohn’s disease, with procedures such as colonoscopy, upper endoscopy, and esophageal dilation. They also offer IV vitamin infusion therapy. The practice is headquartered in Kingston, NY, with two offices in the area, and is privately owned. Contact: 845-331-8146 or 845-293-6045. Website: buchgastroenterology.com.

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