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Clinic Type

Nephrology

Address

Lowell, Chelmsford, and Methuen, MA (serving Merrimack Valley)

Phone

978-453-1811

Email

Opening Hours

Not published — contact the clinic to confirm hours.

Services Offered

  • Kidney disease treatment
  • Hypertension care
  • Kidney stone prevention
  • Pre-dialysis care
  • Post-transplant care
  • Chronic kidney disease management
  • In-center dialysis
  • Home dialysis
  • Dialysis facility medical direction

Team

  • Douglas E. Mesler, MD, MPH, Internal Medicine and Nephrology; formerly Clinical Director for Nephrology at Boston Medical Center; moved practice to Lowell in 2005 — Physician / Medical Director
  • Joseph P. Rossacci, MD, Internal Medicine; Nephrology fellowship at Beth Israel Deaconess Medical Center; member since 2007 — Physician / Medical Director (Fresenius Chelmsford dialysis facility)
  • Ashish Mahajan, MD, MPH, MS, Residency at St. Elizabeth’s Hospital; Nephrology fellowship at Tufts Medical Center; member since 2007 — Physician

Insurance & Payment

Languages Spoken

FAQs

What conditions do you treat?

All types of acute and chronic kidney disease, hypertension, kidney stone prevention, pre-dialysis, and post-transplant.

Where do you provide care?

Patients receiving chronic in-center and home dialysis in Lowell, Chelmsford, and Methuen.

What types of kidney disease do you care for?

We care for all types of acute and chronic kidney disease, hypertension, kidney stone prevention, pre-dialysis, and post-transplant.

Do you treat patients on dialysis?

We see patients receiving chronic in-center and home dialysis in Lowell, Chelmsford, and Methuen.

Where are your facilities located?

Locations include Lowell, Chelmsford, and Methuen in the Merrimack Valley.

Who are the physicians and what are their credentials?

Physicians include Douglas E. Mesler, MD, MPH; Joseph P. Rossacci, MD; Ashish Mahajan, MD, MPH, MS, with internal medicine and nephrology certification. (More bios available on site.)

Photos

What Patients Say

Overall sentiment across review platforms: positive

  • Healthgrades (Dr. Tatiana Thom, MD): 5.0 star rating (9 reviews (7 with written review))
  • Southcoast Health (Ye Tun, MD): 4.9 (227 ratings (51 patient comments))
  • Sharecare (Dr. Tatiana Thom, MD): 5.0/5 (1 review)

Patients praise

  • Doctors who listen thoroughly and spend time with patients
  • Clear explanations of conditions, labs, and treatment options
  • Attentive, friendly staff and good office experiences
  • Convenience elements reported (e.g., telehealth options, scheduling ease, short wait times)

Common complaints

  • No specific negative complaints were captured in the provided results (mostly favorable review excerpts).

"“She combine[s] deep medical knowledge with a kind and reassuring manner that makes you feel completely at ease.”"

Sharecare profile for Dr. Tatiana Thom, MD

"“I was a new patient to Dr Tun, I was extremely satisfied with his service… scheduled an additional labs to target the cause for my visit.”"

Southcoast Health, Ye Tun MD (Ratings & Reviews)

"“Dr. Thom takes the time to truly listen—never rushing through appointments—and ensures that every concern is addressed thoughtfully.”"

Healthgrades profile for Dr. Tatiana Thom, MD

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.

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