Dr. Lennerz specializes in diagnostic molecular genetic pathology, specifically clinical genome and exome sequencing (CGES) at Massachusetts General Hospital.



Centers & Specialties

Cancer Center

Clinical Interests
  • Molecular pathology
  • Diagnostic molecular pathology
Medical Education
  • MD, PhD, University of Erlangen - Nuernberg
  • Residency, Barnes-Jewish Hospital
  • Fellowship, Barnes-Jewish Hospital|Fellowship, Massachusetts General Hospital
Board Certifications
  • Pathology
  • Molecular Genetic Pathology
Foreign Languages
  • German
  • Boston: Massachusetts General Hospital
Insurances Accepted
  • Aetna Health Inc.
  • Beech Street
  • Blue Cross Blue Shield - Blue Care 65
  • Blue Cross Blue Shield - Indemnity
  • Blue Cross Blue Shield - Managed Care
  • Blue Cross Blue Shield - Partners Plus
  • BMC HealthNet Mass Health MCO/ACO
  • Cigna (PAL #'s)
  • Commonwealth Care Alliance
  • Fallon Community HealthCare
  • Great-West Healthcare (formally One Health Plan)
  • Harvard Pilgrim Health Plan - ACD
  • Harvard Pilgrim Health Plan - PBO
  • Health Care Value Management (HCVM)
  • Humana/Choice Care PPO
  • MassHealth
  • Medicare
  • Medicare - ACD
  • Neighborhood Health Plan - ACD
  • Neighborhood Health Plan - PBO
  • OSW - Maine
  • OSW - New Hampshire
  • OSW - Rhode Island
  • OSW - Vermont
  • Private Health Care Systems (PHCS)
  • Railroad Medicare
  • Railroad Medicare - ACD
  • Senior Whole Health
  • TriCare
  • Tufts Health Plan
  • Unicare
  • United Healthcare (non-HMO) - ACD
  • United Healthcare (non-HMO) - PBO
  • Well Sense Pediatrics

Note: This provider may accept more insurance plans than shown; please call the practice to find out if your plan is accepted.

Patient Age Group
Provider Gender


Dr. Lennerz is board certified by the American Board of Pathology and the American Board of Medical Genetics. He joined the Massachusetts General Hospital Department of Pathology and Center for Integrated Diagnostics as a staff pathologist  in 2014, and is an assistant professor at Harvard Medical School. Dr. Lennerz trained as a pathologist assistant in Berlin, Germany in 1994 and studied both medicine and molecular medicine at the University of Erlangen, Germany where he also received his MD and PhD. He completed his residency training in anatomic pathology in 2008, and a fellowship in molecular genetic pathology in 2009 at Washington University in St. Louis, MO. After completing a two-year gastrointestinal and liver pathology fellowship at Massachusetts General Hospital in 2011, he led a research group on biomarkers in lymphoma at Ulm University, Germany. His interests are tissue-based biomarkers, and financial sustainability of molecular genetic diagnostics. . Early in 2015 Dr. Lennerz joined the Cancer Center's physician staff at Mass General, and began presenting at the Cancer Center Grand Rounds.

Research & Publications

Research Summary

Dr. Lennerz has research interests in tissue-based biomarkers in cancer, digital pathology, and migraine-pain research.


View my most recent publications at PubMed


  1. Comparison of MelanA/MART-1 and HMB45 labeling in desmoplastic melanoma. Weissinger SE, Lennerz JK. Mod Pathol. 2014 Oct;27(10):1421-3. doi: 10.1038/modpathol.2014.59. No abstract available.
  2. A diagnostic algorithm to distinguish desmoplastic from spindle cell melanoma. Weissinger SE, Keil P, Silvers DN, Klaus BM, M?ller P, Horst BA, Lennerz JK. Mod Pathol. 2014 Apr;27(4):524-34. doi: 10.1038/modpathol.2013.162. Epub 2013 Sep 20.
  3. A nuclear circularity-based classifier for diagnostic distinction of desmoplastic from spindle cell melanoma in digitized histological images. Sch?chlin M, Weissinger SE, Brandes AR, Herrmann M, M?ller P, Lennerz JK. J Pathol Inform. 2014 Oct 21;5:40. doi: 10.4103/2153-3539.143335. eCollection 2014.
  4. Absence of BRAF and KRAS hotspot mutations in primary mediastinal B-cell lymphoma. Nagel PD, Feld FM, Weissinger SE, Stenzinger A, M?ller P, Lennerz JK. Leuk Lymphoma. 2014 Oct;55(10):2389-90. doi: 10.3109/10428194.2013.878461. Epub 2014 Feb 4. No abstract available.


Pathology Associates
55 Fruit Street
Boston, MA 02114-2696
Phone: 617-726-2971