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Concept annotation tool for Electronic Health Records

Project description

Medical oncept Annotation Tool

MedCAT can be used to extract information from Electronic Health Records (EHRs) and link it to biomedical ontologies like SNOMED-CT and UMLS. Paper on arXiv.


A demo application is available at MedCAT. Please note that this was trained on MedMentions and contains a very small portion of UMLS (<1%).


A guide on how to use MedCAT is available in the tutorial folder. Read more about MedCAT on Towards Data Science.

Papers that use MedCAT

Related Projects

  • MedCATtrainer - an interface for building, improving and customising a given Named Entity Recognition and Linking (NER+L) model (MedCAT) for biomedical domain text.
  • MedCATservice - implements the MedCAT NLP application as a service behind a REST API.
  • iCAT - A docker container for CogStack/MedCAT/HuggingFace development in isolated environments.

Install using PIP (Requires Python 3.6.1+)

  1. Install MedCAT

pip install --upgrade medcat

  1. Get the scispacy models:

pip install

  1. Downlad the Vocabulary and CDB from the Models section bellow

  2. Quickstart:

from import CAT
from medcat.utils.vocab import Vocab
from medcat.cdb import CDB 

vocab = Vocab()
# Load the vocab model you downloaded
vocab.load_dict('<path to the vocab file>')

# Load the cdb model you downloaded
cdb = CDB()
cdb.load_dict('<path to the cdb file>') 

# create cat
cat = CAT(cdb=cdb, vocab=vocab)

# Test it
text = "My simple document with kidney failure"
doc_spacy = cat(text)
# Print detected entities

# Or to get an array of entities, this will return much more information
#and usually easier to use unless you know a lot about spaCy
doc = cat.get_entities(text)


A basic trained model is made public for the vocabulary and CDB. It is trained for the ~ 35K concepts available in MedMentions. It is quite limited so the performance might not be the best.

Vocabulary Download - Built from MedMentions

CDB Download - Built from MedMentions

(Note: This is was compiled from MedMentions and does not have any data from NLM as that data is not publicaly available.)


If you have access to UMLS or SNOMED-CT and can provide some proof (a screenshot of the UMLS profile page is perfect, feel free to redact all information you do not want to share), contact us - we are happy to share the pre-built CDB and Vocab for those databases.


Entity extraction was trained on MedMentions In total it has ~ 35K entites from UMLS

The vocabulary was compiled from Wiktionary In total ~ 800K unique words

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A big thank you goes to spaCy and Hugging Face - who made life a million times easier.


    title={MedCAT -- Medical Concept Annotation Tool},
    author={Zeljko Kraljevic and Daniel Bean and Aurelie Mascio and Lukasz Roguski and Amos Folarin and Angus Roberts and Rebecca Bendayan and Richard Dobson},

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