# The Complete Guide to Medical AI Data Labeling in 2026

## Text Annotation for NLP
NLP, named entity recognition, LLMs, and other AI methods generate insights from both structured and unstructured data stored as text.

Our annotation platform can quickly tag thousands of text strings, conversations, paragraphs, and more, organizing large volumes of text data for AI applications.

### Use cases

#### Unstructured clinical notes
Tag conditions and severity. Identify drugs prescribed. Tag symptoms after a drug protocol begins, and challenges patient experiences related to adherence.

#### Scientific literature
Classifying research citations and determining drug-target relationships in pharmacological literature.

#### Chatbot messages
Tag words and phrases that communicate intent, the severity of the patient condition, and act with appropriate urgency. Identify tone and sentiment to offer suggestions and improve experience.

#### Insurance claims
Identify interventions to contextualize and rationalize most recent intervention. Tag payouts and procedures from past claims. Identify prescribing behavior of HCPs.

#### Social media
Tag medical misinformation. Identify sentiment and symptoms shared when patients discuss a medication in a public forum.

### Annotation types
- **Classification**
- **Entity annotation**
- **Entity linking**
- **Sentiment annotation**
- **Semantic annotation**

## Testimonials

### Trusted by AI leaders across healthcare

“Annotations that would have taken me 3 months to complete with our prior data annotation system, Centaur.ai completed in only 2 weeks.”

**Eric Olson**  
Founder and CEO  
[Read the story →](https://7724356.fs1.hubspotusercontent-na1.net/hubfs/7724356/Case%20Study%201-pagers/Centaur%20Labs_CaseStudy_Consensus_FINAL.pdf)

"Their user base combined with their application allowed us to easily and efficiently scale up our training data in a very controlled way that ensured it was high quality based on metrics we cared about in-house."

**Josh Nicholson**  
Co-Founder and CEO

"I get pitched on annotation tools all the time, and Centaur.ai is simply the best. They offer you the accuracy and sophistication of medical experts at the price and speed of Mechanical Turk."

**Dhruv Gulati**  
CEO

## More labeling solutions

### Text  
- Unstructured clinical notes  
- Scientific text  
- Chatbots  
- And more  
[Learn more →](https://centaur.ai/data-type/datatype-text)

### Audio  
- Heart auscultation  
- Lung auscultation  
- Artery auscultation  
- And more  
[Learn more →](https://centaur.ai/data-type/datatype-audio)

### Images  
- Ultrasound  
- External images  
- X-ray  
- And more  
[Learn more →](https://centaur.ai/data-type/datatype-images)

### Video  
- Surgical  
- Clinical sessions  
- And more  
[Learn more →](https://centaur.ai/data-type/datatype-video)

### Waveform  
- EEG  
- ECG  
- PPG  
- And more  
[Learn more →](https://centaur.ai/data-type/datatype-waveform)

**Accelerate your AI development today.**  
[Book a Demo](https://centaur.ai/demo-old)

**Accurate and scalable data labeling and model evaluation**