Pulmonary & sleep care in North Texas

Breathe easier with expert lung care you can trust.

Personalized lung and sleep care in Denton and Flower Mound. Meet Dr. Joe V M Devasahayam and find your next step toward better breathing.

(469) 299-4800

Dr. Devasahayam — Board-Certified Pulmonary & Critical Care

Board-CertifiedInternal Medicine, Pulmonology & Critical Care

Advanced DiagnosticsPFT & sleep studies

What We Do

Comprehensive care for every breath

Care for asthma, COPD, lung nodules and obstructive sleep apnea, with pulmonary function testing, sleep studies and hospital-based bronchoscopy.

Pulmonary Function Testing

Breathing tests that help assess lung function and guide diagnosis and care.

Learn more →

Sleep Studies

Evaluation and sleep studies for obstructive sleep apnea, with guidance on the next steps in your care.

Learn more →

Hospital-Based Bronchoscopy

Bronchoscopy is performed in hospitals. Our team will explain the procedure and confirm where it takes place.

Learn more →

Asthma & COPD Care

Personalized care to help manage symptoms and support your breathing.

Learn more →

Lung Nodules & Cancer Diagnosis

Evaluation of lung nodules and lung cancer diagnosis, with clear guidance through the diagnostic process.

Learn more →

Conditions We Treat

Specialized expertise across the spectrum

Our core areas of care include asthma, COPD, lung nodules and obstructive sleep apnea.

Asthma COPD & Emphysema Chronic Bronchitis Obstructive Sleep Apnea Insomnia Snoring Chronic Cough Shortness of Breath Pulmonary Fibrosis Interstitial Lung Disease Lung Nodules Lung Cancer Pneumonia Sarcoidosis Pulmonary Hypertension Bronchiectasis Respiratory Infections Occupational Lung Disease

Your physician

Meet Dr. Devasahayam

Board-certified in internal medicine, pulmonology and critical care, with fellowship training at the University of Missouri.

About your physician →

Close to home

Two North Texas offices

Visit us in Denton or Flower Mound. Monday to Friday · Call for hours and appointment availability.

Office details & directions →

Before your visit

Insurance & referrals

Call with your plan information so our team can help check participation and referral requirements before you schedule.

Call (469) 299-4800 →

Getting Started Is Simple

Your path to better breathing

We've made becoming a patient straightforward, so you can focus on feeling better.

Call Our Office

Call our team to discuss appointment availability and choose your preferred office.

Comprehensive Evaluation

A thorough review of your history, symptoms and appropriate testing, including hospital-based bronchoscopy when needed.

Personalized Plan

A clear, tailored treatment plan explained in language that makes sense.

Ongoing Support

Continued follow-up and coordination to keep you breathing your best.

Inside the practice

A look around our clinic

Dr. Devasahayam at his desk in the consultation office

Good To Know

Frequently asked questions

Many patients are referred by their primary care provider, but a referral is not always required. Some insurance plans do require one — we're happy to help you check. Call us at (469) 299-4800 and our team will guide you.

Please call our office with your insurance plan information to check participation and coverage before your visit.

Please bring a photo ID, your insurance card, a list of current medications, and any recent imaging (such as chest X-rays or CT scans) or test results from other providers. Arriving 15 minutes early helps us get you checked in smoothly.

We offer sleep studies to evaluate obstructive sleep apnea. Call our office to discuss testing arrangements and which study may be appropriate for you.

Call (469) 299-4800 for current appointment availability at either office. Your appointment is scheduled when our team confirms a date and time.

Take the first step toward easier breathing

Whether it's a nagging cough, restless nights, or a chronic lung condition — expert help is close to home. Call our office today.

Call (469) 299-4800