CHA Occupational Health

Alert: Most CHA centers and services will be closed during the Martin Luther King Jr. holiday. Please see this schedule for details.

About Us

The CHA Occupational Health Program partners with local businesses to support all types of work-related health issues.

Our team is led by Stefanos Kales, MD, MPH, FACP, FACOEM, who is known internationally for his clinical expertise and research. All our doctors hold faculty positions at Harvard Medical School and the T.H. Chan Harvard School of Public Health.

We are proud to partner with businesses of every size - more than 800 clients strong. We have expertise in manufacturing, biotech/pharma, retail and the public sector.

We work closely with clients on medical surveillance programs and chemical exposure assessment, and support a wide range of regulatory needs, such as OSHA and DOT. Please call us to discuss your specific needs.

Our Location

We are located in Assembly Square in Somerville, MA. Clinic hours are Monday-Friday, 8:30 am - 5 pm.

Occupational Health Services

Customized plans to meet the unique needs of your company or organization.

Urgent Care

  • Minor lacerations
  • Contusions
  • Strains / Sprains
  • Minor fracture
  • Eye injuries


  • Physical Therapy
  • Hand Hardening
  • Occupational Therapy
  • Chemical Exposure

Specialty Care

  • Functional Capacity Evaluations (FCE)
  • Case Management
  • Disability Management
  • Independent Medical Exams (IME)
  • Repetitive Stress Injuries
  • Travel Medicine

Exams and Regulatory Evaluations

  • Pulmonary function testing
  • Pre-placement physicals
  • Drug and alcohol testing
  • Immunizations/vaccinations
  • Hearing testing
  • Medical surveillance (OSHA Required)
  • DOT Exams
  • Police/fire physicals
  • Fit for duty exams
  • Back injury prevention
  • Annual physicals
  • Immigration Physicals

Prevention and Assessment Services

  • Job Analysis
  • Orthotics/Prosthetics clinic
  • Ergonomic workstation evaluation
  • Safety/hazard identification
  • Corporate wellness
  • Primary Care at 13 area locations

OEM Clinic

The OEM Clinic helps people exposed to chemicals/toxic substances or who have experienced on-the-job injuries. These patients are often referred by primary care doctors, lawyers, unions or insurance companies/agencies.

    Contact Us

  • Occupational Health Program

    CHA Assembly Square Care Center 5 Middlesex Ave. | 1st Fl. Somerville, MA 02145
    P: (617) 591-4660 F: (617) 591-4693

    M - F: 8:30 am - 5 pm


  • Stephen Kales presented with award at the Fire, Rescue International Conference in San Antonio, Texas

    Chief Todd LeDuc (left) and Richard Miller of the International Association of Fire Chiefs (right) presenting Stephen Kales, MD, MPH, FACP, FACOEM (middle), with an award last week at the Fire, Rescue International Conference in San Antonio, Texas. The award was given in recognition of his research to improve firefighters’ well-being.