The Medical Walk-In Unit offers another care option for patients (18 and over) who are unable to see their regular physician, are without a regular physician or are visiting the Boston area. We recommend that you consult with your primary care provider about any health concerns before visiting the Medical Walk-In Unit.All patients of the Medical Walk-In Unit receive a comprehensive evaluation and treatment of non-life-threatening illnesses and injuries.Patients are seen on a first-come, first-served basis, with extremely urgent cases receiving priority attention.


Our physicians are all affiliated with Harvard Medical School and are members of clinical departments and divisions at Mass General. In addition to diagnosing and treating adult urgent medical problems of all types, the Medical Walk-In Unit also offers:

  • Nebulizer therapy for asthma flares
  • Blood work and EKGs authorized by Mass General physicians
  • Minor dressing changes
  • Blood pressure checks
  • Blood sugar checks
  • Oxygen saturations
  • Pregnancy tests
  • TB testing and follow-up readings
  • School and employment immunizations provided Monday-Friday, 8:30 am to 4:00 pm. Not all immunizations available, please call 617-726-2707 for information
  • School and employment physicals. Limited hours, please call 617-726-2707 in advance

Patients can walk-in to receive care or call ahead with specific questions.

Hours of Operation

The Medical Walk-In Unit is open every day except Thanksgiving and Christmas. 

  • Monday-Friday, 8:30 am to 8:00 pm
  • Weekends and holidays, 9:30 am to 4:00 pm

If the Medical Walk-In Unit is experiencing high patient volume, we may be required to close prior to the posted hours. Please arrive as early as possible and register in advance. To register, contact the Mass General Registration and Referral Center at 866-211-6588.


The Medical Walk-in Unit accepts most major health insurance carriers, managed care plans and Medicaid. If your health plan requires authorization, call your primary care physician prior to receiving care, to arrange for your physician’s office to send an insurance referral. Copayments are accepted at the time of service.

The MWI Unit provides medical care to patients regardless of insurance coverage. Our visits are processed as "outpatient hospital visits", which may change how your health insurance company pays for your care. Some insurances now have deductibles and co-insurance. Look on your health insurance card or call your Health insurance company to better understand your out of pocket expenses.

Uninsured or underinsured patients might be eligible for financial assistance through Mass General’s Office of Financial Services. Please call them directly at 617-726-2191.