Contact & Locations

Capital Cardiovascular Specialists PLLC

The friendly staff at Capital Cardiovascular Specialists welcomes your call and looks forward to serving you. If you have any questions about our cardiology services, please call our office at (202) 466-3000, or use our secure online appointment request form.



Phone: (202) 466-3000 

Fax: (202) 466-3001


Washington, DC Location
2311 M Street NW, Suite 101
Washington, DC 20037

Validated parking available at PMI Parking Garage: 2300 M Street NW 

Clinton, MD Location
9001 Woodyard Road, Suite C
Clinton, MD 20735

Complimentary on-site parking available

Office Hours

Our regular office hours are 9 am to 5 pm. Dr. Howell sees patients for office visits as follows:

  • Wednesday: Clinton, MD
  • Monday, Thursday, Friday: Washington DC

Tuesdays are procedure days in the hospital or in the office.

Medical Emergencies

In the event of a life-threatening medical emergency, call emergency medical services at 911 immediately. DO NOT WAIT! Inform the emergency room staff that you are a patient of Dr. Shawn M. Howell and they will contact us.

After Hours Urgent Medical Needs

If you have an urgent medical need and need to talk to Dr. Howell after our regular hours, please call our office at (202) 466-3000. A doctor is on-call 24 hours a day. Your call will be returned promptly.

Insurance / Payment / Billing

At Capital Cardiovascular Specialists, we accept most major insurance plans. Please contact your insurance company or you may call our office at (202) 466-3000 to find out if we accept your insurance plan.

If your insurance plan requires you to pay a co-payment, co-insurance, and/or a deductible, you will need to pay at the time of your visit. For your convenience we accept cash, checks, Visa, MasterCard, Discover, and American Express.

You can pay your bill online, just enter your account number from your invoice and click 'Pay Now'  below and follow the prompts.

Account Number:

If you have a question related to your bill or insurance, please contact our billing specialists at (202) 466-3000.


If your insurance is an HMO/managed care plan and you are required to obtain a referral from your primary care physician, the referral must be obtained before you can be seen for an office visit. Please coordinate this with your primary care physician in advance. Appointments will be rescheduled if required referrals are not received in the office by the time of your visit.

Hospital Affiliations

Dr. Howell has hospital privileges at the following medical centers in the greater Washington, DC, metropolitan area:

Hospital Logos

Prescription Requests

Prescriptions and refills for established patients of Dr. Howell are routinely issued during our regular office hours (see above). You can make your request by calling our office at (202) 466-3000.

No refills are issued during the evenings, weekends, or holidays, as the doctor does not have access to your medical records during those times. It is helpful to anticipate your refill needs to avoid an interruption in your medication therapy.

American College Cardiology American Heart Association American Society of Nuclear Cardiology American Board of Internal Medicine