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About Me

Marisa Knag is a registered nurse, wife and mother of two children. Marisa graduated from Baylor University School of Nursing in May of 1999 and started her nursing career at Memorial Sloan Kettering Cancer Center in Pediatric Oncology. After a move to Texas, she continued her practice in pediatric allergy and immunology as well as adult outpatient surgery. Marisa and her family recently relocated to Darien, CT. She is looking forward to serving the community here by providing at-home visits under the direction of Dr. Kathleen Berchelmann.

In-Home COVID Testing Information

Do you offer rapid COVID tests?

We currently offer PCR nasal swab testing only. We hope to offer rapid tests and antibody tests in the near future.

What lab will process the COVID test?

We have a national account with Quest Diagnostics.

How quickly will we get test results?

Due to the large volume of testing being done at this time, we are seeing results come back between 3-5 days. A handful of tests have taken seven days to come back. Priority is given to patients preparing for surgery, people living in congregate care settings, and hospitalizations.

How will we receive test results?

You can receive results by phone call, text message, email, or by logging into our HIPAA compliant patient portal.

Will the testing be covered by insurance?

We accept all major insurance providers and healthshares, including Medicare and Husky. You may be billed an in-network office visit copay, but in most cases insurance waives copays for COVID-related care.

What insurance companies do you accept?

Please see complete list under Dr. Berchelmann’s profile.

Is there an additional fee for the at-home visit?

We charge $150 per person for an at-home visit. This is not covered by insurance and will be collected when appointment is scheduled. We are committed to caring for all people regardless of their ability to pay. If you have financial concerns please discuss this with Dr. Berchelmann.

Services Offered

  • PCR nasal swab COVID test
  • Covid antibody, antigen, and pcr saliva test
  • Providing Connecticut at home visits in Darien, New Canaan, and Rowayton only at this time.

Licensed States

Connecticut, Texas

Patients I See

Marisa will provide at home visits after an initial virtual office visit with Dr. Berchelmann. Dr. Berchelmann is a board certified pediatrician. She is currently providing COVID screening and testing for patients of all ages.