A subcutaneously implantable device includes a housing, a clip attached to a top side of the housing that is configured to anchor the device to a muscle, a bone, and/or a first tissue, and a first prong with a proximal end attached to the housing and a distal end extending away from the housing that is configured to contact a first lung. A first electrode on the device is configured to contact the first lung, and a second electrode on the device is configured to contact the first lung or a second lung. Sensing circuitry in the housing in electrical communication with the first electrode and the second electrode is configured to measure an impedance in the first lung and/or the second lung, and/or a transthoracic impedance across the first lung and the second lung.