CMS Pub. 100-04, ch. 12, § 30.6.12.5

Critical care visits may be furnished as split (or shared) visits, defined in section 30.6.18. The

rules described in section 30.6.18 for other types of split (or shared) visits apply (except for the

listing of qualifying activities for determining the substantive portion, discussed below), and

service time is counted for CPT code 99292 in the same way as for prolonged E/M services.

Specifically, the billing practitioner bills the initial service (CPT 99291) and any add-on

codes(s) for additional time (CPT 99292). Also, the substantive portion for critical care

services is defined as more than half of the total time spent by the physician and NPP

beginning January 1, 2022. In the context of critical care, split (or shared) visits occur when

the total critical care service time furnished by a physician and NPP in the same group on a

given calendar date to a patient is summed, and the practitioner who furnishes the substantive

portion of the cumulative critical care time reports the critical care service(s).

As stated earlier, when critical care services are furnished as a split (or shared) visit, the

substantive portion is defined as more than half the cumulative total time in qualifying

activities that are included in CPT codes 99291 and 99292. Since, unlike other types of E/M

visits, critical care services can include additional activities that are bundled into the critical

care visits code(s), there is a unique listing of qualifying activities for split (or shared) critical

care. These qualifying activities are described in the prefatory language for critical care

services in the CPT Codebook.

To bill split (or shared) critical care services, the billing practitioner first reports CPT code

99291 and, if 104 or more cumulative total minutes are spent providing critical care, the billing

practitioner reports one or more units of CPT code 99292. Modifier -FS (split or shared E/M

visit) must be appended to the critical care CPT code(s) on the claim.

The same documentation rules apply for split (or shared) critical care visits as for other types of

split (or shared) E/M visits. Consistent with all split (or shared) visits, when two or more

practitioners spend time jointly meeting with or discussing the patient as part of a critical care

service, the time can be counted only once for purposes of reporting the split (or shared)

critical care visit.