Which CPT code would represent Dr Christian Conover's initial hospital observation service on August 15?

• A. 99222
• B. 99221
• C. 99358
• D. 99223

Answer: (B)

Hospital observation visits use a distinct set of E/M codes from inpatient admissions. For the initial observation encounter, CPT codes range from 99218 to 99220, with 99218 representing the baseline initial observation evaluation, and 99219–99220 reflecting higher complexity or longer time.

The code 99221 is reserved for initial hospital inpatient care (admission as an inpatient), not observation. Without additional detail showing higher complexity, the typical initial observation code would be 99218 (and 99219 or 99220 only if the documentation shows greater complexity or time).

So, for an initial hospital observation service, the correct approach is to use an observation code from 99218–99220 rather than 99221. The other options, such as 99358 (prolonged services) and 99223 (a higher-level inpatient initial encounter), do not represent an initial observation visit.