Dig the Diurnal Curve Testing Code Out of the CPT® Code Book
Question: Our ophthalmologist evaluated intraocular pressures (IOPs) over 12 hours and documented the measurements. The provider described the procedure as “diurnal curve testing,” but I’m not sure what that means. What code should I use to report diurnal curve testing? Kansas Subscriber Answer: Assign 92100 (Serial tonometry (separate procedure) with multiple measurements of intraocular pressure over an extended time period with interpretation and report, same day (eg, diurnal curve or medical treatment of acute elevation of intraocular pressure)) to report diurnal curve testing. Double-check the documentation to review how many measurements were captured during the 12 hours. Most Medicare carriers require that three tests be performed over six or more hours before it can be considered serial tonometry. Watch out: While your case occurred over 12 hours, beware of the reports that mention the provider performed tonometry once or twice during an eye exam. You cannot report 92100 in that situation because Medicare and CPT® consider tonometry part of intermediate or comprehensive ophthalmological services for new or established patients or evaluation and management (E/M) services. Report only once: The ophthalmologist may need only one day to capture the serial tonometry measurements or the testing could happen over several days. Either way, you’ll report 92100 only once for the service. Additionally, the code represents a bilateral service, which means you’ll report 92100 once regardless of whether one or both eyes are evaluated. Mike Shaughnessy, BA, CPC, Production Editor, AAPC
