ICD-10-PCS code 00990ZZ for Drainage of Thalamus, Open Approach is a medical classification as listed by CMS under Central Nervous System and Cranial Nerves range.
No need to flip from a code to the front of a book or to hunt through online PDFs to locate applicable chapter and block specific guidelines. See essential instructions from ICD-10-PCS Official Guidelines for Coding and Reporting right on your code details page.