G40-G47 — Episodic and paroxysmal disorders
ICD-10-CM codes G40-G47 cover episodic and paroxysmal disorders, within diseases of the nervous system. The block holds 307 codes across 6 categories, of which 205 are billable and 102 are header codes that cannot be submitted on a claim.
Risk adjustment in G40-G47
0 codes in this block map to a CMS-HCC, which means the diagnosis carries a risk-adjustment payment when it is documented and coded. Under-coding here is money left on the table; over-coding here is what audits are for.
- HCC 201 Seizure Disorders and Convulsions
What else to watch in G40-G47
- 203 codes are named in Medicare coverage policies. An LCD or NCD lists them as supporting medical necessity, or explicitly as not supporting it. Which applies depends on the MAC for your state.