Is G21.9 a billable code?
Yes. G21.9 is a billable ICD-10-CM code and can be used on claims and superbills for dates of service from October 1, 2026 to September 30, 2027.
ICD-10-CM FY2027 diagnosis code
G21.9: Secondary parkinsonism, unspecified
Billable codeValid for dates of service October 1, 2026 to September 30, 2027
G21.9 is a billable ICD-10-CM diagnosis code for secondary parkinsonism, unspecified. It is specific enough to use on an insurance claim, a superbill or a Good Faith Estimate.
Superbill GeneratorStart a superbill with G21.9 already added.Good Faith EstimateStart a cost estimate with G21.9 already added.CMS-1500 Claim FormFill a claim form with G21.9 in box 21.
G21.9 questions
What does G21.9 mean?
G21.9 is the ICD-10-CM code for Secondary parkinsonism, unspecified. It is in chapter 6, Diseases of the nervous system (G00-G99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.