A19.9 ICD-10-CM Code: Miliary tuberculosis, unspecified

A19.9 is the ICD-10-CM diagnosis code for miliary tuberculosis, unspecified. Miliary tuberculosis is a severe form of tuberculosis where the infection spreads throughout the body via the bloodstream, creating tiny lesions that resemble millet seeds (hence the name). The 'unspecified' designation means the exact site or organs affected have not been documented. A19.9 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering tuberculosis (a15-a19).

A19.9 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Miliary TB is a serious disseminated form of tuberculosis; verify documentation specifies miliary pattern before coding this diagnosis, as it carries different clinical implications than localized TB.