ICD-10 code for miliary tuberculosis

The ICD-10-CM code for miliary tuberculosis is A19.9 (Miliary tuberculosis, unspecified). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on A19.9.

Within A19, choose A19.9 (unspecified) only when documentation doesn't support a more specific option: acute miliary tuberculosis of a single specified site (A19.0), acute miliary tuberculosis of multiple sites (A19.1), acute miliary tuberculosis, unspecified (A19.2) and other miliary tuberculosis (A19.8).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 867 (Other Infectious and Parasitic Diseases Diagnoses with MCC, relative weight 2.1859), DRG 868 (Other Infectious and Parasitic Diseases Diagnoses with CC, relative weight 1.0235), DRG 869 (Other Infectious and Parasitic Diseases Diagnoses without CC/MCC, relative weight 0.6787), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506), DRG 975 (HIV with Major Related Condition with CC, relative weight 1.3252) and DRG 976 (HIV with Major Related Condition without CC/MCC, relative weight 0.8124), in MDC 18 (Infectious and Parasitic Diseases, Systemic or Unspecified Sites) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.