R89.5 vs Z22
R89.5 and Z22 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
Abnormal microbiological findings in specimens from other organs, systems and tissues
- Chapter 18
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
- Section
- R83-R89
- Positive culture findings in specimens from other organs, systems and tissues
- Positive › culture › nipple discharge
- Positive › culture › synovial fluid
- Positive › culture › wound secretions
- Abnormal, abnormality, abnormalities › specimen › specified organ, system and tissue NOS › microbiology
Carrier of infectious disease
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z20-Z29
- colonization status
- suspected carrier
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027