D89.89
D89.89: Other specified disorders involving the immune mechanism, not elsewhere classified
Billable / specific codeICD-10-CM
D89.89 is a billable, specific ICD-10-CM code for other specified disorders involving the immune mechanism, not elsewhere classified. It is valid for submission on a claim.
Check D89.89 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- human immunodeficiency virus disease (B20)
Excludes1 inherited from the categories above D89.89
A category’s note binds every code beneath it.
Excludes2 inherited from the categories above D89.89
Not part of this code, but both may be coded when both are present.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
D89.89 is named in 19 Medicare coverage policies: 19 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A52450Billing and Coding: Paclitaxel (e.g., Taxol®/Abraxane ™)
- A55717Billing and Coding: Lab: Flow Cytometry
- A56380Billing and Coding: Rituximab
- A56464Billing and Coding: Flow Cytometry
Alphabetic index entries that lead here
- PANDAS(pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections syndrome)
- PANS(Pediatric Acute-onset Neuropsychiatric Syndrome)
- Disorder›autoimmune
- Syndrome›pediatric acute-onset neuropsychiatric(PANS)
- Syndrome›pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections(PANDAS)
- Disorder›immune mechanism›specified type NEC
Code history
Unchanged in every release from FY2024 to FY2027.