D89.9

D89.9: Disorder involving the immune mechanism, unspecified

Billable / specific codeICD-10-CM

D89.9 is a billable, specific ICD-10-CM code for disorder involving the immune mechanism, unspecified. It is valid for submission on a claim.

Check D89.9 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Immune disease NOS

Excludes1 inherited from the categories above D89.9

A category’s note binds every code beneath it.

Written on D89: Other disorders involving the immune mechanism, not elsewhere classified

hyperglobulinemia NOS (R77.1)
monoclonal gammopathy (of undetermined significance) (D47.2)

Excludes2 inherited from the categories above D89.9

Not part of this code, but both may be coded when both are present.

Written on D89: Other disorders involving the immune mechanism, not elsewhere classified

transplant failure and rejection (T86.-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

D89.9 is named in 5 Medicare coverage policies: 5 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
A56464Billing and Coding: Flow Cytometry
A56718Billing and Coding: Intravenous Immunoglobulin (IVIG)

Alphabetic index entries that lead here

Disease, diseased›immune
Disorder›immune mechanism(immunity)

Code history

Unchanged in every release from FY2024 to FY2027.