Is D89.89 a billable ICD-10-CM code?

Yes. D89.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does D89.89 sit in the tabular list?

Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Certain disorders involving the immune mechanism (D80-D89).

What cannot be coded together with D89.89?

D89.89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

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.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

human immunodeficiency virus disease (B20)

Risk adjustment

D89.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

D89.89 is named in 24 Medicare coverage policies — 24 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52450Billing and Coding: Paclitaxel (e.g., Taxol®/Abraxane ™)
A55717Billing and Coding: Lab: Flow Cytometry
A56380Billing and Coding: Rituximab
A56464Billing and Coding: Flow Cytometry

How D89.89 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to D89.89.

PANDAS(pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections syndrome)
Disorder›autoimmune
Syndrome›pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections(PANDAS)
Disorder›immune mechanism›specified type NEC

Related codes at this level

Codes that share D89.8. If D89.89 is not quite right, the correct code is usually one of these.

Questions about D89.89

Is D89.89 a billable ICD-10-CM code?: Yes. D89.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does D89.89 sit in the tabular list?: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89), in the block Certain disorders involving the immune mechanism (D80-D89).
What cannot be coded together with D89.89?: D89.89 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.