Is A90 a billable ICD-10-CM code?

Yes. A90 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does A90 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99).

What cannot be coded together with A90?

A90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

A90

A90 — Dengue fever [classical dengue]

Billable / specific codeICD-10-CM

A90 is a billable, specific ICD-10-CM code for dengue fever [classical dengue]. 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.

dengue hemorrhagic fever (A91)

Risk adjustment

A90 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.

How A90 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 A90.

Dengue(classical) (fever)
Fever›Aden(dengue)
Fever›breakbone
Fever›dandy
Fever›dengue(virus)
Fever›solar
Fever›sun
Fever›seven day›dengue

Questions about A90

Is A90 a billable ICD-10-CM code?: Yes. A90 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does A90 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99).
What cannot be coded together with A90?: A90 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.