Is A40 a billable ICD-10-CM code?

No. A40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does A40 sit in the tabular list?

Certain infectious and parasitic diseases (A00-B99), in the block Other bacterial diseases (A30-A49).

What cannot be coded together with A40?

A40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

A40

A40 — Streptococcal sepsis

Non-billable headerICD-10-CM

A40 is a non-billable header ICD-10-CM code for streptococcal sepsis. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 — never code together

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

neonatal (P36.0-P36.1)
puerperal sepsis (O85)
sepsis due to Streptococcus, group D (A41.81)

Code first

The underlying condition must be sequenced before this code.

, if applicable, postprocedural sepsis (T81.44-)
sepsis due to central venous catheter (T80.211-)
streptococcal sepsis during labor (O75.3)
streptococcal sepsis following abortion or ectopic or molar pregnancy (O03.37, O03.87, O04.87, O07.37, O08.82)
streptococcal sepsis following immunization (T88.0-)
streptococcal sepsis following infusion, transfusion or therapeutic injection (T80.22-, T80.29-)

Other codes that can never be billed with A40

These codes carry an Excludes1 note pointing at A40. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading A40 alone.

A41Other sepsis

Risk adjustment

A40 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.

Code to one of these instead A40

5 child codes. Green means billable.

Questions about A40

Is A40 a billable ICD-10-CM code?: No. A40 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does A40 sit in the tabular list?: Certain infectious and parasitic diseases (A00-B99), in the block Other bacterial diseases (A30-A49).
What cannot be coded together with A40?: A40 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.