Is M31.1 a billable ICD-10-CM code?

No. M31.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does M31.1 sit in the tabular list?

Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Systemic connective tissue disorders (M30-M36).

M31.1

M31.1 — Thrombotic microangiopathy

Non-billable headerICD-10-CM

M31.1 is a non-billable header ICD-10-CM code for thrombotic microangiopathy. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with M31.1

These codes carry an Excludes1 note pointing at M31.1. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading M31.1 alone.

D69Purpura and other hemorrhagic conditions
D68.5Primary thrombophilia

Risk adjustment

M31.1 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 M31.1

3 child codes. Green means billable.

Related codes at this level

Codes that share M31. If M31.1 is not quite right, the correct code is usually one of these.

Questions about M31.1

Is M31.1 a billable ICD-10-CM code?: No. M31.1 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does M31.1 sit in the tabular list?: Diseases of the musculoskeletal system and connective tissue (M00-M99), in the block Systemic connective tissue disorders (M30-M36).