Is N31 a billable ICD-10-CM code?

No. N31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N31 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Other diseases of the urinary system (N30-N39).

What cannot be coded together with N31?

N31 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.

N31

N31 — Neuromuscular dysfunction of bladder, not elsewhere classified

Non-billable headerICD-10-CM

N31 is a non-billable header ICD-10-CM code for neuromuscular dysfunction of bladder, not elsewhere classified. 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.

cord bladder NOS (G95.89)
neurogenic bladder due to cauda equina syndrome (G83.4)
neuromuscular dysfunction due to spinal cord lesion (G95.89)

Use additional code

Add a secondary code to capture the detail described below.

code to identify any associated urinary incontinence (N39.3-N39.4-)

Other codes that can never be billed with N31

These codes carry an Excludes1 note pointing at N31. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N31 alone.

G83.4Cauda equina syndrome
G95.8Other specified diseases of spinal cord
N33Bladder disorders in diseases classified elsewhere

Risk adjustment

N31 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 history

N31 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead N31

5 child codes. Green means billable.

Questions about N31

Is N31 a billable ICD-10-CM code?: No. N31 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N31 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Other diseases of the urinary system (N30-N39).
What cannot be coded together with N31?: N31 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter.