Is N01 a billable ICD-10-CM code?

No. N01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N01 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Glomerular diseases (N00-N08).

What cannot be coded together with N01?

N01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

N01

N01 — Rapidly progressive nephritic syndrome

Non-billable headerICD-10-CM

N01 is a non-billable header ICD-10-CM code for rapidly progressive nephritic syndrome. 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.

nephritic syndrome NOS (N05.-)

Includes

Conditions this code covers.

rapidly progressive glomerular disease
rapidly progressive glomerulonephritis
rapidly progressive nephritis

Other codes that can never be billed with N01

These codes carry an Excludes1 note pointing at N01. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N01 alone.

N01.5Rapidly progressive nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
N01.ARapidly progressive nephritic syndrome with C3 glomerulonephritis

Risk adjustment

N01 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 N01

11 child codes. Green means billable.

Questions about N01

Is N01 a billable ICD-10-CM code?: No. N01 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N01 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Glomerular diseases (N00-N08).
What cannot be coded together with N01?: N01 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.