Is N26 a billable ICD-10-CM code?

No. N26 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N26 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Other disorders of kidney and ureter (N25-N29).

What cannot be coded together with N26?

N26 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

N26

N26 — Unspecified contracted kidney

Non-billable headerICD-10-CMunspecified

N26 is a non-billable header ICD-10-CM code for unspecified contracted kidney. 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.

contracted kidney due to hypertension (I12.-)
diffuse sclerosing glomerulonephritis (N05.8.-)
hypertensive nephrosclerosis (arteriolar) (arteriosclerotic) (I12.-)
small kidney of unknown cause (N27.-)

Risk adjustment

N26 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 N26

3 child codes. Green means billable.

Questions about N26

Is N26 a billable ICD-10-CM code?: No. N26 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N26 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Other disorders of kidney and ureter (N25-N29).
What cannot be coded together with N26?: N26 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.