Is N20 a billable ICD-10-CM code?

No. N20 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N20 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Urolithiasis (N20-N23).

What cannot be coded together with N20?

N20 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

N20

N20 — Calculus of kidney and ureter

Non-billable headerICD-10-CM

N20 is a non-billable header ICD-10-CM code for calculus of kidney and ureter. 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.

nephrocalcinosis (E83.59)
that with hydronephrosis (N13.2)

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Calculous pyelonephritis

Other codes that can never be billed with N20

These codes carry an Excludes1 note pointing at N20. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N20 alone.

N11.1Chronic obstructive pyelonephritis
N12Tubulo-interstitial nephritis, not specified as acute or chronic
N21.9Calculus of lower urinary tract, unspecified
E79Disorders of purine and pyrimidine metabolism

Risk adjustment

N20 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 N20

4 child codes. Green means billable.

Questions about N20

Is N20 a billable ICD-10-CM code?: No. N20 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N20 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Urolithiasis (N20-N23).
What cannot be coded together with N20?: N20 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.