Is N13 a billable ICD-10-CM code?

No. N13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does N13 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Renal tubulo-interstitial diseases (N10-N16).

N13

N13 — Obstructive and reflux uropathy

Non-billable headerICD-10-CM

N13 is a non-billable header ICD-10-CM code for obstructive and reflux uropathy. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 — not included here, but may coexist

The excluded condition is not part of this code, but a patient can have both. You may code both.

calculus of kidney and ureter without hydronephrosis (N20.-)
congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3)
hydronephrosis with ureteropelvic junction obstruction (Q62.11)
obstructive pyelonephritis (N11.1)

Other codes that can never be billed with N13

These codes carry an Excludes1 note pointing at N13. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N13 alone.

M72.8Other fibroblastic disorders
N11.0Nonobstructive reflux-associated chronic pyelonephritis
N11.1Chronic obstructive pyelonephritis
N13.1Hydronephrosis with ureteral stricture, not elsewhere classified
N13.2Hydronephrosis with renal and ureteral calculous obstruction
N13.3Other and unspecified hydronephrosis
N13.4Hydroureter
N13.5Crossing vessel and stricture of ureter without hydronephrosis

Risk adjustment

N13 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 N13

10 child codes. Green means billable.

Questions about N13

Is N13 a billable ICD-10-CM code?: No. N13 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does N13 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Renal tubulo-interstitial diseases (N10-N16).