N13.6 — Pyonephrosis

BillableCC

Is N13.6 billable?

Yes — N13.6 is billable for FY2027. N13.6 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. N13.6 may be submitted for encounters from October 1, 2026 through September 30, 2027.

N13.6 at a glance

Code	N13.6
Description	Pyonephrosis
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

Which MS-DRGs does N13.6 group to?

N13.6 sits in MDC 11 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

689Kidney and Urinary Tract Infections with MCCmedical
690Kidney and Urinary Tract Infections without MCCmedical

As a secondary diagnosis, N13.6 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG. It also carries Hospital-Acquired Condition category 06.

How is N13.6 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to N13.6. They show the wording a clinician may have documented, which often differs from the Tabular description.

Hydropyonephrosis
Pyohydronephrosis
Pyonephrosis
Hydroureter › with infection
Ormond's disease › with infection (with ureteral obstruction)
Angulation › ureter › with infection
Calculus, calculi, calculous › pyelitis › with hydronephrosis
Calculus, calculi, calculous › pyelonephritis › with hydronephrosis
Constriction › ureter › with infection
Contraction, contracture, contracted › ureterovesical orifice › with infection (s)
Fasciitis › perirenal › with infection
Fibrosis, fibrotic › retroperitoneal › with infection

Use additional code

Report an additional code alongside N13.6 to fully describe the condition. N13.6 is sequenced first.

code (B95-B97), to identify infectious agent.

Inclusion terms

Alternative wording in documentation that is classified to N13.6.

Conditions in N13.0-N13.5 with infection
Obstructive uropathy with infection

Excludes1 — never code together — inherited from N10-N16

The conditions below can never be reported together with N13.6 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

pyeloureteritis cystica (N28.85)

Excludes2 — not included here — inherited from Chapter 14

The conditions below are not part of N13.6, but a patient may have both at the same time. When documentation supports it, N13.6 and the excluded code may both be reported.

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Excludes2 — not included here — inherited from N13

The conditions below are not part of N13.6, but a patient may have both at the same time. When documentation supports it, N13.6 and the excluded code may both be reported.

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)

How long has N13.6 existed?

N13.6 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with N13.6?

ICD-10-CM declares these codes mutually exclusive with N13.6 — exactly one of each pair can be correct for a given encounter.