FY2027 ICD-10-CM reference
N13.1: Hydronephrosis with ureteral stricture, not elsewhere classified
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Hydronephrosis with ureteral stricture, not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: N00-N99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: N00-N99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: N00-N99 (chapter, inherited).
Excludes2
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
Source: N00-N99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: N00-N99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: N00-N99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: N00-N99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: N00-N99 (chapter, inherited).
Includes
pyelonephritis
Source: N10-N16 (section, inherited).
Excludes1
pyeloureteritis cystica (N28.85)
Source: N10-N16 (section, inherited).
Excludes2
calculus of kidney and ureter without hydronephrosis (N20.-)
Source: N13 (category, inherited).
Excludes2
congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3)
Source: N13 (category, inherited).
Excludes2
hydronephrosis with ureteropelvic junction obstruction (Q62.11)
Source: N13 (category, inherited).
Excludes2
obstructive pyelonephritis (N11.1)
Source: N13 (category, inherited).
Excludes1
Hydronephrosis with ureteral stricture with infection (N13.6)
Source: N13.1 (self, direct).
Compare the FY2027 additions, removals and billable-status changes
What does N13.1 mean in FY2027?
The official ICD-10-CM descriptor is Hydronephrosis with ureteral stricture, not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is N13.1 billable in FY2027?
The FY2027 order file marks N13.1 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does N13.1 map to an HCC?
N13.1 has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). ESRD and RxHCC mappings are still pending verification for FY2027. CMS-HCC V24, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition