ICD-10-CM 2027
ICD-10 code for hydronephrosis NEC
From the official ICD-10-CM alphabetic index entry “Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC”. Page updated September 29, 2026.
About coding hydronephrosis NEC
The ICD-10-CM code for hydronephrosis NEC is N13.30 (Unspecified hydronephrosis). The official index lists 16 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on N13.30.
Within N13.3, choose N13.30 (Unspecified hydronephrosis) only when documentation doesn't support a more specific option: other hydronephrosis (N13.39).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 693 (Urinary Stones with MCC, relative weight 1.3168), DRG 694 (Urinary Stones without MCC, relative weight 0.7815), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 11 (Diseases and Disorders of the Kidney and Urinary Tract) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific hydronephrosis NEC codes (official index)
- with
- infection N13.6 — Pyonephrosis
- obstruction (by) (of)
- renal calculus N13.2 — Hydronephrosis with renal and ureteral calculous obstruction
- with infection N13.6 — Pyonephrosis
- ureteral NEC N13.1 — Hydronephrosis with ureteral stricture, not elsewhere classified
- with infection N13.6 — Pyonephrosis
- calculus N13.2 — Hydronephrosis with renal and ureteral calculous obstruction
- with infection N13.6 — Pyonephrosis
- ureteropelvic junction (congenital) Q62.11 — Congenital occlusion of ureteropelvic junction
- acquired N13.0 — Hydronephrosis with ureteropelvic junction obstruction
- with infection N13.6 — Pyonephrosis
- ureteral stricture NEC N13.1 — Hydronephrosis with ureteral stricture, not elsewhere classified
- with infection N13.6 — Pyonephrosis
- congenital Q62.0 — Congenital hydronephrosis
- due to acquired occlusion of ureteropelvic junction N13.0 — Hydronephrosis with ureteropelvic junction obstruction
- specified type NEC N13.39 — Other hydronephrosis
- tuberculous A18.11 — Tuberculosis of kidney and ureter
Common questions about hydronephrosis NEC ICD-10 codes
What is the ICD-10 code for hydronephrosis NEC?
- N13.30 — Unspecified hydronephrosis. More specific codes apply when the documentation supports them: N13.6, N13.2, N13.6, N13.1 and others below.
What is the ICD-10 code for congenital hydronephrosis nec?
- Q62.0 — Congenital hydronephrosis.
What is the ICD-10 code for tuberculous hydronephrosis nec?
- A18.11 — Tuberculosis of kidney and ureter.
Is N13.30 billable?
- Yes. N13.30 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can N13.30 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict N13.30 as a principal diagnosis.
Is N13.30 a CC or MCC?
- N13.30 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.