2027 ICD-10-CM Diagnosis Code N13.9Obstructive and reflux uropathy, unspecified
ICD-10-CM Codes›N00–N99›N10-N16›N13
- Billable — Valid for Submission
- Not Chronic
N13.9 is a billable ICD-10-CM diagnosis code for obstructive and reflux uropathy, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700, 791, 793. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of kidney and ureters.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired obstruction of urinary tract
- Azotemia
- Complete obstruction of the urinary tract
- Congenital cleft hand
- Lower urinary tract obstructive syndrome
- Nephropathy due to acquired urinary tract obstruction
- Partial obstruction of urinary tract
- Postrenal azotemia
- Reflux of urine
- Split hand, obstructive uropathy, spina bifida, diaphragmatic defect syndrome
- Upper urinary tract dilatation and obstruction
- Urinary outflow obstruction
- Urinary tract obstruction
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to N13.9: its own notes plus those printed at N13, block N10-N16, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Urinary tract obstruction NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- pyeloureteritis cystica (N28.85)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name N13.9, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming N13.9: they are not reported together with it, unless the two conditions are unrelated.
Code Also 3
These codes say N13.9 may also be needed to fully describe the condition. The note gives no sequencing direction.
- N80.A4 Superficial endometriosis of ureterif applicable, obstructive and reflux uropathy (N13.-) names N13.-, which includes this code
- N80.A5 Deep endometriosis of ureterif applicable, obstructive and reflux uropathy (N13.-) names N13.-, which includes this code
- N80.A6 Endometriosis of ureter, unspecified depthif applicable, obstructive and reflux uropathy (N13.-) names N13.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Obstruction, obstructed, obstructive
urinary (moderate) N13.9
organ or tract (lower) N13.9
uropathy N13.9
obstructive N13.9
reflux N13.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Bladder Diseases
The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are:
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert N13.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About N13.9Overview
What is the ICD-10 code for obstructive and reflux uropathy, unspecified?
The ICD-10-CM code for obstructive and reflux uropathy, unspecified is N13.9 (sometimes written as N139). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is N13.9 (Obstructive and reflux uropathy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report obstructive and reflux uropathy, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does N13.9 group to?
When obstructive and reflux uropathy, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 699, 698, 700, with relative weights from 0.6740 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Can N13.9 be reported with N28.85?
Not as a rule. The Excludes1 note at block N10-N16, which applies to N13.9, lists "pyeloureteritis cystica (N28.85)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of N13.9?
Under the General Equivalence Mappings, obstructive and reflux uropathy, unspecified converts to ICD-9-CM 592.9 (urinary calculus NOS), 593.73 (vscourtl rflx w npht NOS), and 599.60 (urinary obstruction NOS). The mapping is approximate, so confirm the match fits the documentation.
