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N13.0 ICD-10-CM Code: Hydronephrosis with ureteropelvic junction obstruction

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
2 inclusion terms · 1 Excludes1 · 5 Excludes2

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Excludes1Never report with this code
  • pyeloureteritis cystica (N28.85)
Excludes2Not included here; may be reported together
  • Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2)
  • 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)

+1 more in Instructions

IncludesWhat this code covers
  • pyelonephritis
  • Hydronephrosis due to acquired occlusion of ureteropelvic junction

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 693 — URINARY STONES WITH MCC (MDC 11)
  • MS-DRG 694 — URINARY STONES WITHOUT MCC (MDC 11)
  • MS-DRG 791 — PREMATURITY WITH MAJOR PROBLEMS (MDC 15)
  • MS-DRG 793 — FULL TERM NEONATE WITH MAJOR PROBLEMS (MDC 15)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for N13.0 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on N13.0 itself; “inherited from” names the category or block whose note applies here.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • pyelonephritis

Source: inherited from N10-N16

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Hydronephrosis due to acquired occlusion of ureteropelvic junction

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Source: inherited from N10-N16

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Coder workflow for N13.0

MedCoder structured workflow — derived from this code’s own official record

Before you code N13.0

  1. N13.0’s title joins a condition with an associated condition or complication. Confirm each component is documented. Where the classification presumes the link through the “with” convention, only a provider statement that the conditions are unrelated defeats it. A combination code is assigned only when it fully identifies the documented conditions; a required second code for the stage, type or manifestation is still reported when the notes ask for it (Guidelines I.B.9, I.A.15).

    Guide: Combination codes →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with N13.0. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in N13.0’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewN28.85

Consider N13.0. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
The associated condition or complication
Whether the associated condition the title names is documented; the “with” convention presumes some links, and a provider statement that the conditions are unrelated defeats it (Guidelines I.A.15).

Official instructions as workflow

  • Excludes1 — check before selecting N13.0(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with N13.0: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareN28.85

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of N13.0(5 notes)

    Coding workflow: The conditions named in this note are not included in N13.0. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareN13.2, N20, Q62.11, N11.1

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition N13.0 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewN28.85

Documentation: Only one of the components this code’s title joins is documented.

Coding question: Is N13.0 supported?

Path: Review the code for the documented component on its own.

Reason: A combination code is assigned only when it fully identifies the documented conditions; otherwise the documented component takes its own code (Guidelines I.B.9).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse N13.0 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of N13.0 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • N28.85— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of pyeloureteritis cystica moves the case to N28.85; the two are not reported together unless documented as unrelated.

    Full comparison: N13.0 vs N28.85 →

  • N13.3— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Other and unspecified hydronephrosis” takes N13.3; specificity in the record moves it back here.

    Full comparison: N13.0 vs N13.3 →

  • N13.2— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of Hydronephrosis with ureteropelvic junction obstruction due to calculus adds N13.2; it is not part of this code and both may be reported when both are documented.

    Full comparison: N13.0 vs N13.2 →

  • N20— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of calculus of kidney and ureter without hydronephrosis adds N20; it is not part of this code and both may be reported when both are documented.

    Full comparison: N13.0 vs N20 →

  • Q62.0— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of congenital obstructive defects of renal pelvis and ureter adds Q62.0; it is not part of this code and both may be reported when both are documented.

    Full comparison: N13.0 vs Q62.0 →

  • Q62.3— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of congenital obstructive defects of renal pelvis and ureter adds Q62.3; it is not part of this code and both may be reported when both are documented.

    Full comparison: N13.0 vs Q62.3 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Hydronephrosis with ureteropelvic junction obstruction is a billable ICD-10-CM diagnosis code (N13.0).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name N13.0 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: N11.1 — Chronic obstructive pyelonephritis (via N13.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 3 Code Also instructions: N80.A4 — Superficial endometriosis of ureter (via N13.-), N80.A5 — Deep endometriosis of ureter (via N13.-), N80.A6 — Endometriosis of ureter, unspecified depth (via N13.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 226 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 4 MS-DRGs: DRG 693 (MDC 11), DRG 694 (MDC 11), DRG 791 (MDC 15), DRG 793 (MDC 15).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):GEN006 — Other specified and unspecified diseases of kidney and ureters (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

N07.6 — Hereditary nephropathy, not elsewhere classified with dense deposit disease, N07.7 — Hereditary nephropathy, not elsewhere classified with diffuse crescentic glomerulonephritis, N07.8 — Hereditary nephropathy, not elsewhere classified with other morphologic lesions, N07.9 — Hereditary nephropathy, not elsewhere classified with unspecified morphologic lesions, N07.B — Hereditary nephropathy, not elsewhere classified with APOL1-mediated kidney disease [AMKD], N10 — Acute pyelonephritis, N11.0 — Nonobstructive reflux-associated chronic pyelonephritis, N11.8 — Other chronic tubulo-interstitial nephritis, N11.9 — Chronic tubulo-interstitial nephritis, unspecified, N12 — Tubulo-interstitial nephritis, not specified as acute or chronic, N13.1 — Hydronephrosis with ureteral stricture, not elsewhere classified, N13.2 — Hydronephrosis with renal and ureteral calculous obstruction, N13.30 — Unspecified hydronephrosis, N13.39 — Other hydronephrosis, N13.6 — Pyonephrosis, N14.0 — Analgesic nephropathy, N14.11 — Contrast-induced nephropathy, N14.19 — Nephropathy induced by other drugs, medicaments and biological substances, N14.2 — Nephropathy induced by unspecified drug, medicament or biological substance, N14.3 — Nephropathy induced by heavy metals, +205 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified and unspecified diseases of kidney and ureters).

A18.11 — Tuberculosis of kidney and ureter, A54.21 — Gonococcal infection of kidney and ureter, N13.1 — Hydronephrosis with ureteral stricture, not elsewhere classified, N13.2 — Hydronephrosis with renal and ureteral calculous obstruction, N13.30 — Unspecified hydronephrosis, N13.39 — Other hydronephrosis, N13.4 — Hydroureter, N13.5 — Crossing vessel and stricture of ureter without hydronephrosis, N13.8 — Other obstructive and reflux uropathy, N13.9 — Obstructive and reflux uropathy, unspecified, N23 — Unspecified renal colic, N25.0 — Renal osteodystrophy, N25.1 — Nephrogenic diabetes insipidus, N25.81 — Secondary hyperparathyroidism of renal origin, N25.89 — Other disorders resulting from impaired renal tubular function, N25.9 — Disorder resulting from impaired renal tubular function, unspecified, N26.1 — Atrophy of kidney (terminal), N26.2 — Page kidney, N27.0 — Small kidney, unilateral, N27.1 — Small kidney, bilateral, +16 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Obstruction, obstructed, obstructive”, “Stricture”; these codes share that main term but sit in a different category of the Tabular List.

K86.89 — Other specified diseases of pancreas (pancreatic duct), K90.2 — Blind loop syndrome, not elsewhere classified (lacteal, with steatorrhea), K91.30 — Postprocedural intestinal obstruction, unspecified as to partial versus complete (intestine, postoperative), K91.31 — Postprocedural partial intestinal obstruction (intestine, postoperative, partial), K91.32 — Postprocedural complete intestinal obstruction (intestine, postoperative, complete), K91.89 — Other postprocedural complications and disorders of digestive system (bile duct, postoperative), K94.03 — Colostomy malfunction (colostomy), K94.13 — Enterostomy malfunction (enterostomy), K94.23 — Gastrostomy malfunction (stoma, gastrostomy), N11.1 — Chronic obstructive pyelonephritis (ureter, with, pyelonephritis), N28.0 — Ischemia and infarction of kidney (artery, renal), N28.89 — Other specified disorders of kidney and ureter (renal), N32.0 — Bladder-neck obstruction (bladder, neck), N32.89 — Other specified disorders of bladder (bladder), N35.010 — Post-traumatic urethral stricture, male, meatal (urethra, post-traumatic, male, meatal), N35.011 — Post-traumatic bulbous urethral stricture (urethra, post-traumatic, male, bulbous urethra), N35.012 — Post-traumatic membranous urethral stricture (urethra, post-traumatic, male, membranous urethra), N35.013 — Post-traumatic anterior urethral stricture (urethra, post-traumatic, male, anterior urethra), N35.014 — Post-traumatic urethral stricture, male, unspecified (urethra, post-traumatic, male), N35.016 — Post-traumatic urethral stricture, male, overlapping sites (urethra, post-traumatic, male, overlapping sites), +211 more

Contextual Map

Every relationship of N13.0 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run N13.0 with these 5 related codes in Claim Check

Hierarchy

Excludes2

Referenced by Excludes1 notes

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 11 — Diseases and Disorders of the Kidney and Urinary Tract[MDC crossing]: “Diseases and Disorders of the Kidney and Urinary Tract — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 3,578 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027
  • MDC 15 — Newborns and Other Neonates with Conditions Originating in Perinatal Period[MDC crossing]: “Newborns and Other Neonates with Conditions Originating in Perinatal Period — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Hydronephrosis NEC (atrophic) (early) (functionless) (intermittent) (primary) (secondary), congenital, due to acquired occlusion of ureteropelvic junction[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Hydronephrosis NEC (atrophic) (early) (functionless) (intermittent) (primary) (secondary), with, obstruction (by) (of), ureteropelvic junction (congenital), acquired[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Obstruction, obstructed, obstructive, pelviureteral junction, with hydronephrosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Stricture, pelviureteric junction (congenital), acquired, with hydronephrosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Stricture, ureteropelvic junction (congenital), acquired, with hydronephrosis[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (22)

Change history

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (5)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "N13.0 — Hydronephrosis with ureteropelvic junction obstruction." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/n13.0-hydronephrosis-with-ureteropelvic-junction-obstruction

Change history

  • FY2017 — October 1, 2016
    Added to the code set
    Hydronephrosis with ureteropelvic junction obstruction
    FY2017 changes

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N13.0 in its code family, with their registry titles.

View all codes in the N13 family