N17.9 ICD-10-CM Code: Acute kidney failure, unspecified

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for N17.9 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on N17.9 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for N17.9

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

Before you code N17.9

1. Unspecified does not mean incorrect. When the record gives no greater specificity, N17.9 may be the appropriate code. Check the record for detail that supports a more specific sibling — in this subcategory the siblings differ by acute versus chronic, the presence or absence of the associated condition. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

   ReviewN17.0, N17.1, N17.2, N17.8

   See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with N17.9. 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 record document the detail a more specific sibling code needs?
   Yes → Review the specific siblings in this subcategory.
   No → Continue — N17.9 is appropriate when the documentation goes no further.

   ReviewN17.0, N17.1, N17.2, N17.8

2. Does the documentation support a condition named in N17.9’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.

   ReviewT79.5

Consider N17.9. Then review the Code Also note, and 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).

Acuity

Acute or chronic as documented; when both are documented and separate codes exist, both are reported with the acute code first (Guidelines I.B.8).

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).

Any detail beyond this code’s title

What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

• Excludes1 — check before selecting N17.9(1 note)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with N17.9: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareT79.5

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

• Excludes2 — not part of N17.9(11 notes)

  Coding workflow: The conditions named in this note are not included in N17.9. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareS37.0, P96.0, N14, R39.2, D59.3, K76.7

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

• Code Also — related condition(1 note)

  Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

  See the official tabular notes · Guidelines I.A.17

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.

Indexed Clinical Terms (3)

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.

• Failure, failed, renal, acute
• Injury, kidney, acute (nontraumatic)
• Necrosis, necrotic (ischemic), kidney (bilateral), acute

Coding Notes

MedCoder editorial — not official ICD-10-CM text; reviewed against the cited source

What this code means

N17.9 reports acute kidney failure with no documented lesion type, and it is where “acute kidney injury” lands — “Acute kidney injury (nontraumatic)” is the code’s own inclusion term. The N17 rows above it (N17.0 tubular necrosis, N17.1 cortical necrosis, N17.2 medullary necrosis) claim records that name the lesion.

Coding guidance

• When the provider documents acute kidney injury and no more specific acute kidney-failure type (or an applicable alternative pathway) is documented, N17.9 is the usual coding pathway — the specific N17 rows require a named pathology, not a severity stage.
• The trauma boundary runs through two notes: posttraumatic renal failure is an Excludes1 (T79.5), and traumatic kidney injury an Excludes2 (S37.0-). A documented traumatic mechanism leaves this code entirely.
• Acute-on-chronic kidney disease takes two codes: N17.9 for the acute failure and the N18 stage code for the chronic disease — no Excludes note bars the pair.
• The code carries a Code Also note for the associated underlying condition, when documented.

Decision-rule scenarios

Scenarios state the decision rule, not a code assignment — code selection always follows the provider's documentation and the ICD-10-CM Official Guidelines.

Documentation checklist

• The acuity — that the failure or injury is acute, not a chronic stage.
• Any named lesion (tubular, cortical, medullary necrosis), which selects a specific N17 row.
• A traumatic mechanism, which moves the record out of N17 altogether.
• The underlying condition, for the Code Also note, and any coexisting CKD stage.

Codes are assigned from provider documentation; a coder never infers a diagnosis.

Common mistakes

• Coding “AKI” to an injury chapter code — nontraumatic acute kidney injury is N17.9’s own inclusion term.
• Dropping the N18 stage when AKI arrives on top of documented CKD — both are reported.
• Using N17.9 for a documented posttraumatic renal failure, which the Excludes1 routes to T79.5.

Clinical context (coding perspective)

“AKI” replaced “acute renal failure” in clinical writing years ago, and the classification followed by adding the inclusion term rather than a new code — which is why the abbreviation maps cleanly here despite the code title still reading “acute kidney failure.”

Written and reviewed by MedCoder against the official ICD-10-CM files; educational, not medical or billing advice. The official tabular notes and guidelines above take precedence in every case.

Don’t confuse N17.9 with…

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

The codes most likely to be picked instead of N17.9 — 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.

• T79.5— 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 posttraumatic renal failure moves the case to T79.5; the two are not reported together unless documented as unrelated.

  Full comparison: N17.9 vs T79.5 →

• S37.0— 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 traumatic kidney injury adds S37.0; it is not part of this code and both may be reported when both are documented.

  Full comparison: N17.9 vs S37.0 →

• P96.0— 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 renal failure adds P96.0; it is not part of this code and both may be reported when both are documented.

  Full comparison: N17.9 vs P96.0 →

• N14— 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 drug- and heavy-metal-induced tubulo-interstitial and tubular conditions adds N14; it is not part of this code and both may be reported when both are documented.

  Full comparison: N17.9 vs N14 →

• R39.2— 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 extrarenal uremia adds R39.2; it is not part of this code and both may be reported when both are documented.

  Full comparison: N17.9 vs R39.2 →

• D59.3— 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 hemolytic-uremic syndrome adds D59.3; it is not part of this code and both may be reported when both are documented.

  Full comparison: N17.9 vs D59.3 →

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.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

1. 1 Code Also note — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
2. 1 Excludes1 entry — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes
3. 11 Excludes2 entries — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

• CC as a secondary diagnosis (FY2026). 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 structured relationships — computed from published CMS and AHRQ datasets

Other codes that name N17.9 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: N19 — Unspecified kidney failure (via N17.-).

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

Referenced by 3 Excludes2 notes across 3 chapters: I12 — Hypertensive chronic kidney disease (via N17.-), N14.11 — Contrast-induced nephropathy (via N17.-), S37.0 — Injury of kidney.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Code First instruction: I5A — Non-ischemic myocardial injury (non-traumatic) (via N17.-).

Each of these codes carries a Code First note naming this condition — when that code is reported, THIS code is sequenced first, ahead of it.

Referenced by 5 Use Additional Code instructions across 4 chapters: B33.4 — Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS], I75.81 — Atheroembolism of kidney (via N17.-), M31.11 — Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA] (via N17.-), R65.11 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction (via N17.-), R65.2 — Severe sepsis (via N17.-).

These codes instruct coders to additionally report this code when it applies.

Referenced by 13 Code Also instructions across 4 chapters: D59.3 — Hemolytic-uremic syndrome (via N17.-), I16.1 — Hypertensive emergency (via N17.-), M35.81 — Multisystem inflammatory syndrome (via N17.-), N00 — Acute nephritic syndrome (via N17.-), N00-N08 — Glomerular diseases (N00-N08) (via N17.-), N01 — Rapidly progressive nephritic syndrome (via N17.-), N02 — Recurrent and persistent hematuria (via N17.-), N03 — Chronic nephritic syndrome (via N17.-), N04 — Nephrotic syndrome (via N17.-), N05 — Unspecified nephritic syndrome (via N17.-), N06 — Isolated proteinuria with specified morphological lesion (via N17.-), N07 — Hereditary nephropathy, not elsewhere classified (via N17.-), N08 — Glomerular disorders in diseases classified elsewhere (via N17.-).

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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 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 301 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 8 MS-DRGs: DRG 673 (MDC 11), DRG 674 (MDC 11), DRG 675 (MDC 11), DRG 682 (MDC 11), DRG 683 (MDC 11), DRG 684 (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):GEN002 — Acute and unspecified renal failure (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 category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Acute and unspecified renal failure).

K76.7 — Hepatorenal syndrome, K91.83 — Postprocedural hepatorenal syndrome, N17.0 — Acute kidney failure with tubular necrosis, N17.1 — Acute kidney failure with acute cortical necrosis, N17.2 — Acute kidney failure with medullary necrosis, N17.8 — Other acute kidney failure, N19 — Unspecified kidney failure, N99.0 — Postprocedural (acute) (chronic) kidney failure, O90.4 — Postpartum acute kidney failure, O90.41 — Hepatorenal syndrome following labor and delivery, O90.49 — Other postpartum acute kidney failure

Same Index main term, other category

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

K86.89 — Other specified diseases of pancreas (pancreas), K90.83 — Intestinal failure (intestinal), K91.82 — Postprocedural hepatic failure (hepatic, postprocedural), M27.2 — Inflammatory conditions of jaws (jaw), M27.61 — Osseointegration failure of dental implant (dental implant, pre-integration), M27.62 — Post-osseointegration biological failure of dental implant (dental implant, due to, occlusal trauma), M27.63 — Post-osseointegration mechanical failure of dental implant (dental implant, post-osseointegration, mechanical), M27.69 — Other endosseous dental implant failure (dental implant), M87.00 — Idiopathic aseptic necrosis of unspecified bone (bone, aseptic or avascular, idiopathic), M87.9 — Osteonecrosis, unspecified (bone), N18.6 — End stage renal disease (renal, end stage), N18.9 — Chronic kidney disease, unspecified (renal, chronic), N19 — Unspecified kidney failure (renal), N28.0 — Ischemia and infarction of kidney (kidney), N32.89 — Other specified disorders of bladder (bladder), N50.89 — Other specified disorders of the male genital organs (testis), N52.9 — Male erectile dysfunction, unspecified (erection), N64.1 — Fat necrosis of breast (breast), N70.92 — Oophoritis, unspecified (ovary), N89.8 — Other specified noninflammatory disorders of vagina (vagina), +175 more

Lab tests where this diagnosis supports Medicare coverage (NCD)

Medicare's National Coverage Determination (NCD) program lists this diagnosis as medical justification for these lab tests.

Gamma-glutamyl Transferase (GGT) Test, HIV Screening Test, Partial Thromboplastin Time (PTT) Test, Prothrombin Time Test and INR (PT/INR)

Contextual Map

Every relationship of N17.9 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 N17.9 with these 18 related codes in Claim Check

Hierarchy

• N00-N99 — Chapter 14: Diseases of the Genitourinary System (N00-N99) (N00-N99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• N17-N19 — Acute kidney failure and chronic kidney disease[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Excludes2

• S37.0 — Injury of kidney[Excludes2]: “traumatic kidney injury (S37.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes1 notes

• N19 — Unspecified kidney failure[Excludes1](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• I12 — Hypertensive chronic kidney disease[Excludes2](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N14.11 — Contrast-induced nephropathy[Excludes2](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• S37.0 — Injury of kidney[Excludes2]: “acute kidney injury (nontraumatic) (N17.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code First instructions

• I5A — Non-ischemic myocardial injury (non-traumatic)[Code First](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Use Additional Code instructions

• B33.4 — Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS][Use Additional Code]: “code to identify any associated acute kidney failure (N17.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I75.81 — Atheroembolism of kidney[Use Additional Code](via N17.-): “code for any associated acute kidney failure and chronic kidney disease (N17.-, N18.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• M31.11 — Hematopoietic stem cell transplantation-associated thrombotic microangiopathy [HSCT-TMA][Use Additional Code](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• R65.11 — Systemic inflammatory response syndrome (SIRS) of non-infectious origin with acute organ dysfunction[Use Additional Code](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• R65.2 — Severe sepsis[Use Additional Code](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions (13)

• D59.3 — Hemolytic-uremic syndrome[Code Also](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• I16.1 — Hypertensive emergency[Code Also](via N17.-): “acute kidney injury (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• M35.81 — Multisystem inflammatory syndrome[Code Also](via N17.-): “acute kidney failure (N17.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N00 — Acute nephritic syndrome[Code Also](via N17.-): “any associated kidney failure (N17-N19).”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N00-N08 — Glomerular diseases (N00-N08)[Code Also](via N17.-): “any associated kidney failure (N17-N19).”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N01 — Rapidly progressive nephritic syndrome[Code Also](via N17.-): “any associated kidney failure (N17-N19).”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N02 — Recurrent and persistent hematuria[Code Also](via N17.-): “any associated kidney failure (N17-N19).”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• N03 — Chronic nephritic syndrome[Code Also](via N17.-): “any associated kidney failure (N17-N19).”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 5 more

Clinical classification (CCSR)

• GEN002 — Acute and unspecified renal failure[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• CC — Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (CC).”— CMS MS-DRG Definitions Manual (Appendix C) · FY2026
• DRG 673 — OTHER KIDNEY AND URINARY TRACT PROCEDURES WITH MCC[MS-DRG]: “OTHER KIDNEY AND URINARY TRACT PROCEDURES WITH MCC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 674 — OTHER KIDNEY AND URINARY TRACT PROCEDURES WITH CC[MS-DRG]: “OTHER KIDNEY AND URINARY TRACT PROCEDURES WITH CC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 675 — OTHER KIDNEY AND URINARY TRACT PROCEDURES WITHOUT CC/MCC[MS-DRG]: “OTHER KIDNEY AND URINARY TRACT PROCEDURES WITHOUT CC/MCC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 682 — RENAL FAILURE WITH MCC[MS-DRG]: “RENAL FAILURE WITH MCC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 683 — RENAL FAILURE WITH CC[MS-DRG]: “RENAL FAILURE WITH CC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 684 — RENAL FAILURE WITHOUT CC/MCC[MS-DRG]: “RENAL FAILURE WITHOUT CC/MCC (MDC 11)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 791 — PREMATURITY WITH MAJOR PROBLEMS[MS-DRG]: “PREMATURITY WITH MAJOR PROBLEMS (MDC 15)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• and 1 more

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. 3,574 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026
• 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 · FY2026

Index entries

• Failure, failed, renal, acute[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Injury, kidney, acute (nontraumatic)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Necrosis, necrotic (ischemic), kidney (bilateral), acute[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• N17 — Acute kidney failure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• N17.0 — Acute kidney failure with tubular necrosis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• N17.1 — Acute kidney failure with acute cortical necrosis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• N17.2 — Acute kidney failure with medullary necrosis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• N17.8 — Other acute kidney failure[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Relevant guides

• How Do I Code Acute Kidney Injury (AKI)? N17.9, Acute Tubular Necrosis, and AKI on Top of Chronic Kidney Disease →

Common coding questions

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 FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 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 — v43 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 structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary, coding notes, decision checklist and FAQ answers MedCoder 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.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N17.9 in its code family, with their registry titles.

• N17 — Acute kidney failure
• N17.0 — Acute kidney failure with tubular necrosis
• N17.1 — Acute kidney failure with acute cortical necrosis
• N17.2 — Acute kidney failure with medullary necrosis
• N17.8 — Other acute kidney failure

View all codes in the N17 family