T79.5XXA ICD-10-CM Code: Traumatic anuria, initial encounter

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T79.5XXA 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 T79.5XXA itself; “inherited from” names the category or block whose note applies here.

7th Character Guide

"The appropriate 7th character is to be added to each code from category T79"

• A — initial encounter (this page’s code)
• D — subsequent encounter
• S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

T79.5XXA, T79.5XXD, T79.5XXS

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Coder workflow for T79.5XXA

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

Before you code T79.5XXA

1. A 7th character is required in this family. Confirm the documented encounter: initial (active treatment), subsequent (healing or recovery phase), or sequela. This page’s code carries “A”. “Initial” means active treatment, not the first visit (Guidelines I.C.19.a).

   See the 7th Character Guide · Guide: 7th characters: initial, subsequent, sequela →

Choose the right path

1. Is the encounter phase documented — active treatment, healing or recovery, or a sequela?
   Yes → Assign the matching 7th character; the variant codes are in the 7th Character Guide.
   No → The code is invalid without its 7th character — query for the missing element.

Consider T79.5XXA. 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).

Encounter type

Active treatment, healing or recovery phase, or sequela — the basis of the 7th character (Guidelines I.C.19.a).

Official instructions as workflow

• Excludes2 — not part of T79.5XXA(4 notes)

  Coding workflow: The conditions named in this note are not included in T79.5XXA. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareJ80, P22.0

  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

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 T79.5XXA with…

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

The codes most likely to be picked instead of T79.5XXA — 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.

• T79.5XXD— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a subsequent encounter moves the case to T79.5XXD.

  Full comparison: T79.5XXA vs T79.5XXD →

• T79.5XXS— Encounter relationship (Review)

  Same underlying diagnosis, different encounter phase.

  The same diagnosis at a different phase of care; one encounter takes one 7th character.

  What moves you there: Documentation of a sequela moves the case to T79.5XXS.

  Full comparison: T79.5XXA vs T79.5XXS →

• J80— 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 acute respiratory distress syndrome adds J80; it is not part of this code and both may be reported when both are documented.

  Full comparison: T79.5XXA vs J80 →

• T80— 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 complications occurring during or following medical procedures adds T80; it is not part of this code and both may be reported when both are documented.

  Full comparison: T79.5XXA vs T80 →

• T88— 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 complications occurring during or following medical procedures adds T88; it is not part of this code and both may be reported when both are documented.

  Full comparison: T79.5XXA vs T88 →

• P22.0— 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 newborn respiratory distress syndrome adds P22.0; it is not part of this code and both may be reported when both are documented.

  Full comparison: T79.5XXA vs P22.0 →

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.

Verify Before Coding

• MCC 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

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: MCC — Major 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 178 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 11 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), DRG 963 (MDC 24), DRG 964 (MDC 24) +1 more.

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

Clinical classification (AHRQ CCSR):INJ026 — Other specified injury (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 MCC — 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.

N99.820 — Postprocedural hemorrhage of a genitourinary system organ or structure following a genitourinary system procedure, N99.821 — Postprocedural hemorrhage of a genitourinary system organ or structure following other procedure, N99.840 — Postprocedural hematoma of a genitourinary system organ or structure following a genitourinary system procedure, N99.841 — Postprocedural hematoma of a genitourinary system organ or structure following other procedure, N99.842 — Postprocedural seroma of a genitourinary system organ or structure following a genitourinary system procedure, N99.843 — Postprocedural seroma of a genitourinary system organ or structure following other procedure, T07.XXXA — Unspecified multiple injuries, initial encounter, T14.8XXA — Other injury of unspecified body region, initial encounter, T14.90XA — Injury, unspecified, initial encounter, T14.91XA — Suicide attempt, initial encounter, T79.8XXA — Other early complications of trauma, initial encounter, T79.9XXA — Unspecified early complication of trauma, initial encounter, T79.A0XA — Compartment syndrome, unspecified, initial encounter, T79.A11A — Traumatic compartment syndrome of right upper extremity, initial encounter, T79.A12A — Traumatic compartment syndrome of left upper extremity, initial encounter, T79.A19A — Traumatic compartment syndrome of unspecified upper extremity, initial encounter, T79.A21A — Traumatic compartment syndrome of right lower extremity, initial encounter, T79.A22A — Traumatic compartment syndrome of left lower extremity, initial encounter, T79.A29A — Traumatic compartment syndrome of unspecified lower extremity, initial encounter, T79.A3XA — Traumatic compartment syndrome of abdomen, initial encounter, +157 more

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

T79.5XXD — Traumatic anuria, subsequent encounterCompare T79.5XXA vs T79.5XXD →, T79.5XXS — Traumatic anuria, sequelaCompare T79.5XXA vs T79.5XXS →

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified injury).

S99.811A — Other specified injuries of right ankle, initial encounter, S99.812A — Other specified injuries of left ankle, initial encounter, S99.819A — Other specified injuries of unspecified ankle, initial encounter, S99.821A — Other specified injuries of right foot, initial encounter, S99.822A — Other specified injuries of left foot, initial encounter, S99.829A — Other specified injuries of unspecified foot, initial encounter, T79.0XXA — Air embolism (traumatic), initial encounter, T79.1XXA — Fat embolism (traumatic), initial encounter, T79.2XXA — Traumatic secondary and recurrent hemorrhage and seroma, initial encounter, T79.4XXA — Traumatic shock, initial encounter, T79.6XXA — Traumatic ischemia of muscle, initial encounter, T79.7XXA — Traumatic subcutaneous emphysema, initial encounter, T79.8XXA — Other early complications of trauma, initial encounter, T79.9XXA — Unspecified early complication of trauma, initial encounter, T79.A0XA — Compartment syndrome, unspecified, initial encounter, T79.A11A — Traumatic compartment syndrome of right upper extremity, initial encounter, T79.A12A — Traumatic compartment syndrome of left upper extremity, initial encounter, T79.A19A — Traumatic compartment syndrome of unspecified upper extremity, initial encounter, T79.A21A — Traumatic compartment syndrome of right lower extremity, initial encounter, T79.A22A — Traumatic compartment syndrome of left lower extremity, initial encounter, +48 more

Contextual Map

Every relationship of T79.5XXA 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.

Hierarchy

• S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79-T79 — Certain early complications of trauma[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• INJ026 — Other specified injury[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper (11)

• MCC — Major Complication or Comorbidity [MS-DRG severity]: “As a secondary diagnosis this code can raise the stay's MS-DRG severity tier (MCC).”— 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 4 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

Nearest codes (40)

• T79 — Certain early complications of trauma, not elsewhere classified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.0 — Air embolism (traumatic)[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.0XXA — Air embolism (traumatic), initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.0XXD — Air embolism (traumatic), subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.0XXS — Air embolism (traumatic), sequela[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.1 — Fat embolism (traumatic)[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.1XXA — Fat embolism (traumatic), initial encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• T79.1XXD — Fat embolism (traumatic), subsequent encounter[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• and 32 more

Change history

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

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 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 T79.5XXA in its code family, with their registry titles.

• T79.4 — Traumatic shock
• T79.4XXA — Traumatic shock, initial encounter
• T79.4XXD — Traumatic shock, subsequent encounter
• T79.4XXS — Traumatic shock, sequela
• T79.5 — Traumatic anuria
• T79.5XXD — Traumatic anuria, subsequent encounter
• T79.5XXS — Traumatic anuria, sequela
• T79.6 — Traumatic ischemia of muscle
• T79.6XXA — Traumatic ischemia of muscle, initial encounter
• T79.6XXD — Traumatic ischemia of muscle, subsequent encounter

View all codes in the T79 family