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Q89.3 ICD-10-CM Code: Situs inversus

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

Coding at a Glance

Tabular directives
6 inclusion terms · 1 Excludes1

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 v43, Appendix B.

  • MS-DRG 393 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITH MCC (MDC 06)
  • MS-DRG 394 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITH CC (MDC 06)
  • MS-DRG 395 — OTHER DIGESTIVE SYSTEM DIAGNOSES WITHOUT CC/MCC (MDC 06)

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 Q89.3 in the official ICD-10-CM tabular list, quoted as published.

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

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Dextrocardia with situs inversus
  • Mirror-image atrial arrangement with situs inversus
  • Situs inversus or transversus abdominalis
  • Situs inversus or transversus thoracis
  • Transposition of abdominal viscera
  • Transposition of thoracic viscera

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).

Coder workflow for Q89.3

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

Before you code Q89.3

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with Q89.3. 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 Q89.3’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.

    ReviewQ24.0

Consider Q89.3. 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).

Official instructions as workflow

  • Excludes1 — check before selecting Q89.3(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with Q89.3: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareQ24.0

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

Coding decision scenarios

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

Documentation: Both the condition Q89.3 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).

ReviewQ24.0

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.

Code Overview

Situs inversus is a billable ICD-10-CM diagnosis code (Q89.3).

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

Indexed Clinical Terms (14)

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.

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 Q89.3 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 2 Excludes1 notes: Q20 — Congenital malformations of cardiac chambers and connections, Q24.0 — Dextrocardia.

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

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 3 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 393 (MDC 06), DRG 394 (MDC 06), DRG 395 (MDC 06).

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

Clinical classification (AHRQ CCSR):MAL010 — Other specified and unspecified congenital anomalies (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.

Q89.7 — Multiple congenital malformations, not elsewhere classified, Q89.9 — Congenital malformation, unspecified

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified and unspecified congenital anomalies).

Q87.43 — Marfan syndrome with skeletal manifestation, Q87.5 — Other congenital malformation syndromes with other skeletal changes, Q87.81 — Alport syndrome, Q87.82 — Arterial tortuosity syndrome, Q87.83 — Bardet-Biedl syndrome, Q87.84 — Laurence-Moon syndrome, Q87.85 — MED13L syndrome, Q87.87 — Hao-Fountain Syndrome, Q87.88 — CTNNB1 syndrome, Q87.89 — Other specified congenital malformation syndromes, not elsewhere classified, Q89.01 — Asplenia (congenital), Q89.09 — Congenital malformations of spleen, Q89.1 — Congenital malformations of adrenal gland, Q89.2 — Congenital malformations of other endocrine glands, Q89.4 — Conjoined twins, Q89.7 — Multiple congenital malformations, not elsewhere classified, Q89.8 — Other specified congenital malformations, Q89.81 — Kabuki syndrome, Q89.89 — Other specified congenital malformations, Q89.9 — Congenital malformation, unspecified, +59 more

Same Index main term, other category

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

Q69.0 — Accessory finger(s) (congenital, finger, supernumerary), Q69.2 — Accessory toe(s) (congenital, toe, supernumerary), Q74.0 — Other congenital malformations of upper limb(s), including shoulder girdle (congenital, scapula), Q74.1 — Congenital malformation of knee (congenital, patella), Q74.2 — Other congenital malformations of lower limb(s), including pelvic girdle (congenital, symphysis pubis), Q76.5 — Cervical rib (congenital, rib, supernumerary in cervical region), Q76.6 — Other congenital malformations of ribs (congenital, rib), Q76.7 — Congenital malformation of sternum (congenital, sternum NEC), Q83.8 — Other congenital malformations of breast (congenital, breast), Q84.6 — Other congenital malformations of nails (congenital, nail), T82.120 — Displacement of cardiac electrode (device, implant or graft, electronic, cardiac, electrode), T82.121 — Displacement of cardiac pulse generator (battery) (device, implant or graft, electronic, cardiac, pulse generator), T82.128 — Displacement of other cardiac electronic device (device, implant or graft, electronic, cardiac, specified type NEC), T82.129 — Displacement of unspecified cardiac electronic device (device, implant or graft, electronic, cardiac), T82.42 — Displacement of vascular dialysis catheter (device, implant or graft, catheter NEC, dialysis), T82.524 — Displacement of infusion catheter (device, implant or graft, catheter NEC, infusion NEC), T83.020 — Displacement of cystostomy catheter (device, implant or graft, catheter NEC, cystostomy), T83.028 — Displacement of other urinary catheter (device, implant or graft, catheter NEC, urinary), T83.22 — Displacement of graft of urinary organ (device, implant or graft, urinary NEC, graft), T83.32 — Displacement of intrauterine contraceptive device (device, implant or graft, genital NEC, intrauterine contraceptive device), +70 more

Contextual Map

Every relationship of Q89.3 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 Q89.3 with these 2 related codes in Claim Check

Hierarchy

Excludes1

  • Q24.0 — Dextrocardia[Excludes1]: “dextrocardia NOS (Q24.0)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes1 notes

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 06 — Diseases and Disorders of the Digestive System[MDC crossing]: “Diseases and Disorders of the Digestive System — 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. 5,744 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries (14)

  • Dextrocardia (true), with, complete transposition of viscera[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Dextrocardia (true), with, situs inversus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Kartagener's syndrome or triad (sinusitis, bronchiectasis, situs inversus)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Levocardia (isolated), with situs inversus[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Malposition, congenital, heart, dextrocardia, with complete transposition of viscera[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Sinusitis-bronchiectasis-situs inversus (syndrome) (triad)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Situs inversus or transversus (abdominalis) (thoracis)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Syndrome, Kartagener's[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • and 6 more

Nearest codes (12)

Change history

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

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

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. "Q89.3 — Situs inversus." ICD-10-CM FY2026. https://medcoder.ai/icd10/code/q89.3-situs-inversus

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Situs inversus

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q89.3 in its code family, with their registry titles.

View all codes in the Q89 family