2027 ICD-10-CM Diagnosis Code Q89.3Situs inversus
ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q89
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q89.3 is a billable ICD-10-CM diagnosis code for situs inversus. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 393 through 395. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 3 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified congenital anomalies.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q89.3 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Other congenital malformations (Q80-Q89).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Agnathia, holoprosencephaly, situs inversus syndrome
- Atrial situs inversus
- Complete situs inversus with dextrocardia
- Congenital malposition of heart
- Dextrocardia
- Immotile cilia syndrome
- Kartagener syndrome
- Laterality sequence
- Situs inversus abdominalis
- Situs inversus thoracis
- Situs inversus viscerum
- Situs inversus with levocardia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q89.3: its own notes plus those printed at Chapter 17. 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.
- 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: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- dextrocardia NOS (Q24.0)
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.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q89.3, its category, or a range that includes it.
Excludes1 4
These codes carry an Excludes1 note naming Q89.3: they are not reported together with it, unless the two conditions are unrelated.
- Q20 Congenital malformations of cardiac chambers and connectionsdextrocardia with situs inversus (Q89.3)
- Q20 Congenital malformations of cardiac chambers and connectionsmirror-image atrial arrangement with situs inversus (Q89.3)
- Q24.0 Dextrocardiadextrocardia with situs inversus (Q89.3)
- Q24.0 Dextrocardiamirror-image atrial arrangement with situs inversus (Q89.3)
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Syndrome See Also: Disease;
Kartagener's Q89.3
Transposition (congenital) See Also: Malposition, congenital;
Kartagener's Q89.3
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Situs Inversus
a congenital abnormality in which organs in the thorax and the abdomen are opposite to their normal positions (situs solitus) due to lateral transposition. normally the stomach and spleen are on the left, liver on the right, the three-lobed right lung is on the right, and the two-lobed left lung on the left. situs inversus has a familial pattern and has been associated with a number of genes related to microtubule-associated proteins.
Patient EducationClinical
Birth Defects
A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.
The full article covers:
- What are birth defects?
- What causes birth defects?
- Who is at risk of having a baby with birth defects?
- How are birth defects diagnosed?
- What are the treatments for birth defects?
- Can birth defects be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q89.3 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q89.3Overview
What is the ICD-10 code for situs inversus?
The ICD-10-CM code for situs inversus is Q89.3 (sometimes written as Q893). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q89.3 (Other congenital malformations, not elsewhere classified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report situs inversus on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q89.3 group to?
When situs inversus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 394, 395, 393, with relative weights from 0.6379 to 1.5877 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q89.3 a CC or MCC?
CMS lists Q89.3 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 3 closely related codes in its exclusion list.
Is Q89.3 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for situs inversus on inpatient claims. The code appears in the Other congenital malformations (Q80-Q89) range of the CMS exempt list.
