2027 ICD-10-CM Diagnosis Code Q43.9Congenital malformation of intestine, unspecified
ICD-10-CM Codes›Q00-Q99›Q38-Q45›Q43
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- POA Exempt
- Chronic Condition
Q43.9 is a billable ICD-10-CM diagnosis code for congenital malformation of intestine, unspecified. 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 21 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Digestive congenital anomalies.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q43.9 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Other congenital malformations of the digestive system (Q38-Q45).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Absent radius, anogenital anomalies syndrome
- Anal atresia
- Anorectal anomaly
- Anorectal fistula
- Aplasia of bone of radius and/or ulna
- Aplasia of radius
- Atrioventricular septal defect, blepharophimosis, radial and anal defect syndrome
- Congenital absence of radius
- Congenital anomaly of anus
- Congenital anomaly of duodenum
- Congenital anomaly of intestinal tract
- Congenital anomaly of large intestine
- Congenital anomaly of rectum
- Congenital anomaly of small intestine
- Congenital anorectal fistula due to high anorectal malformation
- Congenital anorectal fistula due to intermediate anorectal malformation
- Congenital anorectal fistula due to low anorectal malformation
- Congenital fistula of anus
- Congenital fistula of rectum
- Congenital fistula of rectum and anus
- Congenital nephritis
- Congenital non-syndromic anorectal malformation
- Craniosynostosis, anal anomaly, porokeratosis syndrome
- Lowe Kohn Cohen syndrome
- Manitoba oculotrichoanal syndrome
- Primary desmosis coli
- Severe intellectual disability, epilepsy, anal anomaly, distal phalangeal hypoplasia syndrome
- STAR syndrome
- Telecanthus
- Thymic, renal, anal, lung dysplasia syndrome
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q43.9: its own notes plus those printed at Chapter 17. A note printed at a category, block or chapter applies to every code under it.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Anomaly, anomalous (congenital) (unspecified type) Q89.9
anus Q43.9
cecum Q43.9
colon Q43.9
digestive organ (s) or tract Q45.9
lower Q43.9
duodenum Q43.9
ileocecal (coil) (valve) Q43.9
ileum Q43.9
rectum Q43.9
sigmoid (flexure) Q43.9
congenital Q43.9
cecum (congenital) Q43.9
colon (congenital) Q43.9
duodenum (congenital) Q43.9
ileocecal (coil) (valve) (acquired) K63.89
congenital Q43.9
ileum (congenital) Q43.9
rectum (congenital) Q43.9
Maldevelopment See Also: Anomaly;
colon Q43.9
Malformation (congenital) See Also: Anomaly;
intestine Q43.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 Q43.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q43.9Overview
What is the ICD-10 code for congenital malformation of intestine, unspecified?
The ICD-10-CM code for congenital malformation of intestine, unspecified is Q43.9 (sometimes written as Q439). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q43.9 (Other congenital malformations of intestine) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation of intestine, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q43.9 group to?
When congenital malformation of intestine, unspecified 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 Q43.9 a CC or MCC?
CMS lists Q43.9 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 21 closely related codes in its exclusion list.
Is Q43.9 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 congenital malformation of intestine, unspecified on inpatient claims. The code appears in the Other congenital malformations of the digestive system (Q38-Q45) range of the CMS exempt list.
