2026 ICD-10-CM Diagnosis Code Q89.9Congenital malformation, unspecified

ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q89

ICD-10-CM Q89.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q89.9 is a billable ICD-10-CM diagnosis code for congenital malformation, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 951. 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

ICD-10-CM Code
Q89.9
Billable Status
Yes — Valid for Submission
Code Describes
Congenital malformation, unspecified
Short Description
Congenital malformation, unspecified
Same as the full description in the CMS dataset.
Parent Code
Q89
Other congenital malformations, not elsewhere classified

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ80-Q89Other congenital malformations
CategoryQ89Other congenital malformations, not elsewhere classified
This CodeQ89.9Congenital malformation, unspecified

Present on Admission (POA)Billing

Q89.9 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.

  • Amegakaryocytic thrombocytopenia
  • Amegakaryocytic thrombocytopenia with congenital malformation
  • Congenital abnormal shape of rib
  • Congenital anomaly of back
  • Congenital anomaly of mother complicating pregnancy
  • Congenital deformity
  • Congenital disease
  • Congenital malformation
  • Congenital malformation syndrome
  • Congenital pectus carinatum
  • Congenital porencephaly
  • Congenital sequelae of disorders
  • Deformity
  • Deformity of sternum
  • Dysmorphism
  • Dysmorphism, pectus carinatum, joint laxity syndrome
  • Dysmorphism, short stature, deafness, disorder of sex development syndrome
  • Malformation sequence
  • Pectus carinatum
  • Pectus deformity of chest
  • Porencephaly, cerebellar hypoplasia, internal malformations syndrome
  • Pulmonary hypertension due to developmental abnormality
  • Single congenital anomaly
  • Spinocerebellar ataxia dysmorphism syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Congenital anomaly NOS
  • Congenital deformity NOS

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL010
Other specified and unspecified congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Pectus Carinatum

    a developmental anomaly characterized by abnormal anterior protrusion of the sternum and adjacent costal cartilage.

  • Congenital Malformation Syndrome

    a syndrome characterized by the presence of congenital abnormalities that affect more than one organ or system.

  • Congenital Malformation Syndrome Related to Known Exogenous Cause|Congenital Malformation Syndrome due to Known Exogenous Cause|Congenital Malformation Syndrome due to Known Exogenous Cause

    a syndrome characterized by the presence of structural malformations that are present at birth and can be attributed to an exogenous cause.

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 Q89.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
759.9 Congenital anomaly NOS
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q89.9Overview

What is the ICD-10 code for congenital malformation, unspecified?

The ICD-10-CM code for congenital malformation, unspecified is Q89.9 (sometimes written as Q899). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Q89.9 (Other congenital malformations, not elsewhere classified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital malformation, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q89.9 group to?

When congenital malformation, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.556. Higher weights mean higher Medicare reimbursement.

Is Q89.9 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, unspecified on inpatient claims. The code appears in the Other congenital malformations (Q80-Q89) range of the CMS exempt list.

What is the ICD-9 equivalent of Q89.9?

Under the General Equivalence Mappings, congenital malformation, unspecified converts to ICD-9-CM 759.9 (congenital anomaly NOS). The mapping is a direct match.