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ICD-10-CM Code E72.4
Disorders of ornithine metabolism

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

E72.4 is a billable ICD code used to specify a diagnosis of disorders of ornithine metabolism. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code E724 is used to code Ornithine transcarbamylase deficiency

Ornithine transcarbamylase deficiency also known as OTC deficiency is the most common urea cycle disorder in humans. Ornithine transcarbamylase, the defective enzyme in this disorder is the final enzyme in the proximal portion of the urea cycle, responsible for converting carbamoyl phosphate and ornithine into citrulline. OTC deficiency is inherited in an X-linked recessive manner, meaning males are more commonly affected than females. In severely affected individuals, ammonia concentrations increase rapidly causing ataxia, lethargy and death without rapid intervention. OTC deficiency is diagnosed using a combination of clinical findings and biochemical testing, while confirmation is often done using molecular genetics techniques. Once an individual has been diagnosed, the treatment goal is to avoid precipitating episodes that can cause an increased ammonia concentration. The most common treatment combines a low protein diet with nitrogen scavenging agents. Liver transplant is considered curative for this disease. Experimental trials of gene therapy resulted in the death of one participant and have been discontinued.

Specialty: Endocrinology
MeSH Code: D020163
ICD 9 Code: 270.6


Source: Wikipedia

Coding Notes for E72.4 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Hyperammonemia-Hyperornithinemia-Homocitrullinemia syndrome
Ornithinemia (types I, II)
Ornithine transcarbamylase deficiency
Code Type-1 Excludes:
Type-1 Excludes
Type-1 Excludes mean the conditions excluded are mutually exclusive and should never be coded together. Excludes 1 means "do not code here."
Hereditary choroidal dystrophy - instead, use code H31.2-

MS-DRG Mapping

  • DRG Group #642 - Inborn and other disorders of metabolism.

ICD-10-CM Alphabetical Index References for 'E72.4 - Disorders of ornithine metabolism'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code E72.4. Click on any term below to browse the alphabetical index.

Ornithine metabolism disorder (E72.4)
Ornithinemia(Type I) (Type II) (E72.4)
Hyperornithinemia (E72.4)


Disorders of urea cycle metabolism (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code E72.4 and a single ICD9 code, 270.6 is an approximate match for comparison and conversion purposes.

Parent Code: E72 - Other disorders of amino-acid metabolism

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/E724