E72.1
Disorders of sulfur-bearing amino-acid metabolism
Clinical Classification Guidelines
Excludes Type 1
- cystinosis (E72.04)
- cystinuria (E72.01)
- transcobalamin II deficiency (D51.2)
Medical Intelligence & Overview
Disorders of sulfur-bearing amino-acid metabolism encompass a group of rare genetic conditions that affect how the body processes amino acids containing sulfur. These amino acids, mainly methionine and cysteine, are vital for normal bodily functions, including the production of proteins, detoxification, and other metabolic processes. When these pathways are disrupted, it can lead to an accumulation of certain substances in the body, potentially causing health issues. Recognizing these conditions is important for proper management and treatment.
Causes & Symptoms
Clinical Causes: Genetic mutations affecting specific enzymes involved in sulfur amino acid metabolism Inherited patterns, typically autosomal recessive inheritance Deficiencies or abnormalities in enzymes such as cystathionine beta-synthase or methylmalonyl-CoA mutase
Key Symptoms: Failure to thrive in infants Developmental delays or intellectual disabilities Seizures or epileptic episodes Poor muscle tone (hypotonia) Unusual body odor or skin odor Liver dysfunction or hepatomegaly Elevated levels of sulfur amino acids in blood or urine Possible neurological symptoms like irritability or movement disorders
Diagnostic & Treatment
Diagnosis Path: Diagnosis primarily involves biochemical testing, including blood and urine analyses to detect abnormal levels of amino acids and their metabolites. Specific enzyme assays may be performed to identify defective metabolic pathways. Genetic testing can confirm mutations in genes associated with sulfur amino acid metabolism. Early diagnosis is crucial for initiating appropriate management strategies to prevent complications.
Treatment Protocols: Management typically focuses on dietary modifications to limit intake of sulfur-containing amino acids. This may include specialized low-protein diets or formula supplements designed for metabolic conditions. In some cases, vitamin or cofactor supplementation can enhance residual enzyme activity. Regular monitoring of amino acid levels and neurological assessments are vital. Treatment plans are tailored to the specific disorder and individual patient needs, often involving a multidisciplinary team including metabolic specialists, dietitians, and neurologists.
Clinical Advice & FAQs
Billing Guidance
Is E72.1 a billable ICD-10 code?
Yes, E72.1 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report E72.1?
Clinical documentation must specify the nature of Disorders of sulfur-bearing amino-acid metabolism and any associated comorbidities for accurate reporting.
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