ICD10BillableValid for clinical use
ICD-10 Code E70.0: Classical phenylketonuria
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Endocrine, nutritional and metabolic diseases (E00-E89).
When is it used?
- May be used when a clinician documents classical phenylketonuria in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
4Endocrine, nutritional and metabolic diseases (E00-E89)
block
E70-E88Metabolic disorders
category
E70Disorders of aromatic amino-acid metabolism
currentE70
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
EndocrinologistGeneral Physician
Related codes
E70.1Other hyperphenylalaninemiascodeE70.2Disorders of tyrosine metabolismcategoryE70.3AlbinismcategoryE70.4Disorders of histidine metabolismcategoryE70.5Disorders of tryptophan metabolismcodeE70.8Other disorders of aromatic amino-acid metabolismcategoryE70.9Disorder of aromatic amino-acid metabolism, unspecifiedcode
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 7573000high
Classical phenylketonuria
Source: SNOMED International ICD-10 map
SNOMED_CT 890435004high
Classical phenylketonuria with partial deficiency of phenylalanine hydroxylase
Source: SNOMED International ICD-10 map
SNOMED_CT 890436003high
Classical phenylketonuria with total deficiency of phenylalanine hydroxylase
Source: SNOMED International ICD-10 map
SNOMED_CT 12957008high
Disorder of phenylalanine metabolism
Source: SNOMED International ICD-10 map
SNOMED_CT 297225000high
Maternal phenylketonuria
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
E70.0
Common synonyms
Classical phenylketonuria
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.