ICD-10-CM › E00-E89 › E70-E88 › E70 Disorders of aromatic amino-acid metabolism › E70.5
Disorders of tryptophan metabolism
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Disorders of tryptophan metabolism
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from the E70-E88 section Metabolic disorders (E70-E88)
Excludes1 - never coded here
- androgen insensitivity syndrome (E34.5-)
- congenital adrenal hyperplasia (E25.0)
- hemolytic anemias attributable to enzyme disorders (D55.-)
- Marfan syndrome (Q87.4-)
- 5-alpha-reductase deficiency (E29.1)
Excludes2 - not included here
- Ehlers-Danlos syndromes (Q79.6-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Disorder > tryptophan metabolism
- Disturbance > metabolism > tryptophan
- Disorder > metabolism NOS > amino-acid > aromatic > tryptophan
Codes in the same group
| Code | Description | Status |
|---|---|---|
| E70.0 | Classical phenylketonuria | Valid |
| E70.1 | Other hyperphenylalaninemias | Valid |
| E70.2 | Disorders of tyrosine metabolism | Not billable |
| E70.3 | Albinism | Not billable |
| E70.4 | Disorders of histidine metabolism | Not billable |
| E70.8 | Other disorders of aromatic amino-acid metabolism | Not billable |
| E70.9 | Disorder of aromatic amino-acid metabolism, unspecified | Valid |