E70.40 — Disorders of histidine metabolism, unspecified
Is E70.40 billable?
Yes, but E70.40 is an unspecified code. E70.40 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, E70.40 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting E70.40 — the more specific alternatives are listed below.
More specific alternatives
E70.40 at a glance
| Code | E70.40 |
|---|---|
| Description | Disorders of histidine metabolism, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does E70.40 group to?
E70.40 sits in MDC 10 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 642Inborn and Other Disorders of Metabolismmedical
As a secondary diagnosis, E70.40 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is E70.40 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to E70.40. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Disorder › histidine metabolism (of)
- Disturbance › metabolism › histidine (s)
- Disorder › metabolism NOS › amino-acid › aromatic › histidine (of)
Excludes1 — never code together — inherited from Chapter 4
The conditions below can never be reported together with E70.40 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Excludes1 — never code together — inherited from E70-E88
The conditions below can never be reported together with E70.40 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Excludes2 — not included here — inherited from E70-E88
The conditions below are not part of E70.40, but a patient may have both at the same time. When documentation supports it, E70.40 and the excluded code may both be reported.
- Ehlers-Danlos syndromes (Q79.6-)
How long has E70.40 existed?
E70.40 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.