FY2027 ICD-10-CM reference
E05: Thyrotoxicosis [hyperthyroidism]
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Thyrotoxicosis [hyperthyroidism]. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
CMS-HCC V28
Not applicable to this nonbillable heading
CMS-HCC V24
Not applicable to this nonbillable heading
ESRD
Not applicable to this nonbillable heading
PACE
Not applicable to this nonbillable heading
RxHCC
Not applicable to this nonbillable heading
HHS-HCC
Not applicable to this nonbillable heading
More specific FY2027 codes
- E05.0: Thyrotoxicosis with diffuse goiterNonbillable heading
- E05.1: Thyrotoxicosis with toxic single thyroid noduleNonbillable heading
- E05.2: Thyrotoxicosis with toxic multinodular goiterNonbillable heading
- E05.3: Thyrotoxicosis from ectopic thyroid tissueNonbillable heading
- E05.4: Thyrotoxicosis factitiaNonbillable heading
- E05.8: Other thyrotoxicosisNonbillable heading
- E05.9: Thyrotoxicosis, unspecifiedNonbillable heading
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: E00-E89 (chapter, inherited).
Excludes1
transitory endocrine and metabolic disorders specific to newborn (P70-P74)
Source: E00-E89 (chapter, inherited).
Excludes1
chronic thyroiditis with transient thyrotoxicosis (E06.2)
Source: E05 (category, direct).
Excludes1
neonatal thyrotoxicosis (P72.1)
Source: E05 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does E05 mean in FY2027?
The official ICD-10-CM descriptor is Thyrotoxicosis [hyperthyroidism]. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is E05 billable in FY2027?
The FY2027 order file marks E05 as a nonbillable heading. Select a complete billable child code.
Does E05 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition