FY2027 ICD-10-CM reference
T32.77: Corrosions involving 70-79% of body surface with 70-79% third degree corrosion
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Corrosions involving 70-79% of body surface with 70-79% third degree corrosion. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
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
Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
Source: S00-T88 (chapter, inherited).
Instructional note
code to identify any retained foreign body, if applicable (Z18.-)
Source: S00-T88 (chapter, inherited).
Excludes2
birth trauma (P10-P15)
Source: S00-T88 (chapter, inherited).
Excludes2
obstetric trauma (O70-O71)
Source: S00-T88 (chapter, inherited).
Instructional note
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Source: S00-T88 (chapter, inherited).
Instructional note
This category is to be used as the primary code only when the site of the corrosion is unspecified. It may be used as a supplementary code with categories T20-T25 when the site is specified.
Source: T32 (category, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does T32.77 mean in FY2027?
The official ICD-10-CM descriptor is Corrosions involving 70-79% of body surface with 70-79% third degree corrosion. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is T32.77 billable in FY2027?
The FY2027 order file marks T32.77 as billable. Check the complete Tabular instructions and documentation before assigning it.
Does T32.77 map to an HCC?
In the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service), T32.77 maps to CMS-HCC V28 HCC 385 (Severe Skin Burn or Condition). For 2027 dates of service, CMS has not yet published the payment year 2028 mappings. ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition