Corrosion of second degree of male genital region, sequela
curl https://api.healthcare.dev/v1/codes/icd10cm/T21.66XS \ -H "Authorization: Bearer $HDEV_API_KEY"
{
"data": {
"code": "T21.66XS",
"parent": "T21.66",
"status": "active",
"system": "icd10cm",
"display": "Corrosion of second degree of male genital region, sequela",
"billable": true,
"description": "Corrosion of second degree of male genital region, sequela",
"replaced_by": [],
"effective_end": null,
"effective_start": "2026-10-01",
"care_categories": [
"burns"
],
"care_category_details": [
{
"slug": "burns",
"name": "Burns",
"confidence": 0.95,
"derivation": "source_stated",
"evidence": [
{
"url": "https://www.cms.gov/medicare/coding-billing/icd-10-codes",
"anchor": "ICD-10-CM block T20-T32"
}
],
"as_of": "2026-10-01T00:00:00.000Z"
}
]
},
"meta": {
"source": "cms-icd10",
"data_version": "fy2027"
}
}Hierarchy
None: T21.66XS is a billable code at the most specific level.
Change history
T21.66XS has been in effect since 2026-10-01. This page shows ICD-10-CM release fy2027.
Add as_of=YYYY-MM-DD to the request to get this code exactly as it was on a past date. The change feed (GET /v1/changes) lists what each release added, changed or retired across the whole dataset; a per-code change list isn't published yet.
Use it
curl https://api.healthcare.dev/v1/codes/icd10cm/T21.66XS \ -H "Authorization: Bearer $HDEV_API_KEY"
Using the healthcare.dev MCP server, look up ICD-10-CM code T21.66XS. Tell me what it means, whether it is billable, whether it is active, and list its parent and child codes.
Source: CMS and CDC NCHS, release fy2027. Public domain. Reference data, not medical or billing advice.