NAD 1983 (CORS96) - ESRI:115756

WKT

VERTCS["NAD_1983_CORS96", 
	DATUM["D_NAD_1983_CORS96", 
		SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["NAD_1983_CORS96", 
	DYNAMIC[
		FRAMEEPOCH[1997.0], 
		MODEL["HTDP"]], 
	DATUM["D_NAD_1983_CORS96", 
		ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
	CS[vertical, 1], 
	AXIS["Ellipsoidal height (h)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["Esri", "115756"]]

Data from @esri/proj-codes

{
  "wkid": 115756,
  "latestWkid": 115756,
  "macro": "PE_VCS_NAD_1983_CORS96",
  "name": "NAD_1983_CORS96",
  "wkt": "VERTCS[\"NAD_1983_CORS96\",DATUM[\"D_NAD_1983_CORS96\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"NAD_1983_CORS96\",DYNAMIC[FRAMEEPOCH[1997.0],MODEL[\"HTDP\"]],DATUM[\"D_NAD_1983_CORS96\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],CS[vertical,1],AXIS[\"Ellipsoidal height (h)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"Esri\",\"115756\"]]",
  "description": "NAD 1983 (CORS96)",
  "authority": "Esri",
  "version": "10.4.0",
  "deprecated": "no",
  "areaname": "USA - CONUS and Alaska; PRVI",
  "extent": {
    "slat": 14.92,
    "nlat": 74.71,
    "llon": 167.65,
    "rlon": -63.88
  }
}