COH88 2025 (NAVD88) height - EPSG:10918

WKT

VERTCS["COH88_2025_(NAVD88)_height", 
	VDATUM["Derived_California_Orthometric_Heights_of_1988_epoch_2025"], 
	PARAMETER["Vertical_Shift", 0.0], 
	PARAMETER["Direction", 1.0], 
	UNIT["Meter", 1.0]]

WKT2

VERTCRS["COH88_2025_(NAVD88)_height", 
	VDATUM["Derived_California_Orthometric_Heights_of_1988_epoch_2025"], 
	CS[vertical, 1], 
	AXIS["Gravity-related height (H)", up, 
		LENGTHUNIT["Meter", 1.0]], 
	ID["EPSG", "10918"]]

Data from @esri/proj-codes

{
  "wkid": 10918,
  "latestWkid": 10918,
  "macro": "PE_VCS_COH88_2025_NAVD88_HEIGHT",
  "name": "COH88_2025_(NAVD88)_height",
  "wkt": "VERTCS[\"COH88_2025_(NAVD88)_height\",VDATUM[\"Derived_California_Orthometric_Heights_of_1988_epoch_2025\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]",
  "wkt2": "VERTCRS[\"COH88_2025_(NAVD88)_height\",VDATUM[\"Derived_California_Orthometric_Heights_of_1988_epoch_2025\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]],ID[\"EPSG\",\"10918\"]]",
  "description": "COH88 2025 (NAVD88) height",
  "authority": "EPSG",
  "version": "12.016(13.6.0)",
  "deprecated": "no",
  "areaname": "USA - California",
  "extent": {
    "slat": 32.53,
    "nlat": 42.01,
    "llon": -124.45,
    "rlon": -114.12
  }
}