FEH2010 + FCSVR10 height - EPSG:9519

WKT

HVCOORDSYS["FEH2010_and_FCSVR10_height", 
	GEOGCS["GCS_FEH2010", 
		DATUM["D_Fehmarnbelt_Datum_2010", 
			SPHEROID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		UNIT["Degree", 0.0174532925199433]], 
	VERTCS["FCSVR10_Height", 
		VDATUM["Fehmarnbelt_Vertical_Reference_2010"], 
		PARAMETER["Vertical_Shift", 0.0], 
		PARAMETER["Direction", 1.0], 
		UNIT["Meter", 1.0]]]

WKT2

COMPOUNDCRS["FEH2010_and_FCSVR10_height", 
	GEOGCRS["GCS_FEH2010", 
		DATUM["D_Fehmarnbelt_Datum_2010", 
			ELLIPSOID["GRS_1980", 6378137.0, 298.257222101]], 
		PRIMEM["Greenwich", 0.0], 
		CS[ellipsoidal, 2], 
		AXIS["Latitude (lat)", north, 
			ORDER[1]], 
		AXIS["Longitude (lon)", east, 
			ORDER[2]], 
		ANGLEUNIT["Degree", 0.0174532925199433]], 
	VERTCRS["FCSVR10_Height", 
		VDATUM["Fehmarnbelt_Vertical_Reference_2010"], 
		CS[vertical, 1], 
		AXIS["Gravity-related height (H)", up, 
			LENGTHUNIT["Meter", 1.0]]], 
	ID["EPSG", "9519"]]

Data from @esri/proj-codes

{
  "wkid": 9519,
  "latestWkid": 9519,
  "pcsWkid": 0,
  "gcsWkid": 5593,
  "vcsWkid": 5597,
  "macro": "PE_HVC_FEH2010_FCSVR10_HEIGHT",
  "name": "FEH2010_and_FCSVR10_height",
  "wkt": "HVCOORDSYS[\"FEH2010_and_FCSVR10_height\",GEOGCS[\"GCS_FEH2010\",DATUM[\"D_Fehmarnbelt_Datum_2010\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],VERTCS[\"FCSVR10_Height\",VDATUM[\"Fehmarnbelt_Vertical_Reference_2010\"],PARAMETER[\"Vertical_Shift\",0.0],PARAMETER[\"Direction\",1.0],UNIT[\"Meter\",1.0]]]",
  "wkt2": "COMPOUNDCRS[\"FEH2010_and_FCSVR10_height\",GEOGCRS[\"GCS_FEH2010\",DATUM[\"D_Fehmarnbelt_Datum_2010\",ELLIPSOID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],CS[ellipsoidal,2],AXIS[\"Latitude (lat)\",north,ORDER[1]],AXIS[\"Longitude (lon)\",east,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433]],VERTCRS[\"FCSVR10_Height\",VDATUM[\"Fehmarnbelt_Vertical_Reference_2010\"],CS[vertical,1],AXIS[\"Gravity-related height (H)\",up,LENGTHUNIT[\"Meter\",1.0]]],ID[\"EPSG\",\"9519\"]]",
  "description": "FEH2010 + FCSVR10 height",
  "authority": "EPSG",
  "version": "10.013(13.2.0)",
  "deprecated": "no",
  "areaname": "Europe - Fehmarnbelt inner",
  "extent": {
    "slat": 54.42,
    "nlat": 54.76,
    "llon": 11.17,
    "rlon": 11.51
  }
}