Wiki What icd-10 code should be used in Hashimoto's encephalopathy (HE)

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Code: G04.81
Other encephalitis and encephalomyelitis
Noninfectious acute disseminated encephalomyelitis (noninfectious ADEM)
Parent Code Notes: G04.8
Code also: any associated seizure (G40.-, R56.9)
Parent Code Notes: G04
Excludes1: encephalopathy NOS (G93.40)
Excludes2: acute transverse myelitis (G37.3-)
alcoholic encephalopathy (G31.2)
benign myalgic encephalomyelitis (G93.3)
multiple sclerosis (G35)
subacute necrotizing myelitis (G37.4)
toxic encephalitis (G92)
toxic encephalopathy (G92)
Includes: acute ascending myelitis

Category Notes
Inflammatory diseases of the central nervous system (G00-G09)

Coding Guidelines
Diseases of the nervous system (G00-G99)
Excludes 2: certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)


Best answers
A patient has been diagnosed with Hashimoto's encephalopathy (HE) which is a very rare autoimmune syndrome. Can you help me with the icd-10 code for it?