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)

Other disorders of the nervous system (G89-G99)

G89 Pain, not elsewhere classified [+]
Code also related psychological factors associated with pain (F45.42)
Excludes 1: generalized pain NOS (R52)
pain disorders exclusively related to psychological factors (F45.41)
pain NOS (R52)
Excludes 2: atypical face pain (G50.1)
headache syndromes (G44.-)
localized pain, unspecified type - code to pain by site, such as:
abdomen pain (R10.-)
back pain (M54.9)
breast pain (N64.4)
chest pain (R07.1-R07.9)
ear pain (H92.0-)
eye pain (H57.1)
headache (R51.9)
joint pain (M25.5-)
limb pain (M79.6-)
lumbar region pain (M54.5-)
painful urination (R30.9)
pelvic and perineal pain (R10.2)
shoulder pain (M25.51-)
spine pain (M54.-)
throat pain (R07.0)
tongue pain (K14.6)
tooth pain (K08.8)
renal colic (N23)
migraines (G43.-)
myalgia (M79.1-)
pain from prosthetic devices, implants, and grafts (T82.84, T83.84, T84.84, T85.84-)
phantom limb syndrome with pain (G54.6)
vulvar vestibulitis (N94.810)
vulvodynia (N94.81-)
G90 Disorders of autonomic nervous system [+]
Excludes 1: dysfunction of the autonomic nervous system due to alcohol (G31.2)
G91 Hydrocephalus [+]
Includes: acquired hydrocephalus
Excludes 1: Arnold-Chiari syndrome with hydrocephalus (Q07.-)
congenital hydrocephalus (Q03.-)
spina bifida with hydrocephalus (Q05.-)
G92 Toxic encephalopathy [+]
G93 Other disorders of brain [+]
G94 Other disorders of brain in diseases classified elsewhere
Code first underlying disease
Excludes 1: encephalopathy in congenital syphilis (A50.49)
encephalopathy in influenza (J09.X9, J10.81, J11.81)
encephalopathy in syphilis (A52.19)
hydrocephalus in diseases classified elsewhere (G91.4)
G95 Other and unspecified diseases of spinal cord [+]
Excludes 2: myelitis (G04.-)
G96 Other disorders of central nervous system [+]
G97 Intraoperative and postprocedural complications and disorders of nervous system, not elsewhere classified [+]
Excludes 2: intraoperative and postprocedural cerebrovascular infarction (I97.81-, I97.82-)
G98 Other disorders of nervous system not elsewhere classified [+]
Includes: nervous system disorder NOS
G99 Other disorders of nervous system in diseases classified elsewhere [+]

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