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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)

Nerve, nerve root and plexus disorders (G50-G59)

Excludes 1:: current traumatic nerve, nerve root and plexus disorders - see Injury, nerve by body region
neuralgia NOS (M79.2)
neuritis NOS (M79.2)
peripheral neuritis in pregnancy (O26.82-)
radiculitis NOS (M54.1-)

G50

Disorders of trigeminal nerve [+]

Includes:

disorders of 5th cranial nerve

G51

Facial nerve disorders [+]

Includes:

disorders of 7th cranial nerve

G52

Disorders of other cranial nerves [+]

Excludes 2:

disorders of acoustic [8th] nerve (H93.3)
disorders of optic [2nd] nerve (H46, H47.0)
paralytic strabismus due to nerve palsy (H49.0-H49.2)

G53

Cranial nerve disorders in diseases classified elsewhere

Code first	underlying disease, such as: neoplasm (C00-D49)
Excludes 1:	multiple cranial nerve palsy in sarcoidosis (D86.82) multiple cranial nerve palsy in syphilis (A52.15) postherpetic geniculate ganglionitis (B02.21) postherpetic trigeminal neuralgia (B02.22)

G54

Nerve root and plexus disorders [+]

Excludes 1:

current traumatic nerve root and plexus disorders - see nerve injury by body region
intervertebral disc disorders (M50-M51)
neuralgia or neuritis NOS (M79.2)
neuritis or radiculitis brachial NOS (M54.13)
neuritis or radiculitis lumbar NOS (M54.16)
neuritis or radiculitis lumbosacral NOS (M54.17)
neuritis or radiculitis thoracic NOS (M54.14)
radiculitis NOS (M54.10)
radiculopathy NOS (M54.10)
spondylosis (M47.-)

G55

Nerve root and plexus compressions in diseases classified elsewhere

Code first	underlying disease, such as: neoplasm (C00-D49)
Excludes 1:	nerve root compression (due to) (in) ankylosing spondylitis (M45.-) nerve root compression (due to) (in) dorsopathies (M53.-, M54.-) nerve root compression (due to) (in) intervertebral disc disorders (M50.1.-, M51.1.-) nerve root compression (due to) (in) spondylopathies (M46.-, M48.-) nerve root compression (due to) (in) spondylosis (M47.0-, M47.2.-)

G56

Mononeuropathies of upper limb [+]

Excludes 1:

current traumatic nerve disorder - see nerve injury by body region

G56.0

Carpal tunnel syndrome [+]

G56.1

Other lesions of median nerve [+]

G56.2

Lesion of ulnar nerve [+]
Tardy ulnar nerve palsy

G56.3

Lesion of radial nerve [+]

G56.4

Causalgia of upper limb [+]
Complex regional pain syndrome II of upper limb

Excludes 1:

complex regional pain syndrome I of lower limb (G90.52-)
complex regional pain syndrome I of upper limb (G90.51-)
complex regional pain syndrome II of lower limb (G57.7-)
reflex sympathetic dystrophy of lower limb (G90.52-)
reflex sympathetic dystrophy of upper limb (G90.51-)

G56.8

Other specified mononeuropathies of upper limb [+]
Interdigital neuroma of upper limb

G56.9

Unspecified mononeuropathy of upper limb [+]

G57

Mononeuropathies of lower limb [+]

Excludes 1:

current traumatic nerve disorder - see nerve injury by body region

G57.0

Lesion of sciatic nerve [+]

Excludes 1:	sciatica NOS (M54.3-)
Excludes 2:	sciatica attributed to intervertebral disc disorder (M51.1.-)

G57.1

Meralgia paresthetica [+]
Lateral cutaneous nerve of thigh syndrome

G57.2

Lesion of femoral nerve [+]

G57.3

Lesion of lateral popliteal nerve [+]
Peroneal nerve palsy

G57.4

Lesion of medial popliteal nerve [+]

G57.5

Tarsal tunnel syndrome [+]

G57.6

Lesion of plantar nerve [+]
Morton's metatarsalgia

G57.7

Causalgia of lower limb [+]
Complex regional pain syndrome II of lower limb

Excludes 1:

complex regional pain syndrome I of lower limb (G90.52-)
complex regional pain syndrome I of upper limb (G90.51-)
complex regional pain syndrome II of upper limb (G56.4-)
reflex sympathetic dystrophy of lower limb (G90.52-)
reflex sympathetic dystrophy of upper limb (G90.51-)

G57.8

Other specified mononeuropathies of lower limb [+]
Interdigital neuroma of lower limb

G57.9

Unspecified mononeuropathy of lower limb [+]

G58

Other mononeuropathies [+]

G59

Mononeuropathy in diseases classified elsewhere

Code first	underlying disease
Excludes 1:	diabetic mononeuropathy (E08-E13 with .41) syphilitic nerve paralysis (A52.19) syphilitic neuritis (A52.15) tuberculous mononeuropathy (A17.83)