G52.9

Cranial nerve disorder, unspecified

FY2027Chapter 6: Diseases of the nervous system/G50–G59 Nerve, nerve root and plexus disorders

BillableComplete code, valid to report

Excludes1
Excludes2

G52.9 (also written G529) is a billable ICD-10-CM diagnosis code for cranial nerve disorder, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 7 codes in category G52 (Disorders of other cranial nerves). The Alphabetic Index lists it under 8 entries. Its coding notes include 5 Excludes1 entries and 11 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (5 notes)

Inherited from G50–G59 Nerve, nerve root and plexus disorders

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-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from G52 Disorders of other cranial nerves

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)

Also from chapter/block level (8 notes)

Inherited from Chapter 6 Diseases of the nervous system

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)

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 8 entries