2027 ICD-10-CM Diagnosis Code G52.9Cranial nerve disorder, unspecified

ICD-10-CM Codes›G00–G99›G50-G59›G52

ICD-10-CM G52.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

G52.9 is a billable ICD-10-CM diagnosis code for cranial nerve disorder, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nerve and nerve root disorders.

Code Identity

ICD-10-CM Code
G52.9
Billable Status
Yes — Valid for Submission
Code Describes
Cranial nerve disorder, unspecified
Short Description
Cranial nerve disorder, unspecified
Same as the full description in the CMS dataset.
Parent Code
G52
Disorders of other cranial nerves

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG50-G59Nerve, nerve root and plexus disorders
CategoryG52Disorders of other cranial nerves
This CodeG52.9Cranial nerve disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Combined hyperactive dysfunction syndrome of cranial nerves
  • Cranial nerve disorder
  • Cranial nerve palsy
  • Cranial nerve palsy due to diabetes mellitus
  • Cranial nerve palsy due to type 1 diabetes mellitus
  • Cranial neuralgia
  • Cranial neuritis
  • Cranial neuropathy due to micronutrient deficiency
  • Cranial neuropathy due to petrous infection
  • Cranial neuropathy due to sinusitis
  • Disorder of cranial nerve caused by ionizing radiation
  • Disorder of nerve due to type 1 diabetes mellitus
  • Fungal infection of cranial nerve
  • Fungal neuritis
  • Infection of cranial nerve caused by bacterium
  • Microvascular cranial nerve palsy
  • Neuropathy caused by ionizing radiation
  • Viral infection of cranial nerve

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to G52.9: its own notes plus those printed at G52, block G50-G59, and Chapter 6. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block G50-G59 Nerve, nerve root and plexus disorders applies to 106 codes
  • 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: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From G52 Disorders of other cranial nerves applies to 7 codes
  • 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)
From Chapter 6 (G00-G99) Diseases of the nervous system applies to 700 codes
  • 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)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS017
Nerve and nerve root disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Cranial Nerve Diseases

    disorders of one or more of the twelve cranial nerves. with the exception of the optic and olfactory nerves, this includes disorders of the brain stem nuclei from which the cranial nerves originate or terminate.

Patient EducationClinical

Peripheral Nerve Disorders

Nerves are like wires that carry messages back and forth between your brain and your body. Your peripheral nerves branch off from your brain and spinal cord and connect to all parts of your body, including your muscles and organs.

The full article covers:

  • What are peripheral nerves?
  • What are peripheral nerve disorders?
  • What causes peripheral nerve disorders?
  • What are the symptoms of peripheral nerve disorders?
  • How are peripheral nerve disorders diagnosed?
  • What are the treatments for peripheral nerve disorders?
  • Can peripheral nerve disorders be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G52.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
352.9 Cranial nerve dis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About G52.9Overview

What is the ICD-10 code for cranial nerve disorder, unspecified?

The ICD-10-CM code for cranial nerve disorder, unspecified is G52.9 (sometimes written as G529). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is G52.9 (Disorders of other cranial nerves) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report cranial nerve disorder, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does G52.9 group to?

When cranial nerve disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.

Can G52.9 be reported with M79.2?

Not as a rule. The Excludes1 note at block G50-G59, which applies to G52.9, lists "neuralgia NOS (M79.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of G52.9?

Under the General Equivalence Mappings, cranial nerve disorder, unspecified converts to ICD-9-CM 352.9 (cranial nerve dis NOS). The mapping is approximate, so confirm the match fits the documentation.