2027 ICD-10-CM Diagnosis Code G64Other disorders of peripheral nervous system
ICD-10-CM Codes›G00–G99›G60-G65›G64
- Billable — Valid for Submission
- Chronic Condition
G64 is a billable ICD-10-CM diagnosis code for other disorders of peripheral nervous system. 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 Other nervous system disorders (neither hereditary nor degenerative).
G64 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G64 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired demyelinating disorder of peripheral nerve
- Bacterial infection of peripheral nerve
- Delayed myelination
- Delayed myelination of peripheral nerve
- Dermatosis secondary to peripheral nerve disorder
- Diffuse demyelination of peripheral nerve
- Disorder of peripheral nervous system co-occurrent with human immunodeficiency virus infection
- Disorder of the peripheral nervous system
- Dysmyelination of peripheral nerve
- Dystonia due to disorder of peripheral nervous system
- EMILIN-1-related connective tissue disease
- Hypermyelination of peripheral nerve
- Hypomyelination of peripheral nerve
- Infection of peripheral nerve
- Neurological dysfunction due to obstetric fistula
- Neurotrophic damage to skin
- Parasitic infection of peripheral nerve
- Peripheral nerve disease
- Peripheral nerve disorder associated with repair of hernia
- Progressive symmetric demyelination of peripheral nerve
- Segmental demyelination and remyelination of peripheral nerve
- Segmental demyelination of peripheral nerve
- Skin damage resulting from acquired nerve disorder
- Structural abnormality of great auricular nerve
- Structural abnormality of lingual nerve
- Symmetric demyelination of peripheral nerve
- Viral infection of peripheral nerve
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G64: its own notes plus those printed at block G60-G65 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Disorder of peripheral nervous system NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- 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.
Disorder (of) See Also: Disease;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 G64 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G64Overview
What is the ICD-10 code for other disorders of peripheral nervous system?
The ICD-10-CM code for other disorders of peripheral nervous system is G64. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G64 (Other disorders of peripheral nervous system) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of peripheral nervous system on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G64 group to?
When other disorders of peripheral nervous system 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 G64 be reported with M79.2?
Not as a rule. The Excludes1 note at block G60-G65, which applies to G64, 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 G64?
Under the General Equivalence Mappings, other disorders of peripheral nervous system converts to ICD-9-CM 357.89 (inflam/tox neuropthy NEC). The mapping is approximate, so confirm the match fits the documentation.
Does G64 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: G64 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 (Polyneuropathy).
